The generic name for Betalucel is Metoprolol Tartrate Tablets, which is taken orally as 25-50mg once, 2-3 times daily, or 100mg once, 2 times daily in the treatment of hyperthyroidism, as directed by your doctor. Metoprolol tartrate tablets are a beta-blocker that decreases placental perfusion and causes fetal bradycardia, growth retardation, intrauterine death, miscarriage and preterm labor; therefore, metoprolol tartrate tablets should not be used in pregnant women or while breastfeeding, except when necessary. Patients who are pregnant or breastfeeding, who may become pregnant, or who are preparing for pregnancy should consult a physician before using this product. Common adverse reactions to metoprolol tartrate tablets include dizziness, fatigue, coldness in the extremities, nausea, and vomiting. The drug should not be used in patients with conditions such as cardiogenic shock, II and III degree AV block, symptomatic bradycardia or hypotension. Metoprolol tartrate tablets should be avoided in combination with barbiturates, verapamil, propafenone and other drugs. Metoprolol Tartrate Tablets should be used strictly under the supervision of a doctor, and should not be discontinued or the dosage increased or decreased without authorization.