Let's take a minute to talk about your medication. This is irbesartan, and you should take it as directed by your doctor, at the same time each day. Irbesartan treats high blood pressure. Controlling high blood pressure can help protect you from heart attacks, stroke, kidney failure and loss of eyesight. This medicine is usually well-tolerated, but side effects can occur, like mild back pain, diarrhea, sore throat or sinus problems. It can also make you lightheaded, so stand slowly after you've been sitting or lying down. These effects are normal if they are mild, and they should go away. If these or other side effects become reasons you want to stop taking it, please talk to your doctor or pharmacist. As with any medicine, you should call your doctor if you notice unusual changes to your body. For example, get immediate help if you have problems breathing, or swelling, especially in your face or throat, because it could be a rare but serious allergic reaction. You should talk to your doctor or pharmacist before taking any non-prescription pain medicine or before using a salt-substitute. Also, it's important to stay hydrated, so drink adequate fluids, avoid prolonged sweating, and, call your doctor if you have prolonged vomiting or diarrhea. Women should avoid becoming pregnant because this medicine can be unsafe for the baby. Call your doctor right away if you do. For best results, continue taking irbesartan, and follow your doctor's advice about diet, exercise and checking your own blood pressure.