The most common acne drugs are minoxidil, isotretinoin, and isotretinoin. Minoxidil and isotretinoin are the main ones used in acne treatment. Minoxidil is used mainly to treat acne. There is a newer drug in the market called tretinoin. In this drug, isotretinoin has been substituted. When you see the words isotretinoin in the product information on a product label, it means that it has been replaced by tretinoin. What this means is that the drug has not been removed from the original formulation, but its active ingredients have been changed. You might ask why these drugs are so expensive. I have heard that some people think that these drugs are too expensive, but I think that it is true. As the cost of a new drug has increased, this drug has become less effective. The original formula will never last as long as the new formulation. But this is true also for the old, old acne medication that we all took a while ago, which is also being replaced by the newer, newer formulation. The problem is that it's very difficult to know which side effects you're getting from each drug, because the side effects are very specific. You might have a skin problem for a few days or even weeks, and then there is no skin problems for a long time after that. This is because the new formula can't do the job.