Drug therapy (or pharmacotherapy) is simply the use of various medications to treat disease. This form of treatment may require close monitoring and testing of patients to understand how a specific drug will be tolerated by individuals and how it may interact with other medications. As one example, because the absorption of certain drugs is affected by conditions associated with kidney disease, dosage management in patients with kidney problems can be very complex and require continual lab testing to ensure best results. Some physicians may conduct clinical trials of promising drug therapies with the goal of continuously advancing the realm of successful treatment options. When an adverse effect or interaction is associated with a prescribed medication, your doctor will most likely change your dosage or create a new plan of care with an alternative prescription.