Viagra’s drug generic name is sildenafil, high blood pressure taking nifedipine can take sildenafil, but must be under the guidance of a doctor to use the drug, but also need to closely monitor blood pressure. Sildenafil is mainly used to treat penile erectile dysfunction, and nifedipine belongs to the calcium antagonist class of antihypertensive drugs. Sildenafil and nifedipine have no absolute contraindications for joint use, so sildenafil can be used when taking nifedipine to control blood pressure. However, the simultaneous application of sildenafil and antihypertensive drugs may lead to the occurrence of hypotension, so the two drugs mentioned above should be used together with caution, and need to be evaluated by a doctor before use. And after the use of the drug need to closely monitor the blood pressure situation, if the occurrence of hypotension and other adverse reactions, should promptly go to the hospital. Nifedipine can lead to palpitations, dizziness, headache, peripheral edema and other adverse reactions; sildenafil can lead to headache, dyspepsia, myalgia, dizziness and other adverse reactions, allergic to the above drugs belong to the contraindications to the use of medication, so the use of medication need to be guided by a doctor, strengthen monitoring. Therefore, during the period of taking nifedipine for hypertension, it is necessary to go to the hospital to assess the condition before deciding whether to use sildenafil.