metoprolol succinate (Toprol XL). 25 mg PO qDay initially; increased every 2 weeks PRN; target dosage, 200 mg/day.Prophylaxis. Metoprolol tartrate: 50-100 mg PO q12hr.1-17 years: 1-2 mg/kg/day PO divided BID; not to exceed 6 mg/kg/day or ≤200 mg/day. canadianpillsbuy.com buy real cialis