Common side effects of metoprolol tartrate include causing fatigue, dizziness, headache, bradycardia, palpitations (rapid heartbeat, often accompanied by panic), abdominal pain, and diarrhea. Metoprolol tartrate lowers blood pressure, slows heart rate, and reduces cardiac output. The incidence of side effects is about 10%. Common side effects include gastrointestinal reactions, such as abdominal pain, nausea, and diarrhea, and can also cause fatigue, dizziness, headache, bradycardia, and palpitations (a rapid heartbeat, often accompanied by panic). Rare side effects include chest pain, insomnia, weight gain, and bronchospasm in patients with bronchial asthma, Rare side effects include excessive sweating, alopecia, abnormal sexual function, thrombocytopenia, cardiac arrhythmia, edema, and may cause symptoms such as anxiety, hallucinations, and skin irritation, and may also cause abnormal liver function, dry eyes, and tinnitus. Occasionally, side effects such as joint pain, hepatitis, dry mouth, and conjunctivitis may occur. Metoprolol tartrate is contraindicated in patients with cardiogenic shock, sick sinus node syndrome, and second to third degree AV block.