Giardiasis

It can be expected that parasites will be cleared from the stool in 3 to 5 days and that symptoms will resolve in 5 to 7 days.

If the symptoms do not abate, the patient should be evaluated for treatment failure, lactose intolerance, or postinfectious irritable bowel syndrome. Gastroenterology consultation can be considered for selected patients.

If resistance or relapse has occurred, treatment with a drug of a different class or combination therapy for at least 2 weeks should eradicate infection.