Nifedipine tablets and captopril tablets both belong to the blood pressure lowering drugs, but the mechanism of action is different, the two can be used together. 1. Nifedipine: Nifedipine is a kind of calcium antagonist and an anti-hypertensive drug. Its main mechanism of action is to act on the vascular smooth muscle, dilate blood vessels, so as to achieve the purpose of lowering blood pressure. Some patients may have headache, upper and lower extremity redness and swelling, nausea and other adverse reactions after taking it. It is forbidden for those who are allergic to nifedipine and other ingredients in this product, and forbidden for pregnant women. 2. Captopril: Captopril is an angiotensin-converting enzyme inhibitor, belonging to the anti-hypertensive drugs. Its main mechanism of action is to inhibit the conversion of angiotensinogen to angiotensin I, so as to achieve the purpose of lowering blood pressure. Some patients may experience adverse reactions such as rash, palpitations, tachycardia, etc. Captopril is contraindicated for those who are allergic to this product or other angiotensin-converting enzyme inhibitors. Although the mechanism of action of captopril and nifedipine are different, they can be used in combination with each other and complement each other, but should have to be used in combination under the guidance of a doctor’s advice.