Coccidiosis Dosage Calculator (Toltrazuril, Amprolium & More)

Choose your animal, the drug substance, and a body weight to see typical published reference figures for anti-coccidial dosing. This is an educational reference — it does not diagnose disease or recommend any product, and several of these drugs are not FDA-approved for animals in the U.S. A licensed veterinarian must confirm the diagnosis and the exact dose before any treatment.

Anti-coccidial dosage reference

Reference

Animal

Medication

Goal

Body weight

Solution strength (mg/mL) — a common strength; change to match any product

Educational reference only — not a prescription. These are typical published label / reference figures, shown for information. They are not a recommendation to use any specific product, and several of these drugs are not FDA-approved for animals in the U.S. Coccidiosis must be diagnosed by a veterinarian, who determines whether treatment is appropriate and confirms the exact dose, frequency, and any withdrawal time.

How to use it

Pick the animal. The available medications update to those appropriate for that species.
Pick the medication and goal. Some drugs offer both a treatment and a prevention rate.
Enter body weight in pounds or kilograms — as accurately as you can.
Check the product strength. It's pre-filled to the matching Vetr product; change it if your product differs.
Calculate, then take the figures to your vet to confirm before dosing.

Reference doses used

For transparency, these are the reference figures behind the calculator. They are typical published values and can differ for your product or region:

Drug	Example reference dose	Notes
Toltrazuril	~20 mg/kg single dose (goats, sheep, piglets); ~15 mg/kg (calves)	Hits all life stages; usually one dose
Amprolium	~10 mg/kg/day × 5 days (treat); ~5 mg/kg/day × 21 days (prevent) in cattle	Give thiamine after; 24 h withdrawal
Sulfadimethoxine	~55 mg/kg day 1, then ~27.5 mg/kg/day (dogs, cats)	Loading dose then maintenance
Diclazuril	~1 mg/kg	Single dose, sometimes repeated

Please read before dosing

This tool is educational. It does not diagnose disease or account for your animal's specific health, other medications, pregnancy, or local regulations. Overdosing can harm animals and some drugs carry meat or milk withdrawal times. Always confirm with a licensed veterinarian and the exact product label.

Frequently asked questions

How does the dosage calculator work?

You choose the animal, medication, and goal, then enter body weight and the product strength. The tool multiplies the reference mg/kg dose by the weight to estimate the total dose, and divides by the product concentration to estimate a volume in millilitres.

Where do the dosing figures come from?

They are typical published label and reference doses — drawn from sources such as the Merck Veterinary Manual and the published labels for approved amprolium and sulfadimethoxine products, plus peer-reviewed veterinary literature. They are starting points for discussion, not a prescription.

Is this a substitute for a veterinarian?

No. Diagnosis, drug choice, exact dose, and withdrawal times must be confirmed by a licensed veterinarian and the product label. Doses vary by product, region, and the individual animal.

Anti-coccidial dosage calculator