If I were in your shoes, I’d definitely NOT stop taking isotretinoin until I’ve finished the course. Many studies have shown that the risk of acne relapse is much higher if you don’t complete the course.
The total dosage you need to take depends on your BODY WEIGHT as well.
Tapering your dosage wise, please speak to your doctor. Again, if I were you, I’d just stick to the dosage that he has placed you on, since it appears that you are not suffering any adverse effects (apart from dry lips, which is very common).
Perhaps there are other reasons which you didn’t mention for which you’d like to lower the dose. In which case, yes, there are indeed regimes where by you take a lower dose less frequently, over a longer period of time. Again, it should be your doctor advising you on what the most appropriate regime is.
