Dosage Calculator | FIP Treatment Dose & Cost by Weight

DOSAGE CALCULATOR — Dosage

Calculate the daily dose from body weight, instantly.

Enter the form, symptoms, and body weight, and the recommended injection and tablet doses are calculated automatically. The calculated values are a guide; always follow the veterinarian's judgment for the final dose.

Form / symptoms

Dry form

Wet form

Neuro / ocular

Body weight (kg)

* Injection reference: dry form 0.6 ml/kg / wet form 0.60 ml/kg / neuro-ocular 1.0 ml/kg.
* Oral tablet reference: dry & neuro-ocular 1 tablet per 2 kg / wet form 0.75 tablet per 2 kg.
* The standard total course is 84 days for every form (it is not shortened even if remission is seen).
* Use the higher of current and pre-illness body weight, and re-weigh weekly to recalculate.
* The calculated values are a guide. Always follow the veterinarian's judgment for the final dose.

DAILY DOSAGE

Injection (20 mg/ml) / days 1–15

2.10 ml / day

Oral tablet (60 mg) / day 16 onward

1.75 tab / day

Recommended treatment period

84 days (standard)

FULL COURSE — Total amount & medication cost

For the dry-form 84-day protocol

Total injections used

6 vials

Total tablets consumed

138 tab

Total medication cost (est.)

~$997

6 injections × ~$24 + 138 tablets × ~$7

DURING TREATMENT — What to Watch For

Reading the response after treatment begins.

Drawing on our experience supporting treatment, here are two points we especially want owners to know. Both are intended to be shared and discussed with your attending veterinarian.

When there's no improvement after a few days

Once injections begin, most cases start improving within the same day to a few days. Returning appetite, a falling temperature, and renewed activity are usually the first signs.

The situation to watch most closely is new neurological or ocular signs appearing during treatment. If you see hind-limb weakness, seizures, circling, or uveitis (clouding or colour change in the eye), treat the case as the neurological form regardless of the original form and increase the injection to 0.8–1.0 ml/kg immediately.

If several days pass with no improvement at all, the dose may also be insufficient for the cat's build or disease severity. In either case, discuss any increase with your veterinarian.

Do not reduce the dose as the cat improves. Where neurological or ocular signs are involved, virus can persist in the brain and eyes even after appetite and energy return. Reducing or stopping on the basis of apparent recovery invites relapse — maintain the higher dose and complete the full course.

When anaemia is progressing

If anaemia worsens during treatment, the cause may not be FIP itself but a concurrent condition. Missing this can stall treatment progress.

Where progressive anaemia is seen, please ask your veterinarian about the following tests.

Haemoplasma (feline infectious anaemia) testing
Usually confirmed by PCR. If positive, concurrent antibiotic treatment is required.
Immune-mediated haemolytic anaemia (IMHA) testing
A condition in which the immune system destroys red blood cells. It calls for a different approach, such as immunosuppressive therapy.

Regular blood work helps. Tracking haematocrit (PCV) and liver values through treatment makes it possible to catch these changes early.

⚠ Please note The information on this page reflects what we have learned through supporting treatment; it does not replace diagnosis or clinical decision-making. Any change in dose, additional testing, or treatment of a concurrent condition should follow the diagnosis and instructions of your attending veterinarian. Responses vary between individuals, and the same course cannot be guaranteed for every cat.