What can i do if i had an allergic to medicine? trying something else but i'm unsure if i'll be allergic to it again?

? Drug allergy: If in doubt, take the first dose of any new drug you believe you might be allergic to, in any hospital ER waiting area, wait for an hour after administering the dose, if nothing happens move on, bad allergic reactions occur within that window period of the first dose, if it happens, you are in very place you want to be, otherwise you are fine, good luck