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Zox is indicated for the treatment of diarrhea caused by Cryptosporidium parvum, Giardia lamblia and Entamoeba histolytica.


Nitazoxanide is a synthetic antiprotozoal agent for oral administration. The antiprotozoal activity of Nitazoxanide is believed to be interference with the Pyruvate Ferredoxin Oxido Reductase (PFOR) enzyme-dependant electron transfer reaction. This reaction is essential for anaerobic energy metabolism of the protozoa. Nitazoxanide and its metabolites, tizoxanid are active in vitro in inhibiting the growth of sporozoites and oocyst of Cryptosporidium parvum and trophozoites of Giardia lamblia.

Dosage & Administration

Age 1-3 years: 1 tea-spoonfull or 5 ml suspension every 12 hours for 3 days.
Age 4-11 years: 2 tea-spoonfulls or 10 ml suspension every 12 hours for 3 days.
Age 12 years or above: 5 tea-spoonfulls (25 ml) suspension or 1 tablet every 12 hours for 3 days.

It is recommended to be administered with food.


It is highly bound to plasma protein. Therefore, caution should be exercised when administering Zox concurrently with other highly plasma protein-bound drugs with narrow therapeutic index.


It is contraindicated in patients with known hypersensitivity to Nitazoxanide or any components of the preparation.

Side Effects

The most frequent side effects, reported by Zox are abdominal pain, vomiting and headache. These side effects are typically mild and transient in nature. Very rare side effects include- nausea, anorexia, flatulence, increased appetite, enlarged salivary glands, increased creatinine & SGPT level, pruritus, rhinitis, sweating, dizziness, discolored urine etc.

Pregnancy & Lactation

US FDA pregnancy category of Nitazoxanide is B. There are, however, no adequate and well-controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed. Nitazoxanide have been shown to be excreted in human milk. So, caution should be exercised when Nitazoxanide is administered during lactation.

Precautions & Warnings

Zox must be administered with caution to patients with hepatic & biliary disease and to patients with renal disease.

Therapeutic Class

Anti-diarrhoeal Antiprotozoal

Storage Conditions

Keep in a dry place away from light and heat. Keep out of the reach of children.
Pack Image of Zox 500 mg Tablet Pack Image: Zox 500 mg Tablet