Viagra generally refers to sildenafil citrate tablets, which can be used by seventy year old men with erectile dysfunction, subject to medical advice. Sildenafil citrate is mainly used to promote penile erection and is a treatment for erectile dysfunction. The drug is not suitable for women and children, and is contraindicated in the use of guanylate cyclase agonists, the use of any form of nitric oxide donor, as well as allergic to the product. Since the drug is not contraindicated in elderly men, the drug can be used in elderly men aged 70 years for whom it is indicated, but elderly patients are at increased risk of cardiovascular disease, which should be taken into account during the administration of the drug. In addition, adverse drug reactions include abnormal vision, hot flashes, nasal congestion, headache, back pain, myalgia, dizziness, rash, dyspepsia, and nausea. Specific drug use matters should be carried out under the guidance of a specialist, and should not be used without authorization.