Viagra is the trade name and generic name for sildenafil citrate tablets, and sildenafil citrate tablets are usually ineffective for women. The drug’s instructions clearly state that it is not for use in women. Sildenafil citrate tablets are generally a common medication used to treat erectile dysfunction in men. It has the effect of dilating blood vessels, which can make the cavernous body of the penis congested with blood, promote the erection of the penis, and increase the hardness of erection. Sildenafil Citrate Tablet is a prescription drug and patients with hypertensive heart disease are at risk of postural hypotension and sudden death when using it. Some of the common adverse reactions are such as headache, facial flushing and indigestion. The drug needs to be used under the guidance of a doctor, do not use the drug blindly on your own to avoid adverse consequences.