*Consult your veterinarian for the appropriate dosage level for your cat.
Daily Dosage Required:
0.00 ml
How to Use the FIP Dosage Calculator
Calculating the correct amount of GS-441524 is critical for the effective treatment of Feline Infectious Peritonitis (FIP). This calculator helps caregivers determine the precise volume (in ml) needed for daily injections or oral doses based on the cat's weight and the type of FIP being treated.
Standard Dosage Guidelines
While every cat is different, the veterinary community has established standard starting points for GS-441524 treatment (usually an 84-day cycle):
Wet FIP: 5-6 mg/kg
Dry FIP: 6-8 mg/kg
Ocular FIP: 8-10 mg/kg (specifically when the eyes are affected)
Neurological FIP: 10-12 mg/kg (when the virus crosses the blood-brain barrier)
The Calculation Formula
The math behind the calculator follows this clinical formula:
(Cat Weight in kg × Required Dosage mg/kg) ÷ Concentration of GS (mg/ml) = Daily Dose in ml
Example Calculation
If you have a cat weighing 4kg diagnosed with Wet FIP using a 15mg/ml concentration vial:
1. Weight: 4kg
2. Dosage Target: 5 mg/kg
3. Total mg needed: 4kg × 5mg/kg = 20mg
4. Volume in ml: 20mg ÷ 15mg/ml = 1.33ml per day
⚠️ Important Note:
Always weigh your cat weekly. FIP treatment often results in rapid weight gain as the cat recovers. You must adjust the dosage immediately as the weight increases to prevent under-dosing, which can lead to viral resistance or relapse.
function calculateFipDosage() {
var weightInput = document.getElementById('catWeight').value;
var weightUnit = document.getElementById('weightUnit').value;
var concentration = parseFloat(document.getElementById('gsConcentration').value);
var dosageMgKg = parseFloat(document.getElementById('dosageLevel').value);
var resultDiv = document.getElementById('fipResult');
var mlOutput = document.getElementById('mlOutput');
var summaryText = document.getElementById('dosageSummary');
if (weightInput === "" || weightInput <= 0) {
alert("Please enter a valid weight for your cat.");
return;
}
var weight = parseFloat(weightInput);
var weightInKg;
// Convert to KG if lbs is selected
if (weightUnit === 'lbs') {
weightInKg = weight * 0.453592;
} else {
weightInKg = weight;
}
// Calculation: (Weight in kg * Dosage level) / Concentration
var totalMgNeeded = weightInKg * dosageMgKg;
var mlRequired = totalMgNeeded / concentration;
// Formatting output
var finalMl = mlRequired.toFixed(2);
var finalKg = weightInKg.toFixed(2);
mlOutput.innerText = finalMl + " ml";
summaryText.innerText = "Based on " + finalKg + " kg body weight at " + dosageMgKg + " mg/kg dosage.";
// Show results
resultDiv.style.display = 'block';
// Scroll to result for mobile users
resultDiv.scrollIntoView({ behavior: 'smooth', block: 'nearest' });
}