Pharmacokinetic properties: Absorption Readily absorbed from GI tract. Peak plasma concentration: 60-90 min. Bioavailability 85%. Distribution: Protein-binding: 99% Plasma half-life 2 hours. Metabolism: Metabolised in the liver. Tolfenamic acid undergoes enterohepatic circulation. Excretion: Excreted in urine (90%) and faces.
Dosage & Administration
- Acute migraine attacks: 200 mg when symptoms appear may be repeated once after 1-2 hour.
- Mild to moderate pain: 100-200 mg tid
- Renal impairment: Dose adjustments may be needed.
- Severe renal impairment: Avoid.
Children: A pediatric dosage regimen has not yet been established.
Tolfenamic acid should be taken with food. Take water during or immediately after meals.