Nitazoxanide pediatric dose calculator
Use this Nitazoxanide pediatric dose calculator to match the prescribed child dose to the exact liquid, tablet, or capsule strength before you give it.
dose calculator basics
Nitazoxanide pediatric dose calculator details
Use this Nitazoxanide calculator as the fast parent page for weight-based dose checks, mL conversion, common strengths, and the practical safety steps that generic calculator sites often skip.
Formula
mL per dose = (child weight in kg x prescribed mg/kg/day / doses per day) / medication concentration in mg per mL.
Worked example
For a 20 kg child using 15 mg/kg/day divided 2 times daily with 100 mg/5 mL, calculate the daily mg target, divide by the schedule, then convert that mg amount into mL for the selected product.
Safety checks before using the result
- Use the exact product strength in hand before measuring the dose.
- Confirm maximum dose, age limits, and indication-specific cautions when they apply.
- Escalate urgent symptoms or medication reactions instead of repeating doses from calculator output alone.
Practical dosing guide
Before you measure the dose
Use this page to match the prescribed Nitazoxanide plan to the exact liquid or tablet strength before the first dose.
- What it is usually used for
- Nitazoxanide is a thiazolide antimicrobial that treats protozoal diarrhea such as cryptosporidiosis and giardiasis in children.
- Common forms
- Common forms include 100 mg/5 mL suspension, 500 mg tablet, and 100 mg/5 mL oral liquid.
- How the schedule is usually written
- Many outpatient plans are given twice daily for 3 days.
Nitazoxanide pediatric medication summary
Nitazoxanide is a thiazolide antimicrobial that treats protozoal diarrhea such as cryptosporidiosis and giardiasis in children.
Nitazoxanide covers Cryptosporidium and Giardia and retains in vitro activity against several enteric viruses, giving clinicians a single agent that addresses mixed-infection diarrhea while families continue oral rehydration per CDC guidance.
Label dosing lasts three days, yet real-world practice sometimes extends therapy to 5–7 days for persistent shedding; document reassessment plans and obtain stool testing if symptoms fail to improve after the initial course.
Nitazoxanide indications and common pediatric uses
Nitazoxanide is an antiparasitic approved for pediatric cryptosporidiosis and is a practical option for giardiasis when taste or resistance limits metronidazole use.
Cryptosporidiosis (immunocompetent)
Cryptosporidiosis (immunocompetent): Most immunocompetent children improve within a week; investigate mixed infections if not.
Giardiasis
Giardiasis: Consider testing household contacts in outbreak settings.
Cryptosporidiosis in immunocompromised children
Cryptosporidiosis in immunocompromised children: Use in consultation with infectious diseases and HIV/transplant teams.
Nitroimidazole-resistant giardiasis
Nitroimidazole-resistant giardiasis: Evaluate for reinfection or mixed pathogens.
Refractory Clostridioides difficile infection
Refractory Clostridioides difficile infection: Reserve for refractory cases in consultation with ID.
How to give Nitazoxanide
- Administration tips for nitazoxanide in children.
- Add 48 mL of water to the bottle as instructed by the pharmacist, shake vigorously until homogenous, and use an oral syringe to measure each mL. Have adolescents swallow tablets whole with food; do not crush due to bitterness. Rinse the syringe after dosing and recap the bottle tightly to maintain stability.
- Powder requires 48 mL of water for reconstitution; shake before every dose.
- Swallow whole with food; do not crush or split due to bitterness and film coating.
Nitazoxanide side effects, contraindications, and interactions
Nitazoxanide is generally well tolerated when paired with food and consistent hydration, but gastroenteritis symptoms can overlap with medication effects. The most common adverse events are self-limited nausea, abdominal discomfort, and headache. Yellow-green urine or mild scleral tint can be benign, while dark urine, right-upper-quadrant pain, or worsening fatigue should trigger urgent evaluation.
Common side effects
- Always give doses with food (preferably a meal containing fat) to cut nausea in half and improve absorption.
- Pair every episode of loose stool or emesis with oral rehydration solution—10 mL/kg for mild diarrhea and up to 20 mL/kg for ongoing vomiting.
- Explain that bright yellow urine or scleral tint is common; escalate care only if the child also has dark urine, clay-colored stools, or abdominal pain.
Safety checks
- Moderate-to-severe hepatic impairment: Hepatic metabolism can increase exposure.
- Severe renal impairment: Limited data on accumulation.
- Facial swelling, wheezing, or throat tightness: Possible hypersensitivity reaction.
- Jaundice or dark urine: Possible hepatotoxicity.
- Severe dehydration or inability to keep fluids down: Risk of dehydration complications.
Drug interactions
- Review the full medication list with a clinician or pharmacist before combining therapies.
Nitazoxanide mechanism and clinical pearls
Nitazoxanide is rapidly deacetylated to tizoxanide, a broad-spectrum thiazolide that disrupts anaerobic energy metabolism and interferes with viral protein maturation.
Tizoxanide exposure jumps when the suspension is taken with food. Ask families to pair doses with breakfast and dinner, and note the meal requirement on the prescription label to avoid empty-stomach failures.
Even when diarrhea improves quickly, continue oral rehydration solutions for 24 hours and track stool frequency. Sudden worsening may signal refractory Cryptosporidium or bacterial co-infection requiring reassessment.
Children with HIV, transplant history, or chemotherapy often need longer courses or combination therapy. Alert infectious disease if diarrhea persists beyond 5 days or CD4 counts are low.
Reconstituted suspension expires in 7 days at room temperature. Write the discard date on the bottle, set a phone reminder, and instruct families to request a refill before the course lapses if prolonged therapy is planned.
Adding EHR prompts to document reconstitution and discard-date instructions improves dispensing and caregiver execution reliability.
Frequently asked questions about Nitazoxanide
The suspension absorbs much better when fat is present in the stomach. A meal can double the amount of active medicine in the bloodstream, which helps it clear parasites faster and reduces stomach upset. Pair each dose with breakfast and dinner and encourage sips of oral rehydration solution afterward.
Give it as soon as you remember unless the next dose is less than 4 hours away. If you are close to the next scheduled dose, skip the missed one and return to the regular schedule. Do not double up doses. Nitazoxanide works best when doses are spaced about 12 hours apart for the full three-day course.
Many children produce fewer stools within 24–48 hours, but full recovery can take several days depending on hydration and immune status. Continue offering oral rehydration solution, track urine output, and contact your clinician if stool frequency stays high after the third treatment day or if new fever or blood in the stool appears.
Most childcare centers require children to be fever-free and have improving stool consistency before returning. Because Cryptosporidium and Giardia spread through stool, keep your child home until diarrhea has stopped for at least 24 hours, and remind them to wash hands well after the bathroom for one additional week.
Brightly colored urine is a harmless effect of the metabolites. It should fade a few days after treatment ends. Call your care team if you also notice yellowing of the eyes or skin, dark cola-colored urine, or persistent abdominal pain—those symptoms warrant liver enzyme checks.
Try small, frequent sips of oral rehydration solution and bland foods such as toast, rice, or bananas with each dose. If vomiting every dose or signs of dehydration appear (very little urine, dry mouth, lethargy), seek medical attention right away for possible IV fluids before continuing therapy.
Sources reviewed for Nitazoxanide
cdc-crypto-2024
dailymed-nitazoxanide-2024
cdc-giardia-2024
statpearls-nitazoxanide-2024
nih-crypto-2024
idsa-giardiasis-2023