Nifedipine may affect the electrocardiogram if your heart beats faster after taking it. Nifedipine is a calcium channel blocking drug that relaxes the smooth muscle of blood vessels, thereby lowering blood pressure. Although the effect on the sinus node and atrioventricular node is relatively weak, it can reflexively accelerate the heart rate, so it may make the heart rate faster after taking it. At this time, the electrocardiogram will appear to accelerate the heart rate, and in serious cases, it will lead to sinus tachycardia, which is not conducive to the correct diagnosis of the doctor. Nifedipine may increase the heart rate after taking it, so it is recommended to wait for a certain period of time after taking nifedipine before taking an ECG. This can improve the accuracy of the test and avoid the influence of drug factors on the test results.