”Viagra, chemically known as sildenafil citrate, is a common drug used to treat erectile dysfunction (commonly known as impotence, abbreviated as ED). However, many people have some misconceptions about its understanding and use, here to give a brief explanation and clarification. 1, “Viagra” is “aphrodisiac”? ”Viagra is not “aphrodisiac”, after taking it can not directly trigger or improve sexual desire, only under the sexual stimulation effect (sexual stimulation are audio-visual stimulation, kissing, touching, etc.), so that the male erection more firm, more durable, to achieve satisfaction and sexual life. 2, taking “Viagra” can be addictive? Taking Viagra is not addictive. Drug addiction is a chronic, relapsing, compulsive behavior in which the patient continues to take the drug regardless of the consequences. Addictive drugs can induce euphoria or relieve pain, leading to tolerance, dependence, addiction and relapse, making people “addicted”, such as opium, marijuana, amphetamines and nicotine. The Viagra does not have the above side effects, so there is no need to worry about tolerance, not to mention addiction like drug addiction. 3, long-term use of “Viagra” will be resistant to drugs? In the treatment of erectile dysfunction, some patients need long-term medication. So, with the prolongation of the medication, will drug resistance occur? Will the drug gradually become ineffective? From some studies and reports at home and abroad, it has not been found to have drug resistance, and many patients can still maintain good results when taking it for a long time. 4.Can Viagra treat both the symptoms and the root cause of the disease? ”The mechanism of action of Viagra is mainly through the expansion of local blood vessels in the penis to improve the erectile hardness of the penis. For some mild patients or patients with mainly psychogenic symptoms, taking Viagra together with behavioral therapy can achieve a cure, which is often referred to as “treating both the symptoms and the root of the problem”, while other patients cannot get rid of the root of the problem and may need long-term medication. For some patients with other underlying diseases, such as diabetes, hypertension, etc., active treatment and control of the primary disease is required.