How long the side effects of antihypertensive drugs will appear varies from person to person often and the dosage used as well as the individual’s sensitivity to the drug, some may appear after taking the medication, some patients will appear after taking the medication for a few minutes, while some may take the medication for a few days or a few weeks before the side effects will appear. There are many types of antihypertensive drugs, and each type of antihypertensive drugs, after taking the drug, there may be some side effects, some patients after taking the drug minus ten minutes will appear headache, blushing, palpitations, nausea, vomiting and other symptoms, but some patients short-term side effects are not obvious, after a few days or a few weeks of taking the drug will appear obvious side effects. Antihypertensive drugs must be guided by a doctor, the medication should not be taken at random, after the use of medication, pay attention to the observation of adverse reactions, if the adverse reactions are obvious need to stop the drug and consult a doctor in a timely manner.