There is no drug that has no side effects. However, side effects are very individual, meaning that the reaction of a similar drug, may give different effects in different patients. Examples of side effects that occurred in patients A, not necessarily occur in patients B.
Drug side effects are adverse drug response and not expected to occur due to the use of drugs with dose or a normal dose.
Drug side effects are minor and there are some that are heavy, such as itching, skin rashes, nausea, vomiting, irritation of the gastrointestinal tract to steven jhonson syndrome. Because every drug has side effects, the doctor will usually prescribe medication to counteract the side effects. For example, if the side effects are gastrointestinal irritation such as cause peptic ulcers, the doctor will prescribe neutralizer, such as drug class antacids. But not all drugs have side effects, neutralizing also given a recipe, then as a patient, we must be careful. For example, if at the beginning of drug use arises itching, skin rash, facial so "swollen", the patient should immediately stop using the drug and consult your doctor immediately.