Meloxicam: Package Insert and Label Information (Page 3 of 4)
8 USE IN SPECIFIC POPULATIONS
8.1 Pregnancy
Use of NSAIDs, including meloxicam, can cause premature closure of the fetal ductus arteriosus and fetal renal dysfunction leading to oligohydramnios and, in some cases, neonatal renal impairment. Because of these risks, limit dose and duration of meloxicam capsules use between about 20 and 30 weeks of gestation, and avoid meloxicam capsules use at about 30 weeks of gestation and later in pregnancy (see Clinical Considerations, Data).
Premature Closure of Fetal Ductus Arteriosus
Use of NSAIDs, including meloxicam capsules, at about 30 weeks gestation or later in pregnancy increases the risk of premature closure of the fetal ductus arteriosus.
Oligohydramnios/Neonatal Renal Impairment
Use of NSAIDs at about 20 weeks gestation or later in pregnancy has been associated with cases of fetal renal dysfunction leading to oligohydramnios, and in some cases, neonatal renal impairment.
Data from observational studies regarding other potential embryofetal risks of NSAID use in women in the first or second trimesters of pregnancy are inconclusive.
In animal reproduction studies, embryofetal death was observed in rats and rabbits treated during the period of organogenesis with meloxicam at oral doses equivalent 1- and 10-times, respectively, the maximum recommended daily dose (MRDD) of meloxicam capsules. Increased incidence of septal heart defects were observed in rabbits treated throughout embryogenesis with meloxicam at an oral dose equivalent to 116-times the MRDD. In pre- and post-natal reproduction studies, increased incidence of dystocia, delayed parturition, and decreased offspring survival were observed in rats treated with meloxicam at an oral dose equivalent to 0.12-times the MRDD of meloxicam capsules. No teratogenic effects were observed in rats treated with meloxicam during organogenesis at an oral dose equivalent to 3.9- times the MRDD [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 meloxicam, resulted in increased pre- and post-implantation loss. Prostaglandins also have been shown to have an important role in fetal kidney development. In published animal studies, prostaglandin synthesis inhibitors have been reported to impair kidney development when administered at clinically relevant doses.
The estimated background risk of major birth defects and miscarriage for the indicated population(s) is unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2% to 4% and 15% to 20%, respectively.
Clinical Considerations
Fetal/Neonatal Adverse Reactions
Premature Closure of Fetal Ductus Arteriosus:
Avoid use of NSAIDs in women at about 30 weeks gestation and later in pregnancy, because NSAIDs, including meloxicam capsules, can cause premature closure of the fetal ductus arteriosus (see Data).
Oligohydramnios/Neonatal Renal Impairment:
If an NSAID is necessary at about 20 weeks gestation or later in pregnancy, limit the use to the lowest effective dose and shortest duration possible. If meloxicam capsules treatment extends beyond 48 hours, consider monitoring with ultrasound for oligohydramnios. If oligohydramnios occurs, discontinue meloxicam capsules and follow up according to clinical practice (see Data).
Labor or Delivery:
There are no studies on the effects of meloxicam capsules during labor or delivery. In animal studies, NSAIDs, including meloxicam, inhibit prostaglandin synthesis, cause delayed parturition, and increase the incidence of stillbirth.
Human Data
Premature Closure of Fetal Ductus Arteriosus:
Published literature reports that the use of NSAIDs at about 30 weeks of gestation and later in pregnancy may cause premature closure of the fetal ductus arteriosus.
Oligohydramnios/Neonatal Renal Impairment:
Published studies and postmarketing reports describe maternal NSAID use at about 20 weeks gestation or later in pregnancy associated with fetal renal dysfunction leading to oligohydramnios, and in some cases, neonatal renal impairment. These adverse outcomes are seen, on average, after days to weeks of treatment, although oligohydramnios has been infrequently reported as soon as 48 hours after NSAID initiation. In many cases, but not all, the decrease in amniotic fluid was transient and reversible with cessation of the drug. There have been a limited number of case reports of maternal NSAID use and neonatal renal dysfunction without oligohydramnios, some of which were irreversible. Some cases of neonatal renal dysfunction required treatment with invasive procedures, such as exchange transfusion or dialysis.
Methodological limitations of these postmarketing studies and reports include lack of a control group; limited information regarding dose, duration, and timing of drug exposure; and concomitant use of other medications. These limitations preclude establishing a reliable estimate of the risk of adverse fetal and neonatal outcomes with maternal NSAID use. Because the published safety data on neonatal outcomes involved mostly preterm infants, the generalizability of certain reported risks to the full-term infant exposed to NSAIDs through maternal use is uncertain.
Animal data:
Meloxicam was not teratogenic when administered to pregnant rats during fetal organogenesis at oral doses up to 4 mg/kg/day (3.9-times the maximum recommended daily dose (MRDD) of 10 mg of meloxicam capsules based on body surface area [BSA] comparison). Administration of meloxicam to pregnant rabbits throughout embryogenesis produced an increased incidence of septal defects of the heart at an oral dose of 60 mg/kg/day (116-times the MRDD based on BSA comparison). The no effect level was 20 mg/kg/day (39-times the MRDD based on BSA comparison). In rats and rabbits, embryolethality occurred at oral meloxicam doses of 1 mg/kg/day and 5 mg/kg/day, respectively (1- and 10-times the MRDD based on BSA comparison) when administered throughout organogenesis.
Oral administration of meloxicam to pregnant rats during late gestation through lactation increased the incidence of dystocia, delayed parturition, and decreased offspring survival at meloxicam doses of 0.125 mg/kg/day or greater (0.12-times the MRDD based on BSA comparison).
8.2 Lactation
There are no human data available on whether meloxicam is present in human milk, or on the effects on breastfed infants, or on milk production. The developmental and health benefits of breastfeeding should be considered along with the mother’s clinical need for meloxicam capsules and any potential adverse effects on the breastfed infant from the meloxicam capsules or from the underlying maternal condition
Data
Animal data:
Meloxicam was excreted in the milk of lactating rats at concentrations higher than those in plasma.
8.3 Females and Males of Reproductive Potential
Females:
Based on the mechanism of action, the use of prostaglandin-mediated NSAIDs, including meloxicam, 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 meloxicam, in women who have difficulties conceiving or who are undergoing investigation of infertility.
8.4 Pediatric Use
The safety and effectiveness of meloxicam capsules in pediatric patients has not been established.
8.5 Geriatric Use
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)]. Of the total number of patients in clinical studies of meloxicam capsules, 291 were age 65 and over. No overall differences in safety or effectiveness were observed between these subjects and younger subjects, and other reported clinical experience has not identified differences in responses between the elderly and younger patients, but greater sensitivity of some older individuals cannot be ruled out.
8.6 Hepatic Impairment
No dose adjustment is necessary in patients with mild to moderate hepatic impairment. Patients with severe hepatic impairment have not been adequately studied. Because meloxicam is significantly metabolized in the liver; use meloxicam capsules in patients with severe hepatic impairment only if the benefits are expected to outweigh the risks. If meloxicam capsules are used in patients with severe hepatic impairment, monitor patients for signs of worsening liver function [see Warnings and Precautions (5.3), Clinical Pharmacology (12.3)].
8.7 Renal Impairment
No dose adjustment is necessary in patients with mild to moderate renal impairment. Patients with severe renal impairment have not been studied. The use of meloxicam capsules in subjects with severe renal impairment is not recommended. In a previous study, the free Cmax plasma concentrations following a single dose of meloxicam were higher in patients with renal failure on chronic hemodialysis (1% free fraction) in comparison to healthy volunteers (0.3% free fraction). Therefore, the maximum meloxicam capsules dosage in this population is 5 mg per day. Hemodialysis did not lower the total drug concentration in plasma; therefore, additional doses are not necessary after hemodialysis. Meloxicam is not dialyzable [see Warnings and Precautions (5.6), Clinical Pharmacology (12.3)].
10 OVERDOSAGE
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)].
There is limited experience with meloxicam overdose. In four reported cases of meloxicam overdose, patients took 6 to 11 times the highest available dose of meloxicam tablets (15 mg); all recovered. Cholestyramine is known to accelerate the clearance of meloxicam.
Manage patients with symptomatic and supportive care following an NSAID overdosage. There are no specific antidotes. Consider emesis and/or activated charcoal (60 to 100 grams in adults, 1 to 2 grams per kg of body weight in pediatric patients) and/or osmotic cathartic in symptomatic patients seen within four hours of ingestion or in patients with a large overdosage (5 to 10 times the recommended dosage). Accelerated removal of meloxicam by 4 g oral doses of cholestyramine given three times a day was demonstrated in a previous clinical trial. 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).
11 DESCRIPTION
Meloxicam Capsules are a nonsteroidal anti-inflammatory drug, available as yellow and green capsules containing 5 mg or 10 mg for oral administration. The chemical name is 4-Hydroxy-2-methyl-N -(5-methyl-2-thiazolyl)-2H -1,2-benzothiazine-3-carboxamide-1,1-dioxide. The molecular weight is 351.40. Its molecular formula is C14 H13 N3 O4 S2 , and it has the following chemical structure.
Meloxicam is a pale yellow powder, practically insoluble in water, with higher solubility observed in strong acids and bases. It is very slightly soluble in methanol. Meloxicam has a partition coefficient (Log P) = 2.662 ± 0.848 at 25°C. Meloxicam has pKa values of 1.1 and 4.2.
The inactive ingredients in meloxicam capsules include: crospovidone, lactose monohydrate, magnesium stearate, povidone and sodium lauryl sulfate. The capsule shells contain D & C Yellow No. 10, FD & C Blue No. 1, FD & C Red No. 40 (for 10 mg strength only), FD & C Yellow No. 6 (for 5 mg strength only), gelatin and titanium dioxide. The imprinting on the gelatin capsules is black edible ink which contains black iron oxide, potassium hydroxide, propylene glycol, shellac and titanium dioxide. The 5 mg capsules have a yellow opaque cap and yellow opaque body, imprinted with “LU” on cap and “M76” on body in black ink. The 10 mg capsules have a green opaque cap and green opaque body, imprinted with “LU” on cap and “M78” on body in black ink.
12 CLINICAL PHARMACOLOGY
12.1 Mechanism of Action
Meloxicam has analgesic, anti-inflammatory, and antipyretic properties.
The mechanism of action of meloxicam, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2).
Meloxicam is a potent inhibitor of prostaglandin synthesis in vitro. Meloxicam 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 meloxicam is an inhibitor of prostaglandin synthesis, its mode of action may be due to a decrease of prostaglandins in peripheral tissues.
12.3 Pharmacokinetics
The relative bioavailability of meloxicam 10 mg capsules compared to meloxicam 15 mg tablets was assessed in 28 healthy subjects under fasted and fed conditions in a single-dose crossover study.
Meloxicam 10 mg capsules do not result in an equivalent systemic exposure compared to 15 mg meloxicam tablets. When taken under fasted conditions, a 33% lower dose of meloxicam in meloxicam 10 mg capsules resulted in a 33% lower overall systemic exposure (AUCinf ) and a comparable mean peak plasma concentration (Cmax ) to meloxicam 15 mg tablets. The median time to maximum plasma concentration (Tmax ) occurred earlier for meloxicam capsules (2 hours for both 5 mg and 10 mg) than for meloxicam tablets (4 hours for 15 mg).
Absorption
Single oral doses of meloxicam capsules 5 mg and 10 mg were associated with dose-proportional pharmacokinetics. Mean Cmax was achieved within 2 hours post-dose for both meloxicam capsules 5 mg and 10 mg capsules when taken under fasted conditions. A second meloxicam concentration peak occurs around 8 hours post-dose.
Taking meloxicam capsules with food causes a decrease in the rate but not the overall extent of systemic meloxicam absorption compared with taking meloxicam capsules on an empty stomach. Meloxicam capsules administered under fed conditions results in 22% lower mean Cmax and a 3 hour delay in median Tmax (5 hours for fed versus 2 hours for fasted) compared to the fasted condition. Significant changes in AUCinf were not observed. Meloxicam capsules can be administered without regard to timing of meals.
Distribution
The mean volume of distribution (Vss) of meloxicam is approximately 10 L. Meloxicam is ~99.4% bound to human plasma proteins (primarily albumin) within the therapeutic dose range. The fraction of protein binding is independent of drug concentration, over the clinically relevant concentration range, but decreases to ~99% in patients with renal disease. Meloxicam penetration into human red blood cells, after oral dosing, is less than 10%.
Following a radiolabeled dose, over 90% of the radioactivity detected in the plasma was present as unchanged meloxicam.
Meloxicam concentrations in synovial fluid, after a single oral dose, range from 40% to 50% of those in plasma. The free fraction in synovial fluid is 2.5 times higher than in plasma, due to the lower albumin content in synovial fluid as compared to plasma. The significance of this penetration is unknown.
Elimination
Metabolism:
Meloxicam is extensively metabolized in the liver. Meloxicam metabolites include 5′-carboxy meloxicam (60% of dose), from P-450 mediated metabolism formed by oxidation of an intermediate metabolite 5′-hydroxymethyl meloxicam which is also excreted to a lesser extent (9% of dose). In vitro studies indicate that CYP2C9 (cytochrome P450 metabolizing enzyme) plays an important role in this metabolic pathway with a minor contribution of the CYP3A4 isozyme. Patients’ peroxidase activity is probably responsible for the other two metabolites which account for 16% and 4% of the administered dose, respectively. The four metabolites are not known to have any in vivo pharmacological activity.
Excretion:
Meloxicam excretion is predominantly in the form of metabolites, and occurs to equal extents in the urine and feces. Only traces of the unchanged parent compound are excreted in the urine (0.2%) and feces (1.6%). The extent of the urinary excretion was confirmed for unlabeled multiple 7.5 mg doses: 0.5%, 6%, and 13% of the dose were found in urine in the form of meloxicam, and the 5′-hydroxymethyl and 5′-carboxy metabolites, respectively. There is significant biliary and/or enteral secretion of the drug. This was demonstrated when oral administration of cholestyramine following a single IV dose of meloxicam decreased the AUC of meloxicam by 50%. The mean elimination half-life (t1/2 ) for meloxicam capsules 5 mg and 10 mg is approximately 22 hours.
Specific Populations
Pediatric: The pharmacokinetics of meloxicam capsules have not been investigated in pediatric patients.
Hepatic Impairment: Following a single 15 mg dose of meloxicam tablets there was no marked difference in plasma concentrations in patients with mild (Child-Pugh Class I) or moderate (Child-Pugh Class II) hepatic impairment compared to healthy volunteers. Protein binding of meloxicam was not affected by hepatic impairment. No dosage adjustment is necessary in patients with mild to moderate hepatic impairment. Patients with severe hepatic impairment (Child-Pugh Class III) have not been adequately studied [see Warnings and Precautions (5.3), Use in Specific Populations (8.6)].
Renal Impairment: Meloxicam pharmacokinetics have been investigated in subjects with mild and moderate renal impairment. Total drug plasma concentrations of meloxicam decreased and total clearance of meloxicam increased with the degree of renal impairment while free AUC values were similar in all groups. The higher meloxicam clearance in subjects with renal impairment may be due to increased fraction of unbound meloxicam which is available for hepatic metabolism and subsequent excretion. No dosage adjustment is necessary in patients with mild to moderate renal impairment. Patients with severe renal impairment have not been adequately studied. The use of meloxicam capsules in subjects with severe renal impairment is not recommended.
Following a single dose of meloxicam, the free Cmax plasma concentrations were higher in patients with renal failure on chronic hemodialysis (1% free fraction) in comparison to healthy volunteers (0.3% free fraction). Hemodialysis did not lower the total drug concentration in plasma; therefore, additional doses are not necessary after hemodialysis. Meloxicam is not dialyzable [see Warnings and Precautions (5.6) , Use in Specific Populations (8.7) ].
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 3 clinically significant drug interactions of NSAIDs with aspirin [see Drug Interactions (7) ].
Cholestyramine: Pretreatment for four days with cholestyramine significantly increased the clearance of meloxicam by 50%. This resulted in a decrease in t1/2 , from 19.2 hours to 12.5 hours, and a 35% reduction in AUC. This suggests the existence of a recirculation pathway for meloxicam in the gastrointestinal tract. The clinical relevance of this interaction has not been established.
Cimetidine: Concomitant administration of 200 mg cimetidine four times daily did not alter the single-dose pharmacokinetics of 30 mg meloxicam.
Digoxin: Meloxicam tablets 15 mg once daily for 7 days did not alter the plasma concentration profile of digoxin after β-acetyldigoxin administration for 7 days at clinical doses. In vitro testing found no protein binding drug interaction between digoxin and meloxicam [see Drug Interactions (7) ].
Lithium: In a study conducted in healthy subjects, mean pre-dose lithium concentration and AUC were increased by 21% in subjects receiving lithium doses ranging from 804 to 1072 mg twice daily with meloxicam tablets 15 mg once per day every day as compared to subjects receiving lithium alone [see Drug Interactions (7) ].
Methotrexate: A previous study in 13 rheumatoid arthritis (RA) patients evaluated the effects of multiple doses of meloxicam on the pharmacokinetics of methotrexate taken once weekly. Meloxicam did not have a significant effect on the pharmacokinetics of single doses of methotrexate. In vitro, methotrexate did not displace meloxicam from its human serum binding sites [see Drug Interactions (7) ].
Warfarin: The effect of meloxicam tablets on the anticoagulant effect of warfarin was studied in a group of healthy subjects receiving daily doses of warfarin that produced an INR (International Normalized Ratio) between 1.2 and 1.8. In these subjects, meloxicam did not alter warfarin pharmacokinetics and the average anticoagulant effect of warfarin as determined by prothrombin time. However, one subject showed an increase in INR from 1.5 to 2.1. Caution should be used when administering meloxicam capsules with warfarin since patients on warfarin may experience changes in INR and an increased risk of bleeding complications when a new medication is introduced [see Drug Interactions (7) ].
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