After taking nifedipine, breastfeeding should be allowed at least 8 hours after the drug is discontinued. Nifedipine is one of the calcium antagonists, which has the effect of dilating coronary arteries and peripheral arteries, can inhibit vasospasm, and is the drug of choice for variant angina pectoris. In clinical practice, it is mainly used for the prevention and treatment of coronary heart disease and angina pectoris, especially angina pectoris caused by variant angina pectoris and coronary artery spasm, and is suitable for all types of hypertension, and also has better efficacy for intractable severe hypertension. It can cause a decrease in blood pressure after application, because the blood concentration is still above the effective concentration 6 hours after application, so it can be transmitted to the breastfed child through breast milk, resulting in adverse reactions such as hypotension in the breastfed child. Nifedipine can appear in the plasma after 2-3 minutes of administration, and the plasma concentration of the drug reaches its peak within 1 hour of administration, and its half-life is 4-5 hours. 6 hours later, the plasma concentration still exceeds the effective concentration, so there should be at least an 8-hour interval before breastfeeding after taking nifedipine.