ZMAX- azithromycin dihydrate powder, for suspension
Pfizer Laboratories Div Pfizer Inc
HIGHLIGHTS OF PRESCRIBING INFORMATION
These highlights do not include all the information needed to use ZMAX safely and effectively. See full prescribing information for ZMAX.
ZMAX® (azithromycin extended-release) for oral suspension
Initial U.S. Approval: 1991
RECENT MAJOR CHANGES
INDICATIONS AND USAGE
Zmax is a macrolide antimicrobial drug indicated for mild to moderate infections caused by designated, susceptible bacteria:
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Zmax and other antibacterial drugs, Zmax should be used only to treat infections that are proven or strongly suspected to be caused by susceptible bacteria
DOSAGE AND ADMINISTRATION
DOSAGE FORMS AND STRENGTHS
Bottle containing 2 g azithromycin for constitution with 60 mL of water (final concentration 27 mg/mL). (3)
WARNINGS AND PRECAUTIONS
To report SUSPECTED ADVERSE REACTIONS, contact Pfizer, Inc. at 1-800-438-1985 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch
USE IN SPECIFIC POPULATIONS
See 17 for PATIENT COUNSELING INFORMATION and FDA-approved patient labeling.
FULL PRESCRIBING INFORMATION: CONTENTS*
Zmax (azithromycin) is a macrolide antibacterial drug indicated for the treatment with mild to moderate infections caused by susceptible strains of the designated microorganisms in the specific conditions listed below. [See Clinical Studies (14)]
Acute bacterial sinusitis in adults due to Haemophilus influenzae, Moraxella catarrhalis or Streptococcus pneumoniae.
Community-acquired pneumonia in adults and pediatric patients six months of age or older due to Chlamydophila pneumoniae, Haemophilus influenzae, Mycoplasma pneumoniae or Streptococcus pneumoniae, in patients appropriate for oral therapy. Pediatric use in this indication is based on extrapolation of adult efficacy. [See Use in Specific Populations (8.4)]
Zmax is not recommended for use in patients with pneumonia who are judged to be inappropriate for oral therapy because of moderate to severe illness or risk factors such as any of the following:
To reduce the development of drug-resistant bacteria and maintain the effectiveness of Zmax (azithromycin) and other antibacterial drugs, Zmax (azithromycin) should be used only to treat infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.
Zmax should be taken as a single 2 g dose. Zmax provides a full course of antibacterial therapy in a single oral dose. It is recommended that Zmax be taken on an empty stomach (at least 1 hr before or 2 hr following a meal).
For pediatric patients 6 months and older, Zmax should be taken as a single dose of 60 mg/kg (equivalent to 27 mg/lb) body weight. The Zmax dose in mL is equivalent to the child's weight in lb (1 mL/lb dose, see Table 1 below), for a body weight of less than 75 lb (34 kg). It is recommended that Zmax be taken on an empty stomach (at least 1 hr before or 2 hrs following a meal).
Pediatric patients weighing 75 lb (34 kg) or more should receive the adult dose (2 g).
|Dosing Calculated on 1 mL/lb, Dose 1 mL of Suspension for every 1 lb of Body Weight for Children <75 lb (34 kg)*|
|Weight||1 mL/lb Dose|
|≥75||34||2000||Consume entire contents of bottle|
In the event that a patient vomits within 5 minutes of administration, the health care provider should consider additional antibiotic treatment since there would be minimal absorption of azithromycin. Since insufficient data exist on absorption of azithromycin if a patient vomits between 5 and 60 minutes following administration, alternative therapy should be considered. Neither a second dose of Zmax nor alternative treatment is warranted if vomiting occurs ≥60 minutes following administration, in patients with normal gastric emptying. In patients with delayed gastric emptying, alternative therapy should be considered.
Constitute with 60 mL of water and replace cap. Shake bottle well before dispensing. Do not refrigerate. Constituted suspension should be consumed within 12 hr.
For pediatric dosing in patients weighing less than 75 lb (34 kg), use of a dosing device is recommended. The pharmacist should inform the patient's caregiver that any suspension remaining after dosing MUST be discarded.
Each bottle of Zmax contains azithromycin dihydrate equivalent to 2 g of azithromycin. After constitution with 60 mL of water, each mL of suspension contains 27 mg of azithromycin. The suspension is a white or off-white color and has a cherry/banana flavor.
Zmax is contraindicated in patients with known hypersensitivity to azithromycin, erythromycin or any macrolide or ketolide drug.
If an allergic reaction occurs, appropriate therapy should be instituted. Physicians should be aware that reappearance of the allergic symptoms may occur when symptomatic therapy is discontinued.
Abnormal liver function, hepatitis, cholestatic jaundice, hepatic necrosis, and hepatic failure have been reported, some of which have resulted in death. Discontinue azithromycin immediately if signs and symptoms of hepatitis occur.
Prolonged cardiac repolarization and QT interval, imparting a risk of developing cardiac arrhythmia and torsades de pointes, have been seen in treatment with macrolides, including azithromycin. Cases of torsades de pointes have been spontaneously reported during postmarketing surveillance in patients receiving azithromycin. Providers should consider the risk of QT prolongation which can be fatal when weighing the risks and benefits of azithromycin for at-risk groups including:
Elderly patients may be more susceptible to drug-associated effects on the QT interval.
Clostridium difficile-associated diarrhea (CDAD) has been reported with use of nearly all antibacterial agents, including Zmax, and may range in severity from mild diarrhea to fatal colitis. Treatment with antibacterial agents alters the normal flora of the colon leading to overgrowth of C. difficile.
C. difficile produces toxins A and B which contribute to the development of CDAD. Hypertoxin producing strains of C. difficile cause increased morbidity and mortality, as these infections can be refractory to antimicrobial therapy and may require colectomy. CDAD must be considered in all patients who present with diarrhea following antibiotic use. Careful medical history is necessary since CDAD has been reported to occur over two months after the administration of antibacterial agents.
If CDAD is suspected or confirmed, ongoing antibiotic use not directed against C. difficile may need to be discontinued. Appropriate fluid and electrolyte management, protein supplementation, antibiotic treatment of C. difficile, and surgical evaluation should be instituted as clinically indicated.
Exacerbation of symptoms of myasthenia gravis and new onset of myasthenic syndrome have been reported in patients receiving azithromycin therapy.
A higher incidence of gastrointestinal adverse events (8 of 19 subjects) was observed when Zmax was administered to a limited number of subjects with GFR<10 mL/min. [See Use in Specific Populations (8.6)]
Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.
The data described below reflect exposure to Zmax in 728 adult patients. All patients received a single 2 g oral dose of Zmax. The population studied had community-acquired pneumonia and acute bacterial sinusitis.
In controlled clinical trials with Zmax, the majority of the reported treatment-related adverse reactions were gastrointestinal in nature and mild to moderate in severity.
Overall, the most common treatment-related adverse reactions in adult patients receiving a single 2 g dose of Zmax were diarrhea/loose stools (12%), nausea (4%), abdominal pain (3%), headache (1%), and vomiting (1%). The incidence of treatment-related gastrointestinal adverse reactions was 17% for Zmax and 10% for pooled comparators.
Treatment-related adverse reactions following Zmax treatment that occurred with a frequency of <1% included the following:
Cardiovascular: Palpitations, chest pain
Gastrointestinal: Constipation, dyspepsia, flatulence, gastritis, oral moniliasis
Nervous system: Dizziness, vertigo
Allergic: Rash, pruritus, urticaria
Special senses: Taste perversion
The data described below reflect exposure to Zmax in 907 pediatric patients. The population was 3 months to 12 years of age. All patients received a single 60 mg/kg oral dose of Zmax.
As in adults, the most common treatment-related adverse reactions in pediatric subjects were gastrointestinal in nature. The pediatric subjects all received a single 60 mg/kg dose (equivalent to 27 mg/lb) of Zmax.
In a trial with 450 pediatric subjects (ages 3 months to 48 months), vomiting (11%), diarrhea (10%) loose stools (9%), and abdominal pain (2%) were the most frequently reported treatment-related gastrointestinal adverse reactions. Many treatment related gastrointestinal adverse reactions with an incidence greater than 1% began on the day of dosing in these subjects [43% (68/160)] and most [53% (84/160)] resolved within 48 hr of onset. Treatment-related adverse events that were not gastrointestinal, occurring with a frequency ≥ 1% were: rash (5%), anorexia (2%), fever (2%), and dermatitis (2%).
In a second trial of 337 pediatric subjects, ages 2 years to 12 years, the most frequently reported treatment-related adverse reactions also included vomiting (14%), diarrhea (7%), loose stools (2%), nausea (4%) and abdominal pain (4%).
A third trial investigated the tolerability of two different concentrations of azithromycin oral suspension in 120 pediatric subjects (ages 3 months to 48 months), all of whom were treated with azithromycin. The study evaluated the hypothesis that a more dilute, less viscous formulation (the recommended 27 mg/mL concentration of Zmax) is less likely to induce vomiting in young children than a more concentrated suspension used in other pediatric studies. The vomiting rate for subjects taking the dilute concentration azithromycin was 3% (2/61). The rate was numerically lower but not statistically different from the vomiting for the more concentrated suspension Across both treatment arms, the only treatment-related adverse events with a frequency of ≥ 1% were vomiting (6%, 7/120) and diarrhea (2%, 2/120).
Treatment-related adverse reactions with a frequency of < 1% following Zmax treatment in all 907 pediatric subjects in the Phase 3 studies were:
Body as a whole: Chills, fever, flu syndrome, headache;
Digestive: Abnormal stools, constipation, dyspepsia, flatulence, gastritis, gastrointestinal disorder, hepatitis;
Hematologic and lymphatic: Leukopenia;
Nervous system: Agitation, emotional liability, hostility, hyperkinesia, insomnia, irritability, paresthesia, Somnolence;
Respiratory: Asthma, bronchitis, cough, dyspnea, pharyngitis, rhinitis;
Skin and appendages: Dermatitis, fungal dermatitis, maculopapular rash, pruritus, urticaria;
Special senses: Otitis media, taste perversion;
Because these reactions are reported voluntarily from a population of uncertain size, reliably estimating their frequency or establishing a causal relationship to drug exposure is not always possible.
Adverse events reported with azithromycin immediate release formulations during the postmarketing period for which a causal relationship may not be established include:
Allergic: Arthralgia, edema, urticaria and angioedema
Cardiovascular: Palpitations and arrhythmias including ventricular tachycardia and hypotension
There have been reports of QT prolongation and torsades de pointes.
Gastrointestinal: Anorexia, constipation, dyspepsia, flatulence, vomiting/diarrhea, pseudomembranous colitis, pancreatitis, oral candidiasis, pyloric stenosis, and rare reports of tongue discoloration
General: Asthenia, paresthesia, fatigue, malaise and anaphylaxis
Genitourinary: Interstitial nephritis, acute renal failure and vaginitis
Hematopoietic: Thrombocytopenia, mild neutropenia
Liver/biliary: Adverse reactions related to hepatic dysfunction have been reported in postmarketing experience with azithromycin. [See Warnings and Precautions (5.2)]
Nervous system: Convulsions, dizziness/vertigo, headache, somnolence, hyperactivity, nervousness, agitation and syncope
Psychiatric: Aggressive reaction and anxiety
Skin/appendages: Pruritus, rash, photosensitivity, serious skin reactions including erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis, and DRESS.
Special senses: Hearing disturbances including hearing loss, deafness and/or tinnitus and reports of taste/smell perversion and/or loss
In subjects with normal baseline values, the following clinically significant laboratory abnormalities (irrespective of drug relationship) were reported in Zmax clinical trials in adults and pediatric patients:
Laboratory abnormalities with an incidence of greater than or equal to 1%: reduced lymphocytes and increased eosinophils; reduced bicarbonate. Laboratory abnormalities with an incidence of less than 1%: leukopenia, neutropenia, elevated bilirubin, AST, ALT, BUN, creatinine, alterations in potassium. Where follow-up was provided, changes in laboratory tests appeared to be reversible.
Laboratory abnormalities with an incidence of greater than or equal to 1%: elevated eosinophils, BUN, and potassium; decreased lymphocytes; and alterations in neutrophils; with an incidence of less than 1%: elevated SGOT, SGPT and creatinine; decreased potassium; and alterations in sodium and glucose.
Co-administration of nelfinavir at steady-state with a single oral dose of azithromycin resulted in increased azithromycin serum concentrations. Although a dose adjustment of azithromycin is not recommended when administered in combination with nelfinavir, close monitoring for known adverse reactions of azithromycin, such as liver enzyme abnormalities and hearing impairment, is warranted. [see Adverse Reactions (6)]
Spontaneous post-marketing reports suggest that concomitant administration of azithromycin may potentiate the effects of oral anticoagulants such as warfarin, although the prothrombin time was not affected in the dedicated drug interaction study with azithromycin and warfarin. Prothrombin times should be carefully monitored while patients are receiving azithromycin and oral anticoagulants concomitantly.
Interactions with digoxin or phenytoin have not been reported in clinical trials with azithromycin; however, no specific drug interaction studies have been performed to evaluate potential drug-drug interactions. However, drug interactions have been observed with other macrolide products. Until further data are developed regarding drug interactions when digoxin or phenytoin are used concomitantly with azithromycin careful monitoring of patients is advised.
Teratogenic Effects. Pregnancy Category B: Reproduction studies have been performed in rats and mice at doses up to moderately maternally toxic dose concentrations (i.e., 200 mg/kg/day). These daily doses in rats and mice, based on body surface area, are estimated to be approximately equivalent to one or one-half of, respectively, the single adult oral dose of 2 g. In the animal studies, no evidence of harm to the fetus due to azithromycin was found. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, azithromycin should be used during pregnancy only if clearly needed.
Azithromycin has been reported to be excreted in human breast milk in small amounts. Caution should be exercised when azithromycin is administered to a nursing woman.
Safety and effectiveness in the treatment of pediatric patients under 6 months of age have not been established.
Community-Acquired Pneumonia: The safety and effectiveness of Zmax have been established in pediatric patients 6 months of age or older with community-acquired pneumonia due to Chlamydophila pneumoniae, Mycoplasma pneumoniae, Haemophilus influenzae or Streptococcus pneumoniae. Use of Zmax for these patients is supported by evidence from adequate and well-controlled studies of Zmax in adults with additional safety and pharmacokinetic data in pediatric patients. [See Dosage and Administration (2.2), Adverse reactions (6), Clinical Pharmacology (12.3)]
Data collected from the azithromycin capsule and tablet formulations indicate that a dosage adjustment does not appear to be necessary for older patients with normal renal function (for their age) and hepatic function receiving treatment with Zmax.
In clinical trials of Zmax, 17% of subjects were at least 65 years of age (214/1292) and 5% of subjects (59/1292) were at least 75 years of age. No overall differences in safety or effectiveness were observed between these subjects and younger subjects. Elderly patients may be more susceptible to development of torsades de pointes arrhythmia than younger patients. [See Warnings and Precautions (5.3)]
No dosage adjustment is recommended for patients GFR >10 mL/min. Caution should be exercised when Zmax is administered to patients with GFR <10 mL/min, due to a higher incidence of gastrointestinal adverse events (8 of 19 subjects) observed in a limited number of subjects with GFR <10 mL/min. [See Clinical Pharmacology (12)]
The impact of gender on the pharmacokinetics of azithromycin has not been evaluated for Zmax. However, previous studies have demonstrated no significant differences in the disposition of azithromycin between male and female subjects. No dosage adjustment of Zmax is recommended based on gender.
Adverse reactions experienced at higher than recommended doses were similar to those seen at normal doses. In the event of overdosage, general symptomatic and supportive measures are indicated as required.
Zmax (azithromycin extended-release) for oral suspension contains the active ingredient azithromycin (as azithromycin dihydrate), an azalide, a subclass of macrolide antibacterial drug. Azithromycin has the chemical name (2R,3S,4R,5R,8R,10R,11R,12S,13S,14R)13-[(2,6-Dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexopyranosyl) oxy]-2-ethyl-3,4,10-trihydroxy-3,5,6,8,10,12,14-heptamethyl-11-[[3,4,6-trideoxy-3- (dimethylamino)-β-D-xylo-hexopyranosyl]oxy]-1-oxa-6-azacyclopentadecan-15-one. Azithromycin is derived from erythromycin; however, it differs chemically from erythromycin in that a methyl-substituted nitrogen atom is incorporated into the lactone ring. Its molecular formula is C38H72N2O12, and its molecular weight is 749.0. Azithromycin has the following structural formula:
Azithromycin, as the dihydrate, is a white crystalline powder with a molecular formula of C38H72N2O12∙2H2O and a molecular weight of 785.0.
Zmax is a single-dose, extended-release formulation of microspheres for oral suspension containing azithromycin (as azithromycin dihydrate) and the following excipients: glyceryl behenate, poloxamer 407, sucrose, sodium phosphate tribasic anhydrous, magnesium hydroxide, hydroxypropyl cellulose, xanthan gum, colloidal silicon dioxide, titanium dioxide, artificial cherry flavor, and artificial banana flavor.
Note: Each bottle of Zmax 2 g for oral suspension contains approximately 148 mg of sodium and 19 g of sucrose. Constituted Zmax oral suspension contains approximately 2 mg/mL of sodium and 0.26 g/mL of sucrose.
Azithromycin is a macrolide antibacterial drug. [See Clinical Pharmacology (12.4)]
QTc interval prolongation was studied in a randomized, placebo-controlled parallel trial in 116 healthy subjects who received either chloroquine (1000 mg) alone or in combination with azithromycin (500 mg, 1000 mg, and 1500 mg once daily). Co-administration of azithromycin increased the QTc interval in a dose- and concentration-dependent manner. In comparison to chloroquine alone, the maximum mean (95% upper confidence bound) increases in QTcF were 5 (10) ms, 7 (12) ms and 9 (14) ms with the co-administration of 500 mg, 1000 mg and 1500 mg azithromycin, respectively.
Zmax is an extended-release microsphere formulation. Based on data obtained from studies evaluating the pharmacokinetics of azithromycin in healthy adult subjects a higher peak serum concentration (Cmax) and greater systemic exposure (AUC 0–24) of azithromycin are achieved on the day of dosing following a single 2 g dose of Zmax versus 1.5 g of azithromycin tablets administered over 3 days (500 mg/day) or 5 days (500 mg on day 1, 250 mg/day on days 2–5) [Table 2]. Consequently, due to these different pharmacokinetic profiles, Zmax is not interchangeable with azithromycin tablet 3-day and 5-day dosing regimens.
|Pharmacokinetic Parameter*||Azithromycin Regimen|
|SD = standard deviation|
Cmax = maximum serum concentration
Tmax = time to Cmax
AUC = area under concentration vs. time curve
t1/2 = terminal serum half-life
|¶ Total AUC for the 1-day, 3-day and 5-day regimens|
The bioavailability of Zmax relative to azithromycin immediate release (IR) (powder for oral suspension) was 83%. On average, peak serum concentrations were achieved approximately 2.5 hr later following Zmax administration and were lower by 57%, compared to 2 g azithromycin IR. Thus, single 2 g doses of Zmax and azithromycin IR are not bioequivalent and are not interchangeable.
Effect of food on absorption: A high-fat meal increased the rate and extent of absorption of a 2 g dose of Zmax (115% increase in Cmax, and 23% increase in AUC0–72) compared to the fasted state. A standard meal also increased the rate of absorption (119% increase in Cmax) and with less effect on the extent of absorption (12% increase in AUC0–72) compared to administration of a 2 g Zmax dose in the fasted state.
Effect of antacids: Following the administration of Zmax with an aluminum and magnesium hydroxide antacid, the rate and extent of azithromycin absorption were not altered.
The serum protein binding of azithromycin is concentration dependent, decreasing from 51% at 0.02 mcg/mL to 7% at 2 mcg/mL. Following oral administration, azithromycin is widely distributed throughout the body with an apparent steady-state volume of distribution of 31.1 L/kg.
Azithromycin concentrates in fibroblasts, epithelial cells, macrophages, and circulating neutrophils and monocytes. Higher azithromycin concentrations in tissues than in plasma or serum have been observed. White blood cell and lung exposure data in humans following a single 2 g dose of Zmax in adults are shown in Table 3. Following a 2 g single dose of Zmax, azithromycin achieved higher exposure (AUC0–120) in mononuclear leukocytes (MNL) and polymorphonuclear leukocytes (PMNL) than in serum. The azithromycin exposure (AUC0–72) in lung tissue and alveolar cells (AC) was approximately 100 times that in serum; and the exposure in epithelial lining fluid (ELF) was also higher (approximately 2–3 times) than in serum. The clinical significance of this distribution data is unknown.
|A single 2 g dose of Zmax|
|Abbreviation: WBC: white blood cells; MNL: mononuclear leukocytes; PMNL: polymorphonuclear leukocytes; ELF: Epithelial lining fluid|
|WBC||Cmax (mcg/mL)||AUC0–24 (mcg∙hr/mL)||AUC0–120 (mcg∙hr/mL)||Ct=120* (mcg/mL)|
|MNL†||116 (40.2)||1790 (540)||4710 (1100)||16.2 (5.51)|
|PMNL†||146 (66.0)||2080 (650)||10000 (2690)||81.7 (23.3)|
|LUNG||Cmax (mcg/mL)||AUC0–24 (mcg∙hr/mL)||AUC0–72 (mcg∙hr/mL)|
|Cmax (mcg/g)||AUC0–24 (mcg∙hr/g)||AUC0–72 (mcg∙hr/g)|
Following a regimen of 500 mg of azithromycin tablets on the first day and 250 mg daily for 4 days, only very low concentrations were noted in cerebrospinal fluid (less than 0.01 mcg/mL) in the presence of non-inflamed meninges.
In vitro and in vivo studies to assess the metabolism of azithromycin have not been performed.
Serum azithromycin concentrations following a single 2 g dose of Zmax declined in a polyphasic pattern with a terminal elimination half-life of 59 hr. The prolonged terminal half-life is thought to be due to a large apparent volume of distribution.
Biliary excretion of azithromycin, predominantly as unchanged drug, is a major route of elimination. Over the course of a week, approximately 6% of the administered dose appears as unchanged drug in urine.
Azithromycin pharmacokinetics were investigated in 42 adults (21 to 85 years of age) with varying degrees of renal impairment. Following the oral administration of a single 1.0 g dose of azithromycin (4 × 250 mg capsules), the mean Cmax and AUC0–120 were 5.1% and 4.2% higher, respectively in subjects with GFR 10 to 80 mL/min compared to subjects with normal renal function (GFR >80 mL/min). The mean Cmax and AUC0–120 were 61% and 35% higher, respectively in subjects with GFR <10 mL/min compared to subjects with normal renal function. [See Use in Specific Populations Renal Impairment (8.6)]
The pharmacokinetics of azithromycin in subjects with hepatic impairment has not been established.
The pharmacokinetics of azithromycin were characterized following a single 60 mg/kg dose of Zmax in pediatric patients aged 3 months to 16 years. Although there was high inter-patient variability in systemic exposure (AUC and Cmax) across the age groups studied, individual azithromycin AUC and Cmax values in pediatric patients were comparable to or higher than those following administration of 2 g Zmax in adults (Table 4). [See Use in Specific Populations (8.4)]
|Treatment Group||Pharmacokinetic Parameters|
|Empty stomach = dosed with Zmax at least 1 hr before or 2 hr after a meal (Groups I–VI)|
Fed = dosed with Zmax within 5 minutes of consuming an age-appropriate high-fat breakfast (Group VII)
|Group 1 (N = 6)|
[3 to 18 months]
|0.74 (0.20)||3 (3–3)||6.29 (1.17)||14.1 (2.16)|
(n = 3)
|Group 2† (N = 6)|
[>18 to 36 months]
|1.88† (0.50)||3 (3–3)||19.7† (5.35)||37.3 (12.9)|
(n = 5)
|Group 3 (N = 6)|
[>36 to 48 months]
|1.23 (0.42)||3 (3–6)||12.9 (3.79)||22.4 (5.96)|
|Group 4 (N = 6)|
[>48 months to 8 years]
|1.13 (0.34)||3 (3–6)||13.0 (4.21)||22.2 (6.89)|
|Group 5 (N = 6)|
[>8 to 12 years]
|1.65 (0.38)||3 (3–6)||16.0 (4.99)||30.1 (10.7)|
|Group 6 (N = 6)|
[>12 to 16 years]
|0.98 (0.35)||3 (3–6)||11.0 (4.78)||21.3 (9.37)|
|Pooled 1–6 (N = 36)|
[On an empty stomach]
|1.27 (0.53)||3 (3–6)||13.1 (5.78)||25.2 (10.7)|
(n = 32)
|Group 7‡ (N = 7)|
[Fed; 18 months to 8 years]
|1.41 (0.62)||3 (1.5–3.1)||7.43 (3.00)||18.9 (3.57)|
(n = 3)
Pharmacokinetic Interaction Studies
A drug interaction study was performed with Zmax and antacids. All other drug interaction studies were performed with azithromycin immediate release (IR) formulations (capsules and tablets, doses ranging from 500 to 1200 mg) and other drugs likely to be co-administered. The effects of co-administration of azithromycin on the pharmacokinetics of other drugs are shown in Table 5 and the effects of other drugs on the pharmacokinetics of azithromycin are shown in Table 6.
When used at therapeutic doses, azithromycin IR had a minimal effect on the pharmacokinetics of atorvastatin, carbamazepine, cetirizine, didanosine, efavirenz, fluconazole, indinavir, midazolam, nelfinavir, sildenafil, theophylline (intravenous and oral), triazolam, trimethoprim/sulfamethoxazole or zidovudine (Table 5). Although the drug interaction studies were not conducted with Zmax, similar modest effect as observed with IR formulation are expected since the total exposure to azithromycin is comparable for Zmax and other azithromycin IR regimens. Therefore, no dosage adjustment of drugs listed in Table 5 is recommended when co-administered with Zmax.
Nelfinavir significantly increased the Cmax and AUC of azithromycin following co-administration with azithromycin IR 1200 mg (Table 6). However, no dose adjustment of azithromycin is recommended when Zmax is co-administered with nelfinavir.
Pharmacokinetic and/or pharmacodynamic interactions with the drugs listed below have not been reported in clinical trials with azithromycin; however, no specific drug interaction studies have been performed to evaluate potential drug-drug interaction. Nonetheless, pharmacokinetic and/or pharmacodynamic interactions with these drugs have been observed with other macrolide products. Until further data are developed, careful monitoring of patients is advised when azithromycin and these drugs are used concomitantly: digoxin, ergotamine or dihydroergotamine, cyclosporine, hexobarbital and phenytoin.
|Co-administered Drug||Dose of Co-administered Drug||Dose of Azithromycin*||n||Ratio (with/without Azithromycin) of Co-administered Drug Pharmacokinetic Parameters (90% CI); No Effect = 1.00|
|Mean Cmax||Mean AUC|
|Atorvastatin||10 mg/day for 8 days||500 mg/day orally on days 6–8||12||0.83|
(0.63 to 1.08)
(0.81 to 1.25)
|Carbamazepine||200 mg/day for 2 days, then 200 mg twice a day for 18 days||500 mg/day orally for days 16–18||7||0.97|
(0.88 to 1.06)
(0.88 to 1.06)
|Cetirizine||20 mg/day for 11 days||500 mg orally on day 7, then 250 mg/day on days 8–11||14||1.03|
(0.93 to 1.14)
(0.92 to 1.13)
|Didanosine||200 mg orally twice a day for 21 days||1,200 mg/day orally on days 8–21||6||1.44|
(0.85 to 2.43)
(0.83 to 1.57)
|Efavirenz||400 mg/day for 7 days||600 mg orally on day 7||14||1.04†||0.95†|
|Fluconazole||200 mg orally single dose||1,200 mg orally single dose||18||1.04|
(0.98 to 1.11)
(0.97 to 1.05)
|Indinavir||800 mg three times a day for 5 days||1,200 mg orally on day 5||18||0.96|
(0.86 to 1.08)
(0.81 to 1.00)
|Midazolam||15 mg orally on day 3||500 mg/day orally for 3 days||12||1.27|
(0.89 to 1.81)
(1.01 to 1.56)
|Nelfinavir||750 mg three times a day for 11 days||1,200 mg orally on day 9||14||0.90|
(0.81 to 1.01)
(0.78 to 0.93)
|Sildenafil||100 mg on days 1 and 4||500 mg/day orally for 3 days||12||1.16|
(0.86 to 1.57)
(0.75 to 1.12)
|Theophylline||4 mg/kg IV on days 1, 11, 25||500 mg orally on day 7, then 250 mg/day on days 8–11||10||1.19|
(1.02 to 1.40)
(0.86 to 1.22)
|Theophylline||300 mg orally twice a day for 15 days||500 mg orally on day 6, then 250 mg/day on days 7–10||8||1.09|
(0.92 to 1.29)
(0.89 to 1.31)
|Triazolam||0.125 mg on day 2||500 mg orally on day 1, then 250 mg/day on day 2||12||1.06†||1.02†|
|160 mg/800 mg/day orally for 7 days||1,200 mg orally on day 7||12||0.85|
(0.75 to 0.97)/
(0.78 to 1.03)
(0.80 to 0.95)/
(0.88 to 1.03)
|Zidovudine||500 mg/day orally for 21 days||600 mg/day oraly for 14 days||5||1.12|
(0.42 to 3.02)
(0.52 to 1.70)
|Zidovudine||500 mg/day orally for 21 days||1,200 mg/day orally for 14 days||4||1.31|
(0.43 to 3.97)
(0.69 to 2.43)
|Co-administered Drug||Dose of Co-administered Drug||Dose of Azithromycin*||n||Ratio (with/without co-administered drug) of Azithromycin Pharmacokinetic Parameters (90% CI); No Effect = 1.00|
|Mean Cmax||Mean AUC|
|Efavirenz||400 mg/day for 7 days||600 mg orally on day 7||14||1.22|
(1.04 to 1.42)
|Fluconazole||200 mg orally single dose||1,200 mg orally single dose||18||0.82|
(0.66 to 1.02)
(0.94 to 1.22)
|Nelfinavir||750 mg three times a day 11 days||1,200 mg orally on day 9||14||2.36|
(1.77 to 3.15)
(1.80 to 2.50)
|Aluminum and Magnesium hydroxide||20 mL regular strength, single dose||2 g Zmax, single dose||39||0.99|
(0.93 to 1.06)
(0.92 to 1.08)
Mechanism of Action
Azithromycin binds to the 23S rRNA of the 50S ribosomal subunit and interferes with bacterial protein synthesis by impeding the assembly of the 50S ribosomal subunit.
Azithromycin demonstrates cross resistance with erythromycin. The most frequently encountered mechanism of resistance to azithromycin is modification of the 23S rRNA target, most often by methylation. Ribosomal modifications can determine cross resistance to other macrolides, lincosamides and streptogramin B (MLSB phenotype).
Azithromycin has been shown to be active against the following microorganisms, both in vitro and in clinical infections. [See Indications and Usage (1)].
Susceptibility Testing Methods
When available, the clinical microbiology laboratory should provide the results of in vitro susceptibility test results for antimicrobial products used in resident hospitals to the physician as periodic reports that describe the susceptibility profile of nosocomial and community-acquired pathogens. These reports should aid the physician in selecting an antibacterial drug product for treatment.
Quantitative methods are used to determine minimal inhibitory concentrations (MICs). These MICs provide estimates of the susceptibility of bacteria to antimicrobial compounds. The MICs should be determined using a standardized test method 1,3,4 (broth or agar). The MIC values should be interpreted according to criteria provided in Table 7.
Quantitative methods that require measurement of zone diameters can provide reproducible estimates of the susceptibility of bacteria to antimicrobial compounds. The zone size provides an estimate of the susceptibility of bacteria to antimicrobial compounds. The zone size should be determined using a standardized method 2,3,4. This procedure uses paper disk impregnated with 15 mcg azithromycin to test the susceptibility of bacteria to azithromycin. The disk diffusion interpretive criteria are provided in Table 7.
(zone diameter in mm)
A report of "Susceptible" (S) indicates that the antimicrobial drug is likely to inhibit growth of the pathogen if the antimicrobial drug reaches the concentration at the site of infection. A report of "Intermediate" (I) indicates that the result should be considered equivocal, and if the microorganism is not fully susceptible to alternative clinically feasible drugs, the test should be repeated. This category implies possible clinical applicability in body sites where the drug is physiologically concentrated. This category also provides a buffer zone that prevents small uncontrolled technical factors from causing major discrepancies in interpretation. A report of "Resistant" (R) indicates that the antimicrobial drug is not likely to inhibit growth of the pathogen if the antimicrobial drug reaches the concentrations usually achievable at the infection site; other therapy should be selected.
Standardized susceptibility test procedures require the use of laboratory controls to monitor and ensure the accuracy and precision of supplies and reagents used in the assay, and the techniques of the individuals performing the test 1,2,3,4. Standard azithromycin powder should provide the following range of MIC values provided in Table 8. For the diffusion technique using the 15-mcg azithromycin disk the criteria provided in Table 8 should be achieved.
|Quality Control Organism||Minimum Inhibitory|
(zone diameters in mm)
|ATCC = American Type Culture Collection|
Long-term studies in animals have not been performed to evaluate carcinogenic potential. Azithromycin has shown no mutagenic potential in standard laboratory tests: mouse lymphoma assay, human lymphocyte clastogenic assay, and mouse bone marrow clastogenic assay. No evidence of impaired fertility due to azithromycin was found in rats given daily doses up to 10 mg/kg (approximately 0.05 times the single 2 g oral adult human dose based on body surface area).
Phospholipidosis (intracellular phospholipid accumulation) has been observed in some tissues of mice, rats, and dogs given multiple doses of azithromycin. It has been demonstrated in numerous organ systems (e.g., eye, dorsal root ganglia, liver, gallbladder, kidney, spleen, and/or pancreas) in dogs treated with azithromycin at doses which, expressed on the basis of mg/m2, are approximately one-sixth the recommended adult dose, and in rats treated at doses approximately one-fourth the recommended adult dose. This effect has been shown to be reversible after cessation of azithromycin treatment. Based on the pharmacokinetic data, phospholipidosis has been seen in the rat (50 mg/kg/day dose) at the observed maximal plasma concentration of 1.3 mcg/mL (1.6 times the observed Cmax of 0.821 mcg/mL at the adult dose of 2 g.). Similarly, it has been shown in the dog (10 mg/kg/day dose) at the observed maximal serum concentration of 1 mcg/mL (1.2 times the observed Cmax of 0.821 mcg/mL at the adult dose of 2 g).
Phospholipidosis was also observed in neonatal rats dosed for 18 days at 30 mg/kg/day, which is less than the pediatric dose of 60 mg/kgbased on the surface area. It was not observed in neonatal rats treated for 10 days at 40 mg/kg/day with mean maximal serum concentrations of 1.86 mcg/mL, approximately 1.5 times the Cmax of 1.27 mcg/mL at the pediatric dose. Phospholipidosis has been observed in neonatal dogs (10 mg/kg/day) at maximum mean whole blood concentrations of 3.54 mcg/mL, approximately 3 times the pediatric dose Cmax.
The significance of the finding for animals and for humans is unknown.
Adult subjects with a diagnosis of acute bacterial maxillary sinusitis were evaluated in a randomized, double-blind, multicenter study; a maxillary sinus tap was performed on all subjects at baseline. Clinical evaluations were conducted for all subjects at the TOC visit, 7 to 14 days post-treatment. Two hundred seventy (270) subjects were treated with a single 2 g oral dose of Zmax and 268 subjects were treated with levofloxacin, 500 mg orally once daily for 10 days. A subject was considered a cure if signs and symptoms related to the acute infection had resolved, or if clinical improvement was such that no additional antibiotics were deemed necessary. The clinical response for the primary population, Clinical Per Protocol Subjects, is presented below.
|RESPONSE AT TOC||N = 255||N = 254|
|CURE||241 (94.5%)||236 (92.9%)|
|FAILURE||14 (5.5%)||18 (7.1%)|
Clinical response by pathogen in the Bacteriologic Per Protocol population is presented below.
|S. pneumoniae||37||36 (97.3%)||39||36 (92.3%)|
|H. influenzae||27||26 (96.3%)||30||30 (100.0%)|
|M. catarrhalis||8||8 (100.0%)||11||10 (90.9%)|
Adult subjects with a diagnosis of mild-to-moderate community-acquired pneumonia were evaluated in two, randomized, double-blind, multicenter studies. In both studies, clinical and microbiologic evaluations were conducted for all subjects at the Test of Cure (TOC) visit, 7 to 14 days post-treatment. In Trial 1, 247 subjects were treated with a single 2 g oral dose of Zmax and 252 subjects were treated with clarithromycin extended-release, 1 g orally once daily for 7 days. In Trial 2, 211 subjects were treated with a single 2.0 g oral dose of Zmax and 212 subjects were treated with levofloxacin, 500 mg orally once daily for 7 days. A patient was considered a cure if signs and symptoms related to the acute infection had resolved, or if clinical improvement was such that no additional antibiotics were deemed necessary; in addition, the chest x-ray performed at the TOC visit was to be either improved or stable. The clinical response at TOC for the primary population, Clinical Per Protocol Subjects, is presented in the table below.
|Zmax vs. Clarithromycin extended-release||N=202||N=209|
|Cure||187 (92.6%)||198 (94.7%)|
|Failure||15 (7.4%)||11 (5.3%)|
|Zmax vs. Levofloxacin||N=174||N=189|
|Cure||156 (89.7%)||177 (93.7%)|
|Failure||18 (10.3%)||12 (6.3%)|
Clinical response by pathogen in the Bacteriologic Per Protocol population, across both studies, is presented below:
|S. pneumoniae||33||28 (84.8%)||39||35 (89.7%)|
|H. influenzae||30||28 (93.3%)||34||31 (91.2%)|
|C. pneumoniae||40||37 (92.5%)||53||50 (94.3%)|
|M. pneumoniae||33||30 (90.9%)||39||38 (97.4%)|
NDC 0069-4170-34 for combined adult and pediatric use is supplied in bottles containing 2 g of azithromycin and should be constituted with 60 mL of water.
Before constitution, store dry powder at or below 30°C (86°F).
After constitution, store suspension at 25°C (77°F); excursions permitted to 15–30°C (59–86°F) [see USP Controlled Room Temperature]. Do not refrigerate or freeze.
Constituted suspension should be consumed within 12 hr. For adult patients, the entire bottle should be consumed. For pediatric patients, any suspension remaining after dosing MUST be discarded.
General Patient Counseling
Patients should be counseled that antibacterial drugs including Zmax should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold). Not taking the complete prescribed dose may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Zmax or other antibacterial drugs in the future.
This product's label may have been updated. For current full prescribing information, please visit www.pfizer.com
Zmax® (azithromycin extended release)
Read the Patient Information that comes with Zmax® carefully before you or your child take it. This leaflet does not take the place of talking with your doctor about you or your child's medical condition or treatment. Only your doctor can decide if Zmax is right for you or your child.
What is Zmax?
Zmax is an antibiotic that kills certain bacteria. Zmax is dosed differently from other antibiotics.
You take just one dose, one time.
Zmax is used in adults and in children over the age of 6 months against bacteria to treat certain kinds of pneumonia (lung infections)
Zmax is used in adults against bacteria to treat sinus infections.
Zmax only works against bacteria. It does not work against viruses, like the common cold or flu.
Zmax has not been studied in children under 6 months of age.
Who should not take Zmax?
Talk with your doctor or pharmacist if you have questions about your medicine allergies.
Before you start Zmax
Tell your doctor about all your or your child's medical problems including if you or your child:
Tell your doctor about all the medicines you take, including prescription and non-prescription medicines, vitamins and herbal supplements. Especially tell your doctor if you or your child are taking warfarin (Coumadin®, Jantoven)
Know the medicines you take. Keep a list of your medicines and show it to your doctor or pharmacist when you get a new prescription.
Do I need to prepare Zmax?
How do I take Zmax?
How will I know Zmax is working?
Zmax needs time to work, so you or your child may not feel better right away. If you or your child's symptoms do not get better in a few days, call your doctor.
What are the possible side effects of Zmax?
Zmax may cause serious side effects. These happened in a small number of patients. Call your doctor right away or get emergency treatment if you or your child have any of the following:
These symptoms could go away and then come back.
The most common side effects in adults are:
The most common side effects in children are:
Tell your doctor if you have any side effects that bother your or your child, or that does not go away.
These are not all of the possible side effects with Zmax. For a list of all reported side effects, ask your doctor or pharmacist.
General information about Zmax
Doctors sometimes prescribe medicines for conditions that are not in the patient leaflets. Do not use Zmax for anything other than what your doctor prescribed. Do not give it to other people, even if they have the same symptoms you have. It may harm them.
This Patient Information leaflet is a summary of the most important information about Zmax. For more information, talk with your doctor. You can ask your doctor or pharmacist for information about Zmax that is written for healthcare professionals. For more information, go to our website at www.zmaxinfo.com or call 1-800-438-1985.
What is in Zmax?
Active ingredient: azithromycin dihydrate
Inactive ingredients: glyceryl behenate, poloxamer 407, sucrose, sodium phosphate tribasic anhydrous, magnesium hydroxide, hydroxypropyl cellulose, xanthan gum, colloidal silicon dioxide, titanium dioxide, artificial cherry flavor, and artificial banana flavor
Brand names are registered trademarks of their respective owners.
Coumadin® is a registered trademark of Bristol-Myers Squibb, Inc.
Ketek® is a registered trademark of Aventis Pharmaceuticals Inc.
This product's label may have been updated. For current full prescribing information, please visit www.pfizer.com
This Patient Information has been approved by the U.S. Food and Drug Administration.