If you take any medications, you must mention this to your hair transplant surgeon or to the clinic before your hair transplant. If you take particularly blood thinning medications and such, you must not take them before your hair transplant. One must not take any E vitamins before the surgery. If the medications that you take contain garlic and its derivatives, it is best to stop taking them prior to your hair transplant. My most important advice for hair transplant patients is: they should mention all the medications that they are currently taking (and used to take) to their hair transplant surgeon or the clinic.