For many viral infections there are no effective antiviral medicines (unlike antibiotics for bacteria). Fortunately, the immune system in the body usually fights off most viral infections within a few days. Taking 'symptomatic' treatments for a high temperature (fever) or catarrh, such as paracetamol and/or ibuprofen, resting and drinking plenty are usually all that needs to be done to get better.
Not trying to steal points, but no one can really answer this question without knowing which drug you are asking about! I’ll try to help if you comment what drug the question is about :)
