Giardiasis

Giardiasis is an intestinal infection caused by Giardia lamblia, a microscopic parasite spread through contaminated water and food. It is one of the most common gut parasites worldwide and particularly prevalent across Southeast Asia, South Asia, and other regions where untreated water sources are used in food preparation.

Medicines used to treat Giardiasis

Albenza

Albendazole

400mg

Developed to manage parasitic worm infections to alleviate intestinal infestation.

From $0.47 / tablet View

Symptoms and what sets it apart

The infection typically causes persistent, greasy diarrhoea that floats, along with bloating, stomach cramps, nausea, and excessive wind. Fatigue is common. Unlike bacterial food poisoning, giardiasis tends to drag on for weeks rather than days, and some people carry the parasite without noticeable symptoms.

Clearing the infection

Giardiasis responds well to antiparasitic medicines. The most commonly used agents are tinidazole, which is often given as a single dose, and ornidazole, taken over a short course. Albendazole is a broader antiparasitic that is sometimes used where tinidazole-class medicines are unavailable. Staying well hydrated throughout treatment helps the gut recover, especially if diarrhoea has been prolonged.

Symptoms that do not improve after a full treatment course, or that include blood in the stool or a high fever, warrant prompt medical review.