Is it okay to take Accutane every two days?

Thank you for your question.  Accutane is typically dosed based on a cumulative threshold dose of 120-150mg/kg.  Based on my calculations at 54kg you would need in the range of 6480mg to 8100mg for Accutane to be effective.  At your current dosing you should have surpassed that dosing (40mg/day x 30 days x 6months = 7200mg) plus the additional 80g x 5 days = 400mg, yields your cumulative dose at 7600mg which is well within the range of your threshold dose range.  Typically Accutane is dosed over 5 months (20 weeks) as the studies support the 120-150mg/kg dosed over 20 weeks as the most classically effective dosing regiment, however there are alternative regiments including low dose over longer periods of time.  From the information you have provided it does not appear you need to continue taking more accutane every two days as you have already reached your threshold dose.  Hope that helps.  Regards, Dr. Matt Elias