Viagra is the trade name and generic name for sildenafil citrate tablets, and the effects generally last between 0.5 and 4 hours.
Sildenafil citrate tablets are indicated for patients with erectile dysfunction, as the drug is able to increase the level of cyclic guanosine monophosphate, so it improves the relaxation of smooth muscle in the corpus cavernosum and promotes the entry of blood into the penis. Usually the duration of the drug is between 0.5 and 4 hours, but there is no fixed duration because each person has a different body type and drug absorption level.
The application of this drug is contraindicated for special groups of people who are allergic to the components of sildenafil citrate tablets, resting state hypotension or hypertension, pigmentary retinitis. During the application of sildenafil citrate tablets, it is contraindicated to take them at the same time with nitrate drugs, in order to prevent affecting the effectiveness of the drug or inducing discomfort in the body.
The common adverse reactions of Sildenafil Citrate Tablets mainly include headache, flushing, dizziness, nasal congestion, indigestion, visual abnormalities and so on.
It is recommended to take Sildenafil Citrate Tablets under the guidance of a doctor, and it is forbidden to use the drug indiscriminately or increase or decrease the dosage at will. If you experience any discomfort after taking the medicine, you should stop taking the medicine and consult a doctor in time to prevent any accidents from happening.