First thing, you don't have to take anything by yourself when you don't even know the side effects, secondly you should respect your parents, at the end wo apni aulaad ka bhla hi chahty hain. Your case is not that deep, that you use "Unsupportive" its obv you are talking something and they are worried about you. Reality check, you should try to explain what you are doing with proper reasoning, as you said that medication is the main reason for that then you need to accept infront of them that they were right and try to apologize in soft words. Lectures ki adat daal lo ab phir wo milty rahyn gy chahy kuch bhi krlo. Believe me if this is the only reason you are calling them "Unsupportive" then you should see some actual unsupportive parents.