People blush, embarrassed, and snicker at the mention of Viagra. We all know what Viagra is used for and the body parts it affects. But some people will really blush like Guan Gong after taking Viagra, but not because of shyness, so what is going on? The first thing you need to understand is that there are three common Viagra drugs on the Chinese market: Viagra, Aleida, and Cialis. The chemical composition of these drugs is type 5 phosphodiesterase (PDE5) inhibitors, after taking the drug, under the effect of sexual stimulation, the drug can promote blood flow into the penis body, enhance erectile hardness, the treatment of erectile dysfunction that is ED. Secondly, any drug is inevitably some adverse reactions, ED treatment drugs are the same, Viagra can sometimes cause mild dilatation of peripheral blood vessels, manifested as facial flushing, dizziness, headache, nasal congestion, indigestion, etc., nasal congestion, indigestion, etc. Sensitive people are more likely to occur, but most are one-time, brief and mild, will not affect sexual life, much less cardiovascular function. After a period of consistent use, these adverse reactions will disappear or lessen on their own. In order to reduce the impact of these side effects and achieve the best drug efficacy, it is recommended that you take Viagra at any time within 0.5-4 hours before sexual activity, but depending on the metabolism of the drug in the body, it is recommended to take it 30 minutes to 1 hour before sexual activity for the best effect; older patients, due to the slow absorption of the drug, need to take it 1 hour or longer in advance The time to take. It is important to remind that due to the mechanism of action of Viagra, if you are suffering from heart disease, stroke, retinitis pigmentosa, kidney disease, liver disease, blood disease, penile deformity, etc., you must consult a specialist before taking it. People who are taking nitrate drugs such as nitroglycerin and cardiac pain should not take Viagra at will. Finally, people with poor physical strength and poor heart capacity should not use it. With these instructions, the affected person taking Viagra should be able to use it without blushing, but it is best to use it under the guidance of a doctor so that sex can last longer and erections can be harder to achieve what you want.