Generic name of Viagra is Sildenafil Citrate Tablets and it is useful for men to take this medication for erectile dysfunction. Sildenafil citrate tablets are clinically used to treat erectile dysfunction. Sildenafil citrate enhances the nitric oxide (NO)-cGMP pathway through selective inhibition of PDE5, elevates cGMP levels and leads to relaxation of penile cavernous smooth muscle, resulting in a natural erectile response to sexual stimulation in patients with erectile dysfunction. Some patients may experience adverse reactions such as fatigue, tachycardia, and sweating after using the drug. The drug is forbidden to be used in combination with nitrate drugs, it is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state is not suitable for sexual intercourse. It is recommended that those who need it use Sildenafil Citrate tablets under the guidance of a doctor, and not to use the drug on their own.