The term "right drug" is not a commonly used phrase, but it could refer to a medication that is appropriate for treating a specific condition or symptom. Full definition
If doctors can more accurately predict what drugs will treat someone's cancer, they can select the right drugs for the right patients. (cnbc.com)
It is hoped the new procedure will improve doctor's understanding of individual patient's reactions to cancer treatments, ensuring they get the right drugs and care. (politics.co.uk)
We will continue to apply the right drug until the symptom vanishes. (dailypost.ng)