Hi, Bilocor contains bisoprolol fumarate which belongs to the group of medications known as beta-blockers is used to reduce the force and speed of your heartbeat while also lowering your blood pressure. It works by preventing the the hormone adrenaline or epinephrine from binding to beta receptors. It is also used to treat chest pain or angina, congestive heart failure, irregular heartbeat or arrhythmia, migraine, anxiety, glaucoma and prevent heart attacks or strokes by lowering blood pressure. Bilocor slows down your heart rate. This can trigger symptoms associated with low blood pressure or hypotension such as dizziness, fatigue etc. Its other side effects are cold extremities, nausea, vomiting, upset stomach, diarrhea or constipation, depression, insomnia, nightmares, hyperglycemia, breathing difficulties, allergic reactions etc. It is dangerous to stop taking Bilocor suddenly even if you are experiencing side effects. If you stop taking them suddenly, you could increase your risk of a serious heart problem like a heart attack. Contact your doctor if you experience unpleasant side effects with beta blockers that last for more than a day or two. Your doctor might suggest another type of medication, but you will still need to slowly tapper your Bilocor dose. Take care. Hope I have answered your question. Let me know if I can assist you further. Regards, Dr. Zubayer Alam, General And Family Physician