Cayenne pepper (Capsaicin frutescens) has been popularly used for many centuries particularly by the Aztecs of South America. This spice or herb is said to be a 'cardio tonic' as well as an analgesic (that is, pain reliever). If you check the labels of pain-relieving ointments on the shelves of pharmacies, you will notice the word 'capsaicin' as an ingredient.
Cayenne is taken orally as a powder sprinkled on food or as a spice ingredient added to fruit or vegetable juices for flavour and zest. Cayenne must not be taken with common medications such as anafranil, imipramine tofranil and warfarin. This would increase the side effects of the drugs.