Allergic conditions: 4 mg tid. Usual: 12-16 mg/day in 3-4 divided doses. Max: 32 mg/day.
Prevention and treatment of migraine and other vascular headaches: 4 mg, may repeat 30 min later. Not to exceed 8 mg w/in a 4- to 6-hr period. Maintenance: 4 mg 4-6 hrly.
Adverse drug reactions
: confusion, disturbed coordination, dizziness, excitation, euphoria, hallucinations, headache, insomnia, irritability, nervousness, restlessness, sedation, seizure, sleepiness, tremor, vertigo, hypotension, palpitation, tachycardia, abdominal pain, anorexia, increased appetite, constipation, diarrhoea, nausea, vomiting, hepatitis, hepatic failure, jaundice.
CIMS Drug Information System. Internet. Accessed on January 10, 2016.