Viagra is the trade name and generic name of sildenafil citrate tablets, which can be taken once in a while by young people in the presence of erectile dysfunction, but is not recommended if there is no erectile dysfunction.
Sildenafil citrate tablets can be used to treat erectile dysfunction through selective inhibition of PDE5, enhancement of nitric oxide (NO)-cGMP pathway, elevation of cGMP level and leading to relaxation of penile cavernous smooth muscle, so that patients with erectile dysfunction can have natural erectile response to sexual stimulation. Young people with indications can take it as needed 1 hour before sexual activity.
The use of sildenafil citrate tablets may cause adverse reactions such as indigestion, rash, headache, flushing, visual abnormalities, nasal congestion, back pain, myalgia, dizziness, and nausea. Therefore, it is not recommended for young men without indications.
The drug is contraindicated in people taking nitrates, known hypersensitivity to the product, it is not suitable for women, children. The drug is prescribed and should be used wisely under the supervision of a doctor.