The generic name of Viagra is Sildenafil Citrate, how many times a month to take this kind of medication is should consult a professional doctor, there is no uniform standard of taking. Sildenafil citrate has the effect of increasing the hardness of male penile erection and prolonging male sexual life. It should be taken according to the principle of taking the drug on demand and on time. Taking the drug on demand means taking the drug half an hour to one hour before sex. This method of consumption is generally applicable to patients with mild erectile dysfunction and psychological erectile dysfunction. For patients with psychological erectile dysfunction, the medication can be stopped after one to several doses. Sometimes it is also used for some patients with severe erectile dysfunction, and those who do not respond well to conventional treatment may take a full dose before each sexual intercourse to help with erection. Symptoms such as facial edema, shock, weakness, pain, chills, chest pain, migraine, angina, fainting, and tachycardia may occur after taking the medication, with gradual return of symptoms after about 24 hours. If there is a sudden loss of vision, or hearing loss, the drug should be stopped immediately and medical attention should be sought as soon as possible. Sildenafil enhances the antihypertensive effect of nitrate, so it is contraindicated in patients taking any dosage form of nitrate and in patients who are allergic to this drug, either regularly or intermittently. The drug is recommended for use as prescribed by a physician.