What are the treatment options for giardiasis?

Giardiasis is an intestinal infection that can cause diarrhoea, cramps, bloating, nausea and tiredness. A GP consultation may review travel, food or water exposure, contact with other cases and the pattern of symptoms. A stool test can sometimes be used to confirm the infection.

A clinician may prescribe an antiparasitic medicine, sometimes described as antibiotic treatment, to clear the infection. The medicine and schedule depend on your medical history, other medicines and whether symptoms continue.

Drink frequent fluids, and consider oral rehydration advice if diarrhoea is heavy. Eat small, simple meals as tolerated. Wash hands thoroughly after using the toilet and before preparing food; clean bathroom surfaces and avoid preparing food for others while unwell.

Take the prescribed course as directed and check before using anti-diarrhoeal medicines. Temporary difficulty digesting dairy foods can occur after intestinal infections, so discuss ongoing symptoms rather than making long-term dietary changes alone.

Arrange medical advice if diarrhoea persists, returns after treatment, or causes weight loss or marked tiredness. Seek urgent help for blood in the stool, severe abdominal pain, confusion, fainting or signs of serious dehydration such as very little urine.

Ask whether a stool test is needed, which medicine is suitable, how to protect household contacts, and when persistent diarrhoea should be reassessed.