Methyldopa may inhibit sympathetic nerves when taken by normal people, and may lower blood pressure and produce certain adverse reactions and toxic reactions in clinical practice. 1. Reduce blood pressure:Methyl norepinephrine produced by methyldopa is a very strong central alpha agonist, long-term use of the drug has some adverse reactions, mainly in drowsiness, fatigue, depression, dizziness and other symptoms. 2. Adverse reactions:such as vertigo, dizziness, drowsiness, headache, fatigue, poor concentration, dry mouth, nausea, vomiting, constipation, abdominal distension, black tongue or ulcers; postural hypotension, bradycardia, edema. 3. Toxic reactions:such as hypotension, syncope, myocarditis, severe bradycardia, atrioventricular block. Methyldopa, as a prescription drug, should be taken strictly under the prescription and permission of a doctor, patients should not self-medicate, and normal people should not take this kind of drug.