Drug side effects are unwanted, usually unpleasant, effects caused by medicines. They can be mild, such as a stomachache or dry mouth, or more serious, such as liver damage or heart problems. Side effects can vary from person to person, depending on the drug, the person's age, weight, and other health conditions.
It is important to talk to your doctor about any side effects you experience when taking medication. They can help you determine if the side effects are serious and if there are any ways to manage them.