Isotretinoin Cumulative Dose Calculator
Track Accutane treatment progress. Calculates total cumulative dosage (mg/kg) against the 120-150mg target range based on patient weight and daily intake.
About
Isotretinoin (Accutane) therapy relies on reaching a specific cumulative dosage to minimize the risk of acne relapse. Dermatologists typically aim for a total range of 120 mg to 150 mg per kilogram of body weight over the course of treatment. This calculator helps patients and providers track progress toward this goal. By inputting the daily dosage and treatment duration, it visualizes exactly how far along the patient is, helping to estimate the remaining time needed to complete the course.
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cumulative dose
Formulas
The cumulative dose is the sum of all medication taken divided by body weight.
Cum. Dose = Daily Dose × DaysWeight (kg)
The goal is:
120 ≤ Cum. Dose ≤ 150
Reference Data
| Patient Weight | Min Target (120mg/kg) | Max Target (150mg/kg) | Avg Duration (40mg/day) |
|---|---|---|---|
| 50 kg (110 lbs) | 6,000 mg | 7,500 mg | 5 - 6 Months |
| 60 kg (132 lbs) | 7,200 mg | 9,000 mg | 6 - 7 Months |
| 70 kg (154 lbs) | 8,400 mg | 10,500 mg | 7 - 8 Months |
| 80 kg (176 lbs) | 9,600 mg | 12,000 mg | 8 - 10 Months |
| 90 kg (198 lbs) | 10,800 mg | 13,500 mg | 9 - 11 Months |
Frequently Asked Questions
Clinical studies have shown that patients who reach a cumulative dose of at least 120mg/kg have significantly lower relapse rates compared to those who stop earlier, even if their skin looks clear.
Missing a single dose is usually not critical. The therapy is about the total accumulation over months, not daily precision. Simply continue as prescribed; do not double dose to catch up.