Viagra, which is the transliteration of the trade name Viagra for Sildenafil Citrate tablets (commonly known as Viagra), has been officially approved for marketing by the FDA (U.S. Food and Drug Administration) since March 1998 and was launched in China in July 2000. As a first-line drug for the treatment of ED (erectile dysfunction), some people have always thought that Viagra is a so-called “aphrodisiac” that stimulates sexual desire, as if it were a “dominatrix”. Therefore, some men do not have erection problems, but lack of Viagra as an aphrodisiac to take freely, which may cause certain physical effects. How much do you know about the dangers of overdosing on Viagra? 1. erectile dysfunction men with urethritis, leukemia, if you take an overdose of Viagra, there may be a long time erectile dysfunction, the result will be damage to the cavernous tissue of the penis, and even aggravate erectile dysfunction and make the prostate continuously congested induced prostatitis. If an erection lasts more than 4 hours you must seek medical attention immediately. 2. Dizziness In previous clinical observations, it was found that 1 in 10 patients suffered from severe headaches, and the higher the dose, the more severe the headache. 3. Blurred vision About 3% of the patients taking the drug may experience temporary blurred vision, and some may also experience blue vision (blue vision), if this happens, it is recommended to stop using. 4. Dizziness If you take nitroglycerin and other drugs at the same time, patients can immediately produce dizziness or even fainting symptoms. This is due to the hypotensive effect of Viagra itself, combined with the mixing of drugs such as nitroglycerin, blood pressure will be greatly reduced, which may be life-threatening. 5. cardiovascular disease ED may be an early sign of cardiovascular disease, diabetes, casual use of the drug without medical attention, may cover up the real condition. Glaucoma Taking Viagra can lead to a drop in blood pressure, but glaucoma patients have higher blood pressure, so that 3-5% of people may have acute glaucoma, and acute glaucoma can make people blind overnight, even if the cure can not restore the original vision. Therefore, for ED patients, Viagra is still a very good first choice of treatment drugs, under the guidance of physicians and with the treatment, can play the maximum effectiveness of the. The last mention, ED patients should not be afraid to take Viagra as an “aphrodisiac”, taking Viagra is not dependent, not addictive.