It’s really important to keep track of medication that you take whether its prescribed or not. Use your phone to take a picture of any medication you are on. If you have the prescription, put that in the photo too. If not, write a note saying how often you take the medication and put it in the picture too.
If you know how to save the photo to an album in your phone, create an album called “My Prescriptions” and save the photos of your prescription to that. Otherwise, just take regular pictures of your prescriptions – your doctor should be able to find them.