NITAZOXANIDE
| NITAZOXANIDE (nit-a-zox'-a-nide) Alinia Classifications: antiprotozoal; Therapeutic: antiprotozoal Prototype: Metronidazole Pregnancy Category: B |
Availability
100 mg/5 mL oral suspension; 500 mg tablets
Action
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.
Therapeutic Effect
Inhibits growth of sporozoites and oocysts of Cryptosporidium parvum and trophozoites of Giardia lamblia.
Uses
Treatment of diarrhea caused by Cryptosporidium parvum and Giardia lamblia.
Contraindications
Prior hypersensitivity to nitazoxanide.
Cautious Use
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
| Diarrhea Adult: PO 500 mg q12h x 3 d Child: PO 12–47 mo, 100 mg q12h x 3 d; 4–11 y, 200 mg q12h x 3 d |
Administration
Oral- 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 be discarded.
Adverse Effects (≥1%)
CNS: Headache. GI: Abdominal pain, diarrhea, vomiting.Interactions
Food: Increases levels.Pharmacokinetics
Peak: 1–4 h. Distribution: 99% protein bound. Metabolism: Rapidly hydrolyzed in liver to an active metabolite, tizoxanide (desacetyl-nitazoxanide). Elimination: In urine, bile, and feces.Nursing Implications
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.
Common adverse effects in italic, life-threatening effects underlined; generic names in bold; classifications in SMALL CAPS; 
Canadian drug name; 
Prototype drug