Dr Rynne, a female patient had a history of hypertension, was on perindopril 10mg daily for control her blood pressure. Mrs Lee presents with a headache, palpitation, on exam: her blood pressure s 169/95mmgh, heart rate 139bpm, temperature 36.9, respiration rate is 24bpm. 12 leads ECG showed atrial fibrillation. Metoprolol has been prescribed as first line treatment for Mrs Lee’s condition. What is right dose for this scenario, how long she can take this medication for? Thank you for the answer.