All meds contain "inactive ingredients" which may include starches & sugars, preservatives, colors, etc. What you are really asking is if those inactive ingredients are present in significant quantities to affect your fast, which is not something anyone can really tell you objectively. If you are trying to be keto and want to know if the pills break your ketosis you can buy keto strips and check yourself. If that helps. But that's kind of intense. If you just want to not eat food (= fasting) then pills are not food and you are good.