Classifications: antiprotozoal; Therapeutic: antiprotozoal
Pregnancy Category: B
100 mg/5 mL oral suspension; 500 mg tablets
Antiprotozoal activity believed to be due to interference with an essential enzyme needed for anaerobic energy metabolism
in protozoa. Interference with the enzyme may not be the only pathway by which nitazoxanide exhibits antiprotozoal activity.
Inhibits growth of sporozoites and oocysts of Cryptosporidium parvum and trophozoites of Giardia lamblia.
Treatment of diarrhea caused by Cryptosporidium parvum and Giardia lamblia.
Prior hypersensitivity to nitazoxanide.
Hepatic and biliary disease, renal disease, renal impairment, renal failure, and combined renal and hepatic disease; pregnancy
(category B); lactation. Safety and efficacy in children <1 y or >11 y have not been studied.
Route & Dosage
Adult: PO 500 mg q12h x 3 d
Child: PO 1247 mo, 100 mg q12h x 3 d; 411 y, 200 mg q12h x 3 d
- Prepare suspension as follows: Tap bottle until powder loosens. Draw up 48 mL of water, add half to bottle, shake to suspend
powder, then add remaining 24 mL of water and shake vigorously.
- Give required dose (5 or 10 mL) with food.
- Keep container tightly closed, and shake well before each administration.
- Suspension may be stored for 7 d at 15°30° C (59°86° F), after which any unused portion must
Adverse Effects (≥1%)CNS:
Abdominal pain, diarrhea
14 h. Distribution:
99% protein bound. Metabolism:
Rapidly hydrolyzed in liver to an active metabolite
, tizoxanide (desacetyl-nitazoxanide). Elimination:
In urine, bile, and feces.
Assessment & Drug Effects
- Monitor for therapeutic effectiveness: No watery stools and ≤2 soft stools
with no hematochezia within the past 24 h or no symptoms and no unformed stools within the past 48 h.
- Monitor closely patients with preexisting hepatic or biliary disease for adverse reactions.
- Assess appetite, level of abdominal discomfort and extent of bloating.
- Assess frequency and quantity of diarrhea and monitor total hydration status.
- Weigh daily to aid in assessment of possible fluid loss from diarrhea.
Patient & Family Education
- Note that 5 mL of the oral suspension contains approximately 1.5 g of sucrose.
- Report either no improvement in or worsening of diarrhea and abdominal discomfort.