Methyldopa is recommended to go to a hospital and buy it under the guidance of a doctor. The indications for this drug are mainly hypertension, for hypertensive patients can be applied, in general the specifications of 0.25 grams, taking norms are generally oral, each time 250 mg divided into 2 to 3 times a day, every 2 days to adjust the dose 1 time, always to achieve the overdue effect. In general, the dose is increased at night to reduce the excessive sedative effect of the drug, because this drug has the potential to cause fatigue and weakness, its maintenance dose is 0.5 to 2 grams per day, divided into 2 to 3 oral doses, the maximum dose should not exceed 3 grams per day. It should be noted that this drug has more side effects and is recommended to be applied under the guidance of a physician and used with caution in patients with coronary artery disease and other conditions.