I've been on Accutane for 5 1/2 months and my acne is not cleared, should I stay on longer or discontinue?

Thank you for your question.  Generally speaking, when prescribing Accutane, most dermatologists recommend reaching a particular cumulative dose based on a patient's weight to ensure the best changes of a durable response to treatment.  That said, if your skin is not clear at the end of your course of treatment, it is unlikely that it will continue to clear after coming off Accutane without additional treatments (like oral antibiotics, topical acne medications, chemical peels, etc).  I would recommend discussing your concerns with your board-certified dermatologist at your next visit.  I hope this helps!