How often to take sildenafil is not a clear rule, with the patient’s personal situation, from 2 times a week to once a month or even longer once, but is not recommended to take frequently. Sildenafil is a drug for the treatment of erectile dysfunction, the drug is symptomatic treatment drugs, taken before sex, is not recommended for frequent use, so as not to cause adverse reactions. For young patients with more frequent sexual life, it can be used 1 or 2 times a week; for some patients with less frequent sexual life, it can be taken once every 2 weeks or once a month or even longer. If taken frequently, it may cause adverse reactions such as lower blood pressure, nasal congestion, abnormal erection, headache, nausea, dizziness, blurred eyes and vision, back pain, muscle pain, and rash. The drug is prohibited in combination with nitrates, it is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state is not suitable for sexual intercourse. Patients should consult a doctor before using the drug and take it under his guidance.