Viagra is the common name of sildenafil citrate tablets, this drug can not be used at the same time with nifedipine extended-release tablets, the medication needs to be spaced out for a period of time, the specific use of medication must be carried out in accordance with medical advice. Sildenafil citrate tablets are suitable for the treatment of erectile dysfunction in men over 18 years of age, but the drug is contraindicated in people who are allergic to it or who are using nitrate drugs such as isosorbide mononitrate, etc.; nifedipine extended-release tablets are suitable for the treatment of chronic stable angina pectoris, angina pectoris variant, or essential hypertension, but it is contraindicated in people who are allergic to it, pregnant women, or people who have a history of cardiogenic shock, severe aortic stenosis, and other conditions. Current drug studies do not suggest that sildenafil citrate tablets and nifedipine extended-release tablets will interfere with each other’s therapeutic effects when used together, so when the user meets the indications for both and excludes the above contraindications to the use of the drug, it is possible to use these two drugs. However, it should be noted that simultaneous use does not mean simultaneous consumption, sildenafil citrate tablets and nifedipine extended-release tablets if taken together may enhance the antihypertensive effect, resulting in the occurrence of low blood pressure, so it is recommended that the two drugs are taken separately on the same day, the interval between the time of taking the drug more than 4~5 hours. It should also be noted that there is a possibility of adverse reactions such as headache and nausea during the administration of Sildenafil Citrate Tablets, while the adverse reactions of Nifedipine Extended-Release Tablets include redness and swelling of the skin, and palpitations (rapid heartbeat, often accompanied by panic). Those who have the need to combine Sildenafil Citrate and Nifedipine Extended-Release Tablets must strictly regulate the use of medication under the guidance of a doctor, and must not blindly take medication or increase or decrease the dosage of medication on their own, so as not to cause adverse consequences.