I need help...am i wrong for doing this?

My name is sarah and im studying to get into law school. Im smart and have the grades to get into law school but i get really tired and have trouble focusing and staying awake for tests. I want to take Provigil, its a preformance enhancing drug that can help me stay awake and focus for my LSAT's. My mom takes Provigil and shes a lawyer, she takes them when shes working on tough cases. My doctor has proscribed me the drug and says i can take it. Am i wrong for taking this drug? its a preformance enhancer. What different philosophical views would argue that what im doing is wrong?