Many people take prescription medications. It's normal to be on a prescription medication after a surgery, when suffering from infections and when sick. Doctors weigh the benefits of antibiotics, pain medications, anxiety or depression drugs, and others to make sure that they're the best choice for the patient at that time.
When a doctor sees a patient with an injury, for example, they may determine that treating the patient with opiate medications as well as muscle relaxants is necessary. However, if the patient takes these medications over a long period of time, there is a risk that they could become dependent on them. A physical or mental dependency is hard to break, because patients think they need a medication and the body reacts poorly when it doesn't get it.