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Mefenamic acid
Mefenamic acid (Ponstan)
Mefenamic Acid
(meh-fen-NAM-ick AH-sid)
Pregnancy Category: C Apo-Mefenamic Nu-Mefenamic PMS-Mefenamic Acid Ponstan Ponstel (Rx)

Classification: Nonsteroidal, anti-inflammatory drug

See Also: See also Nonsteroidal Anti-Inflammatory Drugs.

Action/Kinetics: Inhibits prostaglandin synthesis. Is an anti-inflammatory, antipyretic, and analgesic. Peak plasma levels: 2-4 hr; t1/2: 2-4 hr; duration: 4-6 hr. Slowly absorbed from the GI tract, metabolized by the liver, and excreted in the urine and feces.

Uses: Short-term relief ( < 1 week) of mild to moderate pain (e.g., pain associated with tooth extraction and musculoskeletal disorders). Primary dysmenorrhea. Investigational: PMS, sunburn.

Contraindications: Ulceration or chronic inflammation of the GI tract, pregnancy or possibility thereof, children under 14, and hypersensitivity to the drug.

Special Concerns: Dosage has not been established in children less than 14 years of age. Use with caution in clients with impaired renal or hepatic function, asthma, or clients on anticoagulant therapy.

Additional Side Effects: Autoimmune hemolytic anemia if used more than 12 months. Diarrhea may be significant. Rash (maculopapular type).

Laboratory Test Alterations: False + test for urinary bile using diazo tablets.

Drug Interactions: Anticoagulants / Hypoprothrombinemia R/T plasma protein binding Insulin / Insulin requirement Lithium / Lithium plasma levels

How Supplied: Capsule: 250 mg

Dosage
•Capsules Analgesia, primary dysmenorrhea.
Adults and children over 14 years of age, initial: 500 mg; then, 250 mg q 6 hr.

 
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