Viagra generally refers to sildenafil citrate, which is mainly used to treat erectile dysfunction.
Sildenafil citrate enhances the nitric oxide (NO)-cGMP pathway by selectively inhibiting PDE5, elevating cGMP levels and causing relaxation of penile cavernous smooth muscle, resulting in a natural erectile response to sexual stimulation in patients with erectile dysfunction. Indications are male erectile dysfunction.
Common adverse reactions to sildenafil citrate include dyspepsia, nausea, vomiting, headache, dizziness, rash, and abnormal vision.
This drug is contraindicated for patients with any of the components in sildenafil citrate; sildenafil drugs should be contraindicated during the application of guanylate cyclase agonists and nitrates. This drug is also contraindicated in women, children, people whose recent cardiovascular state does not allow them to have sex.
For male patients who need to apply this drug, it is necessary to follow the instructions of the doctor. After taking the drug, if there is a serious adverse reaction, we must pay attention to it and seek medical treatment as soon as possible.