When it comes to taking medicine, the preposition that's often used is "on?"

Native speaker’s answer
Rebecca
Yes, the expression is to "be on medication." Thus, when you are describing or referring to a specific medication/medication name, you can also use the expression to "be on X." Another similar expression is to "take [medicine name]." Ex: I take Tylenol for my headaches. Ex: I am on inhibitors for my high blood pressure.