1. Because the retinoin is so expensive and may be more of a problem than the other drugs, there's one option that will save you an inordinate amount of time and money. Many people end up taking their retinoin therapies while staying in their own room since your own room is more comfortable and it's a good idea to be with your therapist. It makes sense to have more time up-front as well as to go with the advice of your doctor.