"she uses" is an odd phrase for a patient. Patients normally "receive" or "are given". Drug addicts and doctors "use" a drug.

Mmh, not sure. I received a prescription for a drug from my doctor, now I use (or 'take') that drug/medicine once a day.

It's common for those wordings to be used because often it literally is a handing over of drugs you're talking about - with sickness you're more likely to talk about the moment a medical person said to start using a drug than to tell people about the actual use because it's usually more interesting.