Which statement about isotretinoin dosing is true?

• A. High daily dose is always more effective with fewer side effects.
• B. Low daily dose may have equal long-term efficacy with fewer side effects.
• C. Isotretinoin can only be used in high doses.
• D. Dosing has no impact on outcome.

Answer: (B)

The main concept is that the total amount of isotretinoin the patient receives over the course of treatment (the cumulative dose) often drives long-term outcomes more than the daily dose itself. While higher daily doses can clear acne more quickly, they also raise the risk and severity of side effects. Evidence shows you can achieve similar long-term efficacy by using a lower daily dose if you extend the treatment enough to reach an effective cumulative dose (roughly in the range of 120–150 mg/kg, though exact targets can vary). With the lower daily dosing, patients tend to experience fewer mucocutaneous side effects and other dose-related toxicities, improving tolerability and adherence. If the cumulative dose isn’t reached, relapse rates can climb, so the strategy is to balance a tolerable daily amount with an adequate treatment duration to hit the total dose associated with durable remission.