Oral antihypertensive drugs commonly contain nifedipine tablets and captopril tablets, but the specific treatment program should be based on the cause of the disease and the individual’s physical condition to choose, there is no so-called “fast”, the effectiveness of the drug is different from person to person. 1. Nifedipine tablets: they are calcium channel blockers and can be used in patients with high blood pressure. Generally, it takes 30~60 minutes to take effect orally, and 1~5 minutes to take effect sublingually. It should be noted that it is forbidden for those who are allergic to nifedipine; at the initial stage of treatment, headache, flushing, fever and other adverse reactions may occur. 2. Captopril Tablets: It is a vasodilator and can be used for patients with hypertension. Generally 1~2 hours of oral intake can achieve the maximum antihypertensive effect. It should be noted that it is forbidden for those who are allergic to this product or other angiotensin-converting enzyme inhibitors; the more common adverse reactions include palpitations, tachycardia, chest pain, cough, and dullness of taste. In summary, both drugs are relatively fast-acting, but it is recommended that they be used under medical supervision.