It should be taken at least 1hr before meals.
Headache and abdominal pain which is not usually serious. Though some people experience serious side effects like muscle spasm, irregular heartbeats, rash, seizures.
Ketoconazole, ampicillin, ciprofloxacin, clozapine, digoxin, ferrous fumarate, warfarin, imipramine, erlotinib.