Retin-a (tretinoin) is a drug specially designed to treat skin acne and some other conditions as prescribed by your health care provider. It may take you some time to notice the first results of your treatment, but you need to keep using this remedy anyway. Stopping the treatment will prevent you from having any progress at all. If you experience any problems with skin (for example, it's too dry) ask your health care provider for advice, as there are a number of remedies you could use for that - for example, petroleum jelly. Make sure you keep your doctor updated on any symptoms you develop when taking Retin-a. Do not apply a double layer to the skin as this is not going to make Retin-a more efficient. If you or someone else accidentally swallowed any amount of Retin-a consult a doctor for professional help and consultation.