DYLOJECT- diclofenac sodium injection, solution
HIGHLIGHTS OF PRESCRIBING INFORMATION
These highlights do not include all the information needed to use DYLOJECT safely and effectively. See full prescribing information for DYLOJECT.
DYLOJECT™ (diclofenac sodium) Injection, for intravenous use
Initial U.S. Approval: 1988
WARNING: RISK OF SERIOUS CARDIOVASCULAR AND GASTROINTESTINAL EVENTS
See full prescribing information for complete boxed warning.
RECENT MAJOR CHANGES
INDICATIONS AND USAGE
DOSAGE AND ADMINISTRATION
DOSAGE FORMS AND STRENGTHS
DYLOJECT (diclofenac sodium) Injection, single use vial containing 37.5 mg/mL. (3)
WARNINGS AND PRECAUTIONS
The most common adverse reactions (>5%) in controlled clinical trials include nausea, constipation, headache, infusion site pain, dizziness, flatulence, vomiting, and insomnia. (6)
To report SUSPECTED ADVERSE REACTIONS, contact Hospira, Inc. at 1-800-441-4100, or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
USE IN SPECIFIC POPULATIONS
See 17 for PATIENT COUNSELING INFORMATION.
FULL PRESCRIBING INFORMATION: CONTENTS*
Cardiovascular Thrombotic Events
Gastrointestinal Bleeding, Ulceration, and Perforation
DYLOJECT is indicated in adults for the:
Use for the shortest duration consistent with individual patient treatment goals [see Warnings and Precautions (5)].
DYLOJECT is for intravenous administration only.
After observing the response to initial therapy with DYLOJECT, the frequency should be adjusted to suit an individual patient’s needs. Do not exceed 150 mg total daily dose.
For the treatment of acute pain, the recommended dose of DYLOJECT is 37.5 mg administered by intravenous bolus injection over 15 seconds every 6 hours as needed, Maximum daily dose is 150 mg.
To reduce the risk of renal adverse reactions, patients must be well hydrated prior to administration of DYLOJECT.
Visually inspect parenteral drug products for particulate matter and discoloration prior to administration. If visibly opaque particles, discoloration or other foreign particles are observed, the solution should not be used.
DYLOJECT (diclofenac) Injection: 37.5 mg/mL in a single-dose glass vial. DYLOJECT is a clear, colorless, aqueous, nonpyrogenic sterile solution.
DYLOJECT is contraindicated in the following patients:
NSAIDs, including diclofenac, cause serious gastrointestinal (GI) adverse events including inflammation, bleeding, ulceration, and perforation of the esophagus, stomach, small intestine, or large intestine, which can be fatal. These serious adverse events can occur at any time, with or without warning symptoms, in patients treated with NSAIDs. Only one in five patients who develop a serious upper GI adverse event on NSAID therapy is symptomatic. Upper GI ulcers, gross bleeding, or perforation caused by NSAIDs occurred in approximately 1% of patients treated for 3-6 months and in about 2%-4% of patients treated for one year. DYLOJECT is administered by intravenous injection and is intended for acute short term use. However, even short-term NSAID therapy is not without risk.
Risk Factors for GI Bleeding, Ulceration, and Perforation
Patients with a prior history of peptic ulcer disease and/or GI bleeding who used NSAIDs had a greater than 10-fold increased risk for developing a GI bleed compared to patients without these risk factors. Other factors that increase the risk of GI bleeding in patients treated with NSAIDs include longer duration of NSAID therapy; concomitant use of oral corticosteroids, aspirin, anticoagulants, or selective serotonin reuptake inhibitors (SSRIs); smoking; use of alcohol; older age; and poor general health status. Most postmarketing reports of fatal GI events occurred in elderly or debilitated patients. Additionally, patients with advanced liver disease and/or coagulopathy are at increased risk for GI bleeding.
Strategies to Minimize the GI Risks in NSAID-treated Patients:
In clinical trials of oral diclofenac-containing products, meaningful elevations (i.e., more than 3 times the ULN) of AST (SGOT) were observed in about 2% of approximately 5,700 patients at some time during diclofenac treatment (ALT was not measured in all studies).
In a large, open-label, controlled trial of 3,700 patients treated with oral diclofenac sodium for 2-6 months, patients were monitored first at 8 weeks and 1,200 patients were monitored again at 24 weeks. Meaningful elevations of ALT and/or AST occurred in about 4% of patients and included marked elevations (greater than 8 times the ULN) in about 1% of the 3,700 patients. In that open-label study, a higher incidence of borderline (less than 3 times the ULN), moderate (3-8 times the ULN), and marked (greater than 8 times the ULN) elevations of ALT or AST was observed in patients receiving diclofenac when compared to other NSAIDs. Elevations in transaminases were seen more frequently in patients with osteoarthritis than in those with rheumatoid arthritis.
Almost all meaningful elevations in transaminases were detected before patients became symptomatic. Abnormal tests occurred during the first 2 months of therapy with diclofenac in 42 of the 51 patients in all trials who developed marked transaminase elevations.
In postmarketing reports, cases of drug-induced hepatotoxicity have been reported in the first month, and in some cases, the first 2 months of therapy, but can occur at any time during treatment with diclofenac.
Postmarketing surveillance has reported cases of severe hepatic reactions, including liver necrosis, jaundice, fulminant hepatitis with and without jaundice, and liver failure. Some of these reported cases resulted in fatalities or liver transplantation.
In a European retrospective population-based, case-controlled study, 10 cases of diclofenac associated drug-induced liver injury with current use compared with non-use of diclofenac were associated with a statistically significant 4-fold adjusted odds ratio of liver injury. In this particular study, based on an overall number of 10 cases of liver injury associated with diclofenac, the adjusted odds ratio increased further with female sex, doses of 150 mg or more, and duration of use for more than 90 days.
Physicians should measure transaminases at baseline and periodically in patients receiving long-term therapy with diclofenac, because severe hepatotoxicity may develop without a prodrome of distinguishing symptoms. The optimum times for making the first and subsequent transaminase measurements are not known. Based on clinical trial data and postmarketing experiences, transaminases should be monitored within 4 to 8 weeks after initiating treatment with diclofenac. DYLOJECT is not indicated for long-term treatment. However, severe hepatic reactions can occur at any time during treatment with diclofenac.
If abnormal liver tests persist or worsen, if clinical signs and/or symptoms consistent with liver disease develop, or if systemic manifestations occur (e.g. eosinophilia, rash, abdominal pain, diarrhea, dark urine, etc.), DYLOJECT should be discontinued immediately.
Inform patients of the warning signs and symptoms of hepatotoxicity (e.g., nausea, fatigue, lethargy, diarrhea, pruritus, jaundice, right upper quadrant tenderness, and "flu-like" symptoms). If clinical signs and symptoms consistent with liver disease develop, or if systemic manifestations occur (e.g., eosinophilia, rash, etc.), discontinue DYLOJECT immediately, and perform a clinical evaluation of the patient.
To minimize the potential risk for an adverse liver-related event in patients treated with diclofenac, use the lowest effective dose for the shortest duration possible. Exercise caution when prescribing DYLOJECT with concomitant drugs that are known to be potentially hepatotoxic (e.g., acetaminophen, antibiotics, anti-epileptics).
NSAIDs, including DYLOJECT, can lead to new onset of hypertension or worsening of preexisting hypertension, either of which may contribute to the increased incidence of CV events.
Patients taking angiotensin converting enzyme (ACE) inhibitors, thiazide diuretics, or loop diuretics may have impaired response to these therapies when taking NSAIDs [see Drug Interactions (7)]. Monitor blood pressure (BP) during the initiation of NSAID treatment and throughout the course of therapy.
Long-term administration of NSAIDs has resulted in renal papillary necrosis and other renal injury.
Renal toxicity has also been seen in patients in whom renal prostaglandins have a compensatory role in the maintenance of renal perfusion. In these patients, administration of an NSAID may cause a dose-dependent reduction in prostaglandin formation and, secondarily, in renal blood flow, which may precipitate overt renal decompensation. Patients at greatest risk of this reaction are those with impaired renal function, dehydration, hypovolemia, heart failure, liver dysfunction, those taking diuretics and ACE inhibitors or ARBs, and the elderly. Discontinuation of NSAID therapy is usually followed by recovery to the pretreatment state.
DYLOJECT is not recommended in patients with moderate to severe renal insufficiency and is contraindicated in patients with moderate to severe renal insufficiency in the perioperative period and who are at risk for volume depletion. Acute renal decompensation was observed in 4% out of 68 patients enrolled with renal impairment and treated with DYLOJECT in clinical trials in the perioperative period.
Correct volume status in dehydrated or hypovolemic patients prior to initiating DYLOJECT. Monitor renal function in patients with renal or hepatic impairment, heart failure, dehydration, or hypovolemia during use of DYLOJECT [see Drug Interactions (7)]. Avoid the use of DYLOJECT in patients with advanced renal disease unless the benefits are expected to outweigh the risk of worsening renal function. If DYLOJECT is used in patients with advanced renal disease, monitor patients for signs of worsening renal function.
Increases in serum potassium concentration, including hyperkalemia, have been reported with use of NSAIDs, even in some patients without renal impairment. In patients with normal renal function, these effects have been attributed to a hyporeninemic-hypoaldosteronism state.
Diclofenac has been associated with anaphylactic reactions in patients with and without known hypersensitivity to diclofenac and in patients with aspirin-sensitive asthma [see Contraindications (4) and Warnings and Precautions (5.8)].
Seek emergency help if an anaphylactic reaction occurs.
A subpopulation of patients with asthma may have aspirin-sensitive asthma which may include chronic rhinosinusitis complicated by nasal polyps; severe, potentially fatal bronchospasm; and/or intolerance to aspirin and other NSAIDs. Because cross-reactivity between aspirin and other NSAIDs has been reported in such aspirin-sensitive patients, DYLOJECT is contraindicated in patients with this form of aspirin sensitivity [see Contraindications (4)]. When DYLOJECT is used in patients with preexisting asthma (without known aspirin sensitivity), monitor patients for changes in the signs and symptoms of asthma.
NSAIDs, including diclofenac, can cause serious skin adverse reactions such as exfoliative dermatitis, Stevens-Johnson Syndrome (SJS), and toxic epidermal necrolysis (TEN), which can be fatal. These serious events may occur without warning. Inform patients about the signs and symptoms of serious skin reactions, and to discontinue the use of DYLOJECT at the first appearance of skin rash or any other sign of hypersensitivity. DYLOJECT is contraindicated in patients with previous serious skin reactions to NSAIDs [see Contraindications (4)].
Diclofenac may cause premature closure of the fetal ductus arteriosus. Avoid use of NSAIDs, including DYLOJECT, in pregnant women starting at 30 weeks of gestation (third trimester) [see Use in Specific Populations (8.1)].
Anemia has occurred in NSAID-treated patients. This may be due to occult or gross blood loss, fluid retention, or an incompletely described effect on erythropoiesis. If a patient treated with DYLOJECT has any signs or symptoms of anemia, monitor hemoglobin or hematocrit.
NSAIDs, including DYLOJECT, may increase the risk of bleeding events. Co-morbid conditions such as coagulation disorders, concomitant use of warfarin, other anticoagulants, antiplatelet agents (e.g., aspirin), serotonin reuptake inhibitors (SSRIs) and serotonin norepinephrine reuptake inhibitors (SNRIs) may increase this risk. Monitor these patients for signs of bleeding [see Drug Interactions (7)].
The pharmacological activity of DYLOJECT in reducing inflammation, and possibly fever, may diminish the utility of diagnostic signs in detecting infections.
Because serious GI bleeding, hepatotoxicity, and renal injury can occur without warning symptoms or signs, consider monitoring patients on long-term NSAID treatment with a CBC and chemistry profile periodically [see Warnings and Precautions (5.2, 5.3, 5.6)]. DYLOJECT is not indicated for long-term treatment.
The following adverse reactions are discussed in greater detail in other sections of the labeling:
Because clinical studies are conducted under widely varying conditions, adverse reaction rates observed in the clinical studies of a drug cannot be directly compared to rates in the clinical studies of another drug and may not reflect the rates observed in practice.
During clinical development, 1,156 patients were exposed to DYLOJECT in multiple-dose, controlled and open-label studies. DYLOJECT was administered post-surgically every 6 hours for up to 5 days. The incidence rates of adverse reactions listed in the following table are derived from multicenter, controlled clinical studies in post-operative patients comparing DYLOJECT to placebo in patients who may have also received morphine rescue medication.
MedDRA Preferred Term
Infusion Site Pain
Infusion Site Extravasation
Adverse reactions of special interest
Based on the analysis of the pooled data from the multi-dose, controlled clinical trials, post-operative patients treated with DYLOJECT had more adverse reactions related to wound healing (7.5%) compared to patients treated with placebo (4%).
Adverse reactions from clinical studies or spontaneous reports for other formulations of diclofenac and other NSAIDs
In patients taking diclofenac or other NSAIDs, the most frequently reported adverse reactions occurring in approximately 1%-10% of patients are:
Gastrointestinal experiences including abdominal pain, constipation, diarrhea, dyspepsia, flatulence, gross bleeding/perforation, heartburn, nausea, GI ulcers (gastric/duodenal) and vomiting.
Abnormal renal function, anemia, dizziness, edema, elevated liver enzymes, headaches, increased bleeding time, pruritus, rashes and tinnitus.
Additional adverse reactions reported occasionally include:
Body as a Whole: fever, infection, sepsis
Cardiovascular System: congestive heart failure, hypertension, tachycardia, syncope
Digestive System: esophagitis, gastric/peptic ulcers, gastritis, gastrointestinal bleeding, glossitis, hematemesis, hepatitis, jaundice
Hemic and Lymphatic System: ecchymosis, eosinophilia, leukopenia, melena, purpura, rectal bleeding, stomatitis, thrombocytopenia
Metabolic and Nutritional: weight changes
Nervous System: anxiety, asthenia, confusion, depression, dream abnormalities, drowsiness, insomnia, malaise, nervousness, paresthesia, somnolence, tremors, vertigo
Respiratory System: asthma, dyspnea
Skin and Appendages: alopecia, photosensitivity, sweating increased
Special Senses: blurred vision
Urogenital System: cystitis, dysuria, hematuria, interstitial nephritis, oliguria/polyuria, proteinuria, renal failure
Other adverse reactions, which occur rarely are:
Body as a Whole: anaphylactic reactions, appetite changes, death
Cardiovascular System: arrhythmia, hypotension, myocardial infarction, palpitations, vasculitis
Digestive System: colitis, eructation, fulminant hepatitis with and without jaundice, liver failure, liver necrosis, pancreatitis
Hemic and Lymphatic System: agranulocytosis, hemolytic anemia, aplastic anemia, lymphadenopathy, pancytopenia
Metabolic and Nutritional: hyperglycemia
Nervous System: convulsions, coma, hallucinations, meningitis
Respiratory System: respiratory depression, pneumonia
Skin and Appendages: angioedema, toxic epidermal necrolysis, erythema multiforme, exfoliative dermatitis, Stevens-Johnson syndrome, urticaria
Special Senses: conjunctivitis, hearing impairment
See Table 2 for clinically significant drug interactions with diclofenac.
Drugs That Interfere with Hemostasis
Monitor patients with concomitant use of DYLOJECT with anticoagulants (e.g., warfarin), antiplatelet agents (e.g., aspirin), selective serotonin reuptake inhibitors (SSRIs), and serotonin norepinephrine reuptake inhibitors (SNRIs) for signs of bleeding [see Warnings and Precautions (5.11)].
Controlled clinical studies showed that the concomitant use of NSAIDs and analgesic doses of aspirin does not produce any greater therapeutic effect than the use of NSAIDs alone. In a clinical study, the concomitant use of an NSAID and aspirin was associated with a significantly increased incidence of GI adverse reactions as compared to use of the NSAID alone [see Warnings and Precautions (5.2)].
Concomitant use of DYLOJECT and analgesic doses of aspirin is not generally recommended because of the increased risk of bleeding [see Warnings and Precautions (5.11)].
DYLOJECT is not a substitute for low dose aspirin for cardiovascular protection.
ACE Inhibitors, Angiotensin Receptor Blockers, and Beta-Blockers
Clinical studies, as well as post-marketing observations, showed that NSAIDs reduced the natriuretic effect of loop diuretics (e.g., furosemide) and thiazide diuretics in some patients. This effect has been attributed to the NSAID inhibition of renal prostaglandin synthesis.
During concomitant use of DYLOJECT with diuretics, observe patients for signs of worsening renal function, in addition to assuring diuretic efficacy including antihypertensive effects [see Warnings and Precautions (5.6)].
The concomitant use of diclofenac with digoxin has been reported to increase the serum concentration and prolong the half-life of digoxin.
During concomitant use of DYLOJECT and digoxin, monitor serum digoxin levels.
NSAIDs have produced elevations in plasma lithium levels and reductions in renal lithium clearance. The mean minimum lithium concentration increased 15%, and the renal clearance decreased by approximately 20%. This effect has been attributed to NSAID inhibition of renal prostaglandin synthesis.
During concomitant use of DYLOJECT and lithium, monitor patients for signs of lithium toxicity.
Concomitant use of NSAIDs and methotrexate may increase the risk for methotrexate toxicity (e.g., neutropenia, thrombocytopenia, renal dysfunction).
During concomitant use of DYLOJECT and methotrexate, monitor patients for methotrexate toxicity.
Concomitant use of DYLOJECT and cyclosporine may increase cyclosporine’s nephrotoxicity.
During concomitant use of DYLOJECT and cyclosporine, monitor patients for signs of worsening renal function.
NSAIDs and Salicylates
Concomitant use of diclofenac with other NSAIDs or salicylates (e.g., diflunisal, salsalate) increases the risk of GI toxicity, with little or no increase in efficacy [see Warnings and Precautions (5.2)].
The concomitant use of diclofenac with other NSAIDs or salicylates is not recommended.
Concomitant use of DYLOJECT and pemetrexed may increase the risk of pemetrexed-associated myelosuppression, renal, and GI toxicity (see the pemetrexed prescribing information).
During concomitant use of DYLOJECT and pemetrexed, in patients with renal impairment whose creatinine clearance ranges from 45 to 79 mL/min, monitor for myelosuppression, renal and GI toxicity.
NSAIDs with short elimination half-lives (e.g., diclofenac, indomethacin) should be avoided for a period of two days before, the day of, and two days following administration of pemetrexed.
In the absence of data regarding potential interaction between pemetrexed and NSAIDs with longer half-lives (e.g., meloxicam, nabumetone), patients taking these NSAIDs should interrupt dosing for at least five days before, the day of, and two days following pemetrexed administration.
Inhibitors or Inducers of Cytochrome P450 2C9
Diclofenac is metabolized by cytochrome P450 enzymes, predominantly by CYP2C9. Co-administration of diclofenac with CYP2C9 inhibitors (e.g. voriconazole) may enhance the exposure and toxicity of diclofenac whereas co-administration with CYP2C9 inducers (e.g. rifampin) may lead to compromised efficacy of diclofenac.
Use caution when dosing diclofenac with CYP2C9 inhibitors or inducers, a dosage adjustment may be warranted
[see Clinical Pharmacology (12.3)].
Pregnancy Category C prior to 30 weeks gestation; Category D starting at 30 weeks gestation.
Use of NSAIDs, including DYLOJECT, during the third trimester of pregnancy increases the risk of premature closure of the fetal ductus arteriosus. Avoid use of NSAIDs, including DYLOJECT, in pregnant women starting at 30 weeks of gestation (third trimester).
There are no adequate and well-controlled studies of DYLOJECT in pregnant women. Data from observational studies regarding potential embryofetal risks of NSAID use in women in the first or second trimesters of pregnancy are inconclusive. In the general U.S. population, all clinically recognized pregnancies, regardless of drug exposure, have a background rate of 2-4% for major malformations, and 15-20% for pregnancy loss.
In animal reproduction studies, no evidence of teratogenicity was observed in mice, rats, and rabbits given diclofenac during the period of organogenesis at doses up to approximately 0.7, 0.7, and 1.3 times, respectively, the maximum recommended human dose (MRHD) of DYLOJECT despite the presence of maternal and fetal toxicity at these doses [see Data]. Based on animal data, prostaglandins have been shown to have an important role in endometrial vascular permeability, blastocyst implantation, and decidualization. In animal studies, administration of prostaglandin synthesis inhibitors such as diclofenac, resulted in increased pre- and post-implantation loss.
Labor or Delivery
There are no studies on the effects of DYLOJECT during labor or delivery. In animal studies, NSAIDS, including diclofenac, inhibit prostaglandin synthesis, cause delayed parturition, and increase the incidence of stillbirth.
Reproductive and developmental studies in animals demonstrated that diclofenac sodium administration during organogenesis did not produce teratogenicity despite the induction of maternal toxicity and fetal toxicity in mice at oral doses up to 20 mg/kg/day (approximately 0.7 times the maximum recommended human dose [MRHD] of DYLOJECT, 150 mg/day, based on body surface area (BSA) comparison), and in rats and rabbits at oral doses up to 10 mg/kg/day (approximately 0.7 and 1.3 times, respectively, the MRHD based on BSA comparison). In rats, maternally toxic doses were associated with dystocia, prolonged gestation, reduced fetal weights and growth, and reduced fetal survival. Diclofenac has been shown to cross the placental barrier in mice, rats, and humans.
Based on available data, diclofenac may be present in human milk. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for DYLOJECT and any potential adverse effects on the breastfed infant from the DYLOJECT or from the underlying maternal condition.
One woman treated orally with a diclofenac salt, 150 mg/day, had a milk diclofenac level of 100 mcg/L, equivalent to an infant dose of about 0.03 mg/kg/day. Diclofenac was not detectable in breast milk in 12 women using diclofenac (after either 100 mg/day orally for 7 days or a single 50 mg intramuscular dose administered in the immediate postpartum period).
Based on the mechanism of action, the use of prostaglandin-mediated NSAIDs, including DYLOJECT, may delay or prevent rupture of ovarian follicles, which has been associated with reversible infertility in some women. Published animal studies have shown that administration of prostaglandin synthesis inhibitors has the potential to disrupt prostaglandin-mediated follicular rupture required for ovulation. Small studies in women treated with NSAIDs have also shown a reversible delay in ovulation. Consider withdrawal of NSAIDs, including DYLOJECT, in women who have difficulties conceiving or who are undergoing investigation of infertility.
The safety and efficacy of DYLOJECT has not been established in pediatric patients.
Elderly patients, compared to younger patients, are at greater risk for NSAID-associated serious cardiovascular, gastrointestinal, and/or renal adverse reactions. If the anticipated benefit for the elderly patient outweighs these potential risks, start dosing at the low end of the dosing range, and monitor patients for adverse effects [see Warnings and Precautions (5.1, 5.2, 5.3, 5.6, 5.13)].
Diclofenac metabolites are known to be substantially excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, care should be taken in dose selection, and it may be useful to monitor renal function.
The pharmacokinetics of DYLOJECT are similar in elderly compared to young adults [see Clinical Pharmacology (12.3)].
Orally administered diclofenac sodium is extensively metabolized. The pharmacokinetics of DYLOJECT are similar in patients with mild hepatic impairment compared to healthy subjects [see Clinical Pharmacology (12.3)]. Dosing adjustments in patients with mild hepatic impairment is not necessary. The pharmacokinetics of DYLOJECT were not studied in patients with moderate to severe hepatic impairment and use in this population is not recommended.
Pharmacokinetics of DYLOJECT in patients with mild to moderate renal impairment is similar compared to healthy subjects. However, acute renal decompensation was observed in 4% out of 68 patients enrolled with renal impairment and treated with DYLOJECT in clinical trials in the perioperative period. DYLOJECT is not recommended in patients with moderate to severe renal insufficiency and is contraindicated in patients with moderate to severe renal insufficiency in the perioperative period and who are at risk for volume depletion [see Contraindications (4), Warnings and Precautions (5.6) and Clinical Pharmacology (12.3)].
Pharmacokinetics of diclofenac following DYLOJECT injection appear to be dependent on body weight. The effect of body weight on clinical efficacy and safety of DYLOJECT has not been fully studied. Therefore, adjusting dose based on body weight is not recommended [see Clinical Pharmacology (12.3)].
Symptoms following acute NSAID overdosages have been typically limited to lethargy, drowsiness, nausea, vomiting, and epigastric pain, which have been generally reversible with supportive care. Gastrointestinal bleeding has occurred. Hypertension, acute renal failure, respiratory depression and coma have occurred, but were rare [see Warnings and Precautions (5.1, 5.2, 5.4, 5.6)].
Manage patients with symptomatic and supportive care following an NSAID overdosage. There are no specific antidotes. Forced diuresis, alkalinization of urine, hemodialysis, or hemoperfusion may not be useful due to high protein binding.
For additional information about overdosage treatment contact a poison control center (1-800-222-1222).
DYLOJECT (diclofenac sodium) Injection is a nonsteroidal anti-inflammatory drug for intravenous administration. Each mL of aqueous solution contains 37.5 mg of diclofenac sodium (34.8 mg of diclofenac).
Diclofenac sodium is a phenylacetic acid derivative that is a white to off-white, virtually odorless, crystalline powder. Diclofenac sodium is freely soluble in methanol, soluble in ethanol, and practically insoluble in chloroform and in dilute acid. Diclofenac sodium is sparingly soluble in water. Its chemical formula and name are: C14H10Cl2NO2Na [M.W. = 318.14] 2-[(2,6-dichlorophenyl) amino] benzeneacetic acid, monosodium salt.
DYLOJECT is a clear colorless sterile solution. The inactive ingredients of DYLOJECT include: 333 mg hydroxypropyl betadex (HPβCD), 5 mg monothioglycerol, sodium hydroxide and/or hydrochloric acid for pH adjustment, and water for injection.
Diclofenac has analgesic, anti-inflammatory, and antipyretic properties.
The mechanism of action of DYLOJECT, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2).
Diclofenac is a potent inhibitor of prostaglandin synthesis in vitro. Diclofenac concentrations reached during therapy have produced in vivo effects. Prostaglandins sensitize afferent nerves and potentiate the action of bradykinin in inducing pain in animal models. Prostaglandins are mediators of inflammation. Because diclofenac is an inhibitor of prostaglandin synthesis, its mode of action may be due to a decrease of prostaglandins in peripheral tissues.
The effect of DYLOJECT on QTc prolongation was evaluated in a randomized, double-blind, positive (moxifloxacin 400 mg) - and placebo-controlled crossover study in healthy subjects. A total of 70 subjects was administered diclofenac sodium 37.5 mg and 75 mg. In a study with demonstrated ability to detect small effects, the upper bound of the 90% confidence interval for the largest placebo-adjusted, baseline-corrected QTc based on Fridericia correction method (QTcF) was below 10 ms, the threshold for regulatory concern.
Following intravenous administration of DYLOJECT to healthy volunteers, plasma concentrations of diclofenac exceed that of immediate-release oral diclofenac for the first 45 minutes reaching a maximum of 4.8-fold 5 minutes after administration.
The pharmacokinetics of diclofenac following intravenous administration of DYLOJECT and oral doses of immediate-release diclofenac are compared in Table 3.
|IV=intravenous; PO=oral; 1CL and Vz are CL/F and Vz/F for oral immediate release diclofenac|
Oral IR Diclofenac
6,031 ± 1,178
1,859 ± 376
1.44 ± 0.27
324 ± 63.0
40.1 ± 9.77
1,562 ± 519
1.28 ± 0.27
526 ± 179
57.3 ± 20.4
5,617 ± 1,799
1,839 ± 506
2.29 ± 0.63
387 ± 394
83.4 ± 127
851 ± 462
1,350 ± 601
2.80 ± 0.66
894 ± 1,392
242 ± 486
DYLOJECT administered as an intravenous bolus dose of 37.5 mg every 6 hours for 4 doses to healthy subjects (N=36) showed minimal accumulation with mean values for Cmax and AUC equivalent between the first and the fourth dose.
DYLOJECT exhibits linear pharmacokinetics over intravenous doses ranging from 18.75 to 75 mg and injection times ranging from a bolus (less than 5 seconds) to 60 seconds.
Following administration of DYLOJECT, the apparent volume of distribution during the terminal elimination phase (Vz) of diclofenac is 40.1 ± 9.77 L.
Diclofenac is more than 99% bound to human serum proteins, primarily albumin. Serum binding is constant over the concentration range (0.15-105 mcg/mL) achieved with the recommended doses.
Diclofenac diffuses into and out of the synovial fluid. Diffusion into the joint occurs when plasma levels are higher than those in the synovial fluid, after which the process reverses and synovial fluid levels are higher than plasma levels. It is not known whether diffusion into the joint plays a role in the effectiveness of diclofenac.
HPβCD is distributed in the extracellular fluids following administration of DYLOJECT, and has a volume of distribution during the terminal elimination phase (Vz) of 21.8 ±7.36 L.
Five diclofenac metabolites have been identified in human plasma and urine. The metabolites include 4’-hydroxy-, 5-hydroxy-, 3’-hydroxy-, 4’, 5-dihydroxy- and 3’-hydroxy-4’-methoxy diclofenac. The major diclofenac metabolite, 4’-hydroxy-diclofenac, has very weak pharmacologic activity. The formation of 4’-hydroxy diclofenac is primarily mediated by CYP2C9. Both diclofenac and its oxidative metabolites undergo glucuronidation or sulfation followed by biliary excretion. Acylglucuronidation mediated by UGT2B7 and oxidation mediated by CYP2C8 may also play a role in diclofenac metabolism. CYP3A4 is responsible for the formation of minor metabolites, 5-hydroxy and 3’-hydroxy- diclofenac.
In patients with renal dysfunction, peak concentrations of metabolites 4’-hydroxy- and 5-hydroxy-diclofenac were approximately 50% and 4% of the parent compound after single oral dosing compared to 27% and 1% in normal healthy subjects.
Diclofenac is eliminated through metabolism and subsequent urinary and biliary excretion of the glucuronide and the sulfate conjugates of the metabolites.
Plasma concentrations of DYLOJECT decline from peak levels in a biexponential fashion, with a terminal phase half-life of approximately 1.4 hours following intravenous administration.
Total systemic clearance of diclofenac in plasma following administration of DYLOJECT is 324 ± 63 mL/min.
Little or no free unchanged diclofenac is excreted in the urine following administration of DYLOJECT. Approximately 65% of the dose is excreted in the urine and approximately 35% in the bile as conjugates of unchanged diclofenac plus metabolites. Less than 1% is excreted as unchanged substance.
The terminal half-life of HPβCD in plasma following administration of DYLOJECT is approximately 2.7 ± 1.4 hours.
Pediatric: The pharmacokinetics of DYLOJECT have not been established in pediatric subjects [see Use in Specific Populations (8.4)].
Geriatrics: The effect of aging on the pharmacokinetics of DYLOJECT was studied in 88 subjects from 18 to 86 years old. The terminal half-life for subjects aged 65 to 74 years was 1.4 hours and for subjects greater than or equal to 75 years was 2.1 hours. Clearance of diclofenac following administration of DYLOJECT was not affected by age [see Use in Specific Populations (8.5)].
Race: Pharmacokinetics of diclofenac following injection of DYLOJECT was studied in Caucasian, Black/African and Asian subjects. After taking body weight into account there was no difference in pharmacokinetics of diclofenac with respect to race [see Pharmacokinetics (12.3)].
Sex: Systemic exposure of diclofenac was 30% higher in females compared to males following DYLOJECT administration. However, this is possibly due to the effect of body weight on clearance of diclofenac. After taking body weight into account there was no difference in pharmacokinetics of diclofenac with respect to sex [see Pharmacokinetics (12.3)].
The pharmacokinetics of DYLOJECT were evaluated in 8 subjects with mild hepatic impairment (Child-Pugh Classification A, Score of 5 to 6 and a bilirubin of less than or equal to 2.5 mg/dL) compared to matched healthy subjects. The pharmacokinetics of diclofenac following administration of DYLOJECT in mild hepatic impaired subjects were not altered. Pharmacokinetics of DYLOJECT has not been evaluated in moderate or severe hepatic impaired subjects [see Use in Specific Populations (8.6)].
The pharmacokinetics of DYLOJECT in mild (n = 8), and moderate (n = 5) renal impaired subjects were not significantly altered compared to healthy subjects (n = 7) [see Warnings and Precautions (5.3) and Use in Specific Populations (8.7)].
Effect of Body Weight
Pharmacokinetics of diclofenac following DYLOJECT injection appear to be dependent on body weight. The pharmacokinetics of DYLOJECT were studied in 88 subjects ranging in weight from 53 to 156.2 kg. Clearance of diclofenac in subjects weighing below 95 kg is 282±68 mL/min compared to 356±53 mL/min in subjects above 95 kg body weight (approximately 30% higher clearance). The volume of distribution increased with increased body weight and the proportional increase in clearance resulted in no change in elimination half-life with increased body weight [see Use in Specific Populations (8.8)].
Drug Interaction Studies
Aspirin: When NSAIDs were administered with aspirin, the protein binding of NSAIDs were reduced, although the clearance of free NSAID was not altered. The clinical significance of this interaction is not known. See Table 1 for clinically significant drug interactions of NSAIDs with aspirin [see Drug Interactions (7)].
Long-term carcinogenicity studies in rats given diclofenac sodium up to 2 mg/kg/day (approximately 0.13 times the maximum recommended human dose [MRHD] of DYLOJECT, 150 mg/day, based on mg/m2 body surface area [BSA] comparison) have revealed no significant increase in tumor incidence. A 2-year carcinogenicity study conducted in mice employing diclofenac sodium at doses up to 0.3 mg/kg/day (approximately 0.01 times the MRHD based on BSA comparison) in males and 1 mg/kg/day (approximately 0.04 times the MRHD based on BSA comparison) in females did not reveal any oncogenic potential.
Diclofenac sodium did not show mutagenic activity in in vitro point mutation assays in mammalian (mouse lymphoma) and microbial (yeast, Ames) test systems and was nonmutagenic in several mammalian in vitro and in vivo tests, including dominant lethal and male germinal epithelial chromosomal aberration studies in Chinese hamsters.
Impairment of Fertility
Diclofenac sodium administered to male and female rats at 4 mg/kg/day (approximately 0.3 times the MRHD based on BSA comparison) did not affect fertility.
The effect of DYLOJECT in the short-term treatment of acute pain was evaluated in two double-blind, placebo and active-controlled, multiple-dose clinical trials in patients with postoperative pain. In both trials, intravenous morphine was permitted as rescue medication for pain management.
In a controlled, multiple-dose study of adult patients with postoperative pain who had undergone elective abdominal or pelvic surgery, 245 patients were treated with DYLOJECT, a positive NSAID control (ketorolac tromethamine), or placebo administered every 6 hours starting within 6 hours after surgery and for up to 5 days. The study population consisted of patients with a mean age of 43 years (range 18 to 65 years) and a minimum pain intensity of 50 mm on a 100-mm visual analog scale (VAS) at baseline. The mean baseline pain intensity on the VAS was 68 mm (range 50 to 100 mm). Approximately 63% of subjects in the DYLOJECT 37.5 mg group and 92% of subjects in the placebo group took rescue medication within the first 48 hours of the treatment phase. Efficacy was demonstrated by a reduction in pain intensity as measured by the sum of the pain intensity differences over 0 to 48 hours in patients receiving DYLOJECT as compared to placebo. The average pain intensities over time are depicted for the treatment groups in Figure 1.
In a second controlled, multiple-dose study of adult patients with postoperative pain who had undergone elective orthopedic surgery, 277 patients were treated with DYLOJECT, a positive NSAID control (ketorolac tromethamine), or placebo administered every 6 hours starting within 6 hours postsurgery and for up to 5 days. The study population consisted of patients with a mean age of 55 years (range 19 to 84 years) and a minimum pain intensity of 50 mm on a 100-mm VAS at baseline. The mean baseline pain intensity on the VAS was 69 mm (range 50 to 100 mm). Approximately 74% of subjects in the DYLOJECT group and 92% of subjects in the placebo group took rescue medication within the first 48 hours of the treatment phase. Efficacy was demonstrated by a reduction in pain intensity as measured by the sum of the pain intensity differences over 0 to 48 hours in patients receiving DYLOJECT as compared to placebo. The average pain intensities over time are depicted for the treatment groups in Figure 2.
Figure 1: Pain Intensity Score Versus Time Figure 2: Pain Intensity Score Versus Time
DYLOJECT (diclofenac sodium) Injection, is a clear, colorless solution that is supplied as a 1 mL fill in a clear 2 mL glass vial with an orange tamper-evident top.
Carton of 25 vials
Store at Controlled Room Temperature 20 to 25°C (68 to 77°F) [see USP Controlled Room Temperature].
Do not freeze. Protect from light.
Keep DYLOJECT out of reach and sight of children.
Not made with natural rubber latex.
Inform patients, families, or their caregivers of the following information before initiating therapy with DYLOJECT and periodically during the course of ongoing therapy.
Cardiovascular Thrombotic Events
Advise patients to be alert for the symptoms of cardiovascular thrombotic events, including chest pain, shortness of breath, weakness, or slurring of speech, and to report any of these symptoms to their health care provider immediately [see Warnings and Precautions (5.1)].
Gastrointestinal Bleeding, Ulceration, and Perforation
Advise patients to report symptoms of ulcerations and bleeding, including epigastric pain, dyspepsia, melena, and hematemesis to their health care provider. In the setting of concomitant use of low-dose aspirin for cardiac prophylaxis, inform patients of the increased risk for and the signs and symptoms of GI bleeding [see Warnings and Precautions (5.2)].
Inform patients of the warning signs and symptoms of hepatotoxicity (e.g., nausea, fatigue, lethargy, pruritus, diarrhea, jaundice, right upper quadrant tenderness, and “flu-like” symptoms). If these occur instruct patients to stop DYLOJECT and seek immediate medical therapy [see Warnings and Precautions (5.3)].
Heart Failure and Edema
Advise patients to be alert for the symptoms of congestive heart failure including shortness of breath, unexplained weight gain, or edema and to contact their healthcare provider if such symptoms occur [see Warnings and Precautions (5.5)].
Inform patients of the signs of an anaphylactic reaction (e.g., difficulty breathing, swelling of the face or throat). Instruct patients to seek immediate emergency help if these occur [see Contraindications(4) and Warnings and Precautions (5.7)].
Serious Skin Reactions
Advise patients to stop DYLOJECT immediately if they develop any type of rash, and to contact their healthcare provider as soon as possible [see Warnings and Precautions (5.9)].
Advise females of reproductive potential who desire pregnancy that NSAIDs, including DYLOJECT, may be associated with a reversible delay in ovulation [see Use in Specific Populations (8.3)].
Inform pregnant women to avoid use of DYLOJECT and other NSAIDs starting at 30 weeks gestation, because of the risk of the premature closing of the fetal ductus arteriosus [see Warnings and Precautions (5.10) and Use in Specific Populations (8.1)].
Avoid Concomitant Use of NSAIDs
Inform patients that the concomitant use of DYLOJECT with other NSAIDs or salicylates (e.g., diflunisal, salsalate) is not recommended due to the increased risk of gastrointestinal toxicity, and little or no increase in efficacy [see Warnings and Precautions (5.2) and Drug Interactions (7)]. Alert patients that NSAIDs may be present in “over the counter” medications for treatment of colds, fever, or insomnia.
Use of NSAIDS and Low-Dose Aspirin
Inform patients not to use low-dose aspirin concomitantly with DYLOJECT until they talk to their healthcare provider [see Drug Interactions (7)].