Warfarin interacts with many prescriptions and over-the-counter (OTC) medicines. OTC medicines can be found in the aisles at a pharmacy. This includes vitamins, herbal and natural products. Bring a list of all the medicines you take to your appointments so they can be checked for drug interactions.
It is very important for you to check with your provider before starting, changing, or stopping any medicine. You may need more frequent INRs or changes in your warfarin dose if you have changes in medicines.
The following is a list of some OTC medicines you should not take, unless told by your doctor. These lists do not have everything that may interact with warfarin. It is very important to check with your pharmacist if there are any changes to your medicine while on warfarin.