What it is used for
- Diarrhea caused by the parasites Giardia and Cryptosporidium
- Some other intestinal protozoal and worm infections
How it works
Nitazoxanide blocks an energy-producing step that many parasites depend on, which stops the parasites from surviving and clears the infection from the gut.
How it is taken
Taken as oral tablets or a liquid suspension, usually with food to improve absorption, as a short course. The tablet and liquid forms are not always interchangeable in young children, so use the form provided. Take it exactly as your doctor or pharmacist directs.
No doses here on purpose. The right strength and schedule depend on you — only a doctor or pharmacist should set them. Always follow your prescription and the label.
Common side effects
- Stomach pain
- Nausea
- Diarrhea
- Headache
- Yellow-green discoloration of urine (harmless)
Serious effects — get help
- Signs of a severe allergic reaction such as facial swelling or breathing difficulty — seek emergency care
- Severe or worsening abdominal pain — contact your clinician
- Signs of dehydration from ongoing diarrhea, such as little urine, dizziness, or extreme thirst — seek care
If a reaction is severe — for example trouble breathing, swelling of the face or throat, or collapse — go to the nearest emergency room now or call your local emergency number. Do not wait for an online consultation.
Interactions to watch
- Medicines that are highly bound to blood proteins (such as warfarin) — your clinician may monitor
- Generally few major interactions, but tell your clinician about all your medicines
Who should take care
- Take with food for best effect
- Tell your clinician about liver or kidney disease
- Inform your clinician if pregnant or breastfeeding
- Replace fluids if you have a lot of diarrhea
- Use the specific form prescribed for children