Viagra is the trade name, generic name is sildenafil citrate, subject to drug specifications, and geographical and other factors, the price of a large differences, usually a box of price fluctuations between 70 to 770 yuan RMB. The specifications of Sildenafil Citrate are 50mg*1s, 25mg*28s, 50mg*5s, 0.1g*1s, 0.1g*10s and so on, while the consumption level of different regions varies, and the price of the drug has some influence. The general price of Sildenafil Citrate is as follows, 50mg*1s costs around RMB 70, 25mg*28s costs around RMB 700, 50mg*5s costs around RMB 280, 0.1g*1s costs around RMB 110 and 0.1g*10s costs around RMB 780. Sildenafil citrate is a drug for treating erectile dysfunction in men. Although it has better therapeutic effect, it may cause headache, flushing, dizziness, nasal congestion, dyspepsia, visual abnormality and other adverse reactions, and it should be used reasonably under the guidance of a doctor to avoid overdose. In addition, it should be noted that when using, sildenafil is forbidden to combine with nitrate drugs, women, people who are allergic to this product, children, and people who should not have sex in recent cardiovascular status are forbidden to use this drug.