What can alter the way that the body reacts to medications?

Answer 1

Various things can affect the way the body reacts to medications. Diet, for starters. Over the counter medications can have an adverse interaction with prescription medications. Other medications often have interactions that one would find undesirable. Check with your pharmacist (not your doctor) about drug interactions. Don't rely on the internet for this information, as the internet is mostly made up of advertisements for penis enlargements, porn, and for the most part, edited by strange people that you wouldn't and shouldn't normally trust (such as myself).

Most definitely ask your pharmacist if you have any concerns about your medications. It's their job to address such concerns.