Viagra, also known as sildenafil citrate tablets, is a common medication used to treat erectile dysfunction in men, and the retail price at the pharmacy is usually around $50. Although it is available in pharmacies, this medication is a prescription drug and requires a prescription to purchase.
Sildenafil citrate tablets, belonging to the type 5 phosphodiesterase inhibitors, through selective inhibition of PDE5, enhance the nitric oxide (NO)-cGMP pathway, elevate the cGMP level and lead to penile cavernous smooth muscle relaxation, so that patients with erectile dysfunction to sexual stimulation to produce a natural erectile response.
The drug has some side effects, and some people may experience nausea, vomiting, dizziness, headache and other uncomfortable symptoms after use. In addition, it should not be used by people who are taking nitrate antihypertensive drugs. The drug is contraindicated in women, people who are allergic to the product, children, people whose recent cardiovascular state does not allow them to have sex.
Overall, sildenafil citrate tablets belong to prescription drugs, although the drugstore is sold, but because the drug has a strict use of the population as well as certain side effects, you need to be prescribed by a professional doctor, with a prescription to buy and use, can not be used blindly to avoid adverse consequences.