Indomethacin

Brand Names: Indomethacin

Drug Class: Nonsteroidal Anti-inflammatory Drug

Overview

11 DESCRIPTION Indomethacin Capsules, USP are nonsteroidal anti-inflammatory drugs, available as capsules containing 25 mg and 50 mg of indomethacin, USP, administered for oral use. The chemical name is 1-( p -chlorobenzoyl)-5-methoxy-2-methylindole-3-acetic acid. The molecular weight is 357.79 g/mol. Its molecular formula is C 19 H 16 ClNO 4 , and it has the following chemical structure.

Mechanism of Action

12 CLINICAL PHARMACOLOGY 12.1 Mechanism of Action Indomethacin has analgesic, anti-inflammatory, and antipyretic properties. The mechanism of action of indomethacin capsules, like that of other NSAIDs, is not completely understood but involves inhibition of cyclooxygenase (COX-1 and COX-2). Indomethacin is a potent inhibitor of prostaglandin synthesis in vitro . Indomethacin 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 indomethacin is an inhibitor of prostaglandin synthesis, its mode of action may be due to a decrease of prostaglandins in peripheral tissues. 12.

Indications

  • 1 INDICATIONS AND USAGE Indomethacin capsules are indicated for: Moderate to severe rheumatoid arthritis including acute flares of chronic disease Moderate to severe ankylosing spondylitis Moderate to severe osteoarthritis Acute painful shoulder (bursitis and/or tendinitis) Acute gouty arthritis Indomethacin capsules are nonsteroidal anti-inflammatory drug indicated for: Moderate to severe rheumatoid arthritis including acute flares of chronic disease Moderate to severe ankylosing spondylitis Moderate to severe osteoarthritis Acute painful shoulder (bursitis and/or tendinitis) Acute gouty...

Common Doses

  • 25 mg
  • 150 mg
  • 50 mg
  • 200 mg

Dosage

2 DOSAGE AND ADMINISTRATION Use the lowest effective dosage for shortest duration consistent with individual patient treatment goals. ( 2.1 ) The dosage for moderate to severe rheumatoid arthritis including acute flares of chronic disease; moderate to severe ankylosing spondylitis; and moderate to severe osteoarthritis is indomethacin capsules 25 mg two or three times a day. ( 2.2 ) The dosage for acute painful shoulder (bursitis and/or tendinitis) is 75 to 150 mg daily in 3 or 4 divided doses. ( 2.3 ) The dosage for acute gouty arthritis is indomethacin capsules 50 mg three times a day. ( 2.

Black Box Warning

WARNING: RISK OF SERIOUS CARDIOVASCULAR AND GASTROINTESTINAL EVENTS WARNING: RISK OF SERIOUS CARDIOVASCULAR AND GASTROINTESTINAL EVENTS See full prescribing information for complete boxed warning. Nonsteroidal anti-inflammatory drugs (NSAIDs) cause an increased risk of serious cardiovascular thrombotic events, including myocardial infarction and stroke, which can be fatal. This risk may occur early in treatment and may increase with duration of use ( 5.1 ) Indomethacin capsules are contraindicated in the setting of coronary artery bypass graft (CABG) surgery ( 4 , 5.

Contraindications

  • 4 CONTRAINDICATIONS Indomethacin capsules are contraindicated in the following patients: Known hypersensitivity (e.g., anaphylactic reactions and serious skin reactions) to indomethacin or any components of the drug product [see Warnings and Precautions ( 5.7 , 5.9) ] . History of asthma, urticaria, or other allergic-type reactions after taking aspirin or other NSAIDs. Severe, sometimes fatal, anaphylactic reactions to NSAIDs have been reported in such patients [see Warnings and Precautions ( 5.7 , 5.8) ] .

Side Effects

  • 6 ADVERSE REACTIONS The following adverse reactions are discussed in greater detail in other sections of the labeling: Cardiovascular Thrombotic Events [see Warnings and Precautions ( 5.1 )] GI Bleeding, Ulceration and Perforation [see Warnings and Precautions ( 5.2 )] Hepatotoxicity [see Warnings and Precautions ( 5.3 )] Hypertension [see Warnings and Precautions ( 5.4 )] Heart Failure and Edema [see Warnings and Precautions ( 5.5 )] Renal Toxicity and Hyperkalemia [see Warnings and Precautions ( 5.6 )] Anaphylactic Reactions [see Warnings and Precautions ( 5.

Interactions

  • 7 DRUG INTERACTIONS See Table 2 for clinically significant drug interactions with indomethacin. Table 2 Clinically Significant Drug Interactions with Indomethacin Drugs That Interfere with Hemostasis Clinical Impact: Indomethacin and anticoagulants such as warfarin have a synergistic effect on bleeding. The concomitant use of indomethacin and anticoagulants have an increased risk of serious bleeding compared to the use of either drug alone. Serotonin release by platelets plays an important role in hemostasis.