1, Viagra is not an aphrodisiac. It can only let you in the fire when a pillar of heaven, but if your sexual interest is flat, depressed, or quiet as water, eat more Viagra can not make you naturally erect. (Note: Viagra, which is the name of a drug translated by the clever Chinese, formerly known as Viagra, also known as Viagra (Sildenafil), produced by the United States Pfizer, was launched in 1998 and introduced to China in 2000. (Viagra can only have the effect of promoting penile erection when receiving proper sexual stimulation, it does not help to improve your libido.) 2, men secretly taking Viagra without their wives can lead to suspicion between the couple. A study by the University of Canterbury in New Zealand found that women surveyed (aged 33-68) harbored a range of concerns about their other half secretly taking Viagra, their worries included feeling unnatural during sex and whether their husbands were cheating on them. (Note: Many women attributed their husbands’ deteriorating erection quality to a loss of enthusiasm for themselves or to the fact that their husbands had fallen out of love. (Of course, some women worry that once their husbands get strong erections with the help of drugs, they may increase the chances of cheating.) 3. About 70% of men who have used Viagra have reported that the ease, hardness and durability of their erections have improved after taking Viagra. (Note: The mechanism of action of Viagra is to dilate blood vessels throughout the body, allowing blood to flow more easily to the heart, lungs and other organs. In addition, Viagra can also soothe the smooth muscles of the penis, so that the penis has more room to accommodate blood, and when the amount of blood filling the penis increases, erectile function will naturally improve significantly.) The first thing you need to do is to take a dose of Viagra, and there are usually three doses for you to choose from: 25mg, 50mg and 100mg. This small, diamond-shaped blue pill is usually taken one hour before intercourse and begins to take effect after 30 minutes, and then the effect lasts for about five hours. (Note: Currently the domestic sale of Viagra formulations are mostly 100mg per tablet, when taking it can be divided into two or four with a sharp knife.) 5, Viagra is not cheap, an average of about 100 yuan per piece. The reason for the high price is that the domestic legal products of the same kind are delayed to market. (Note: Pfizer also has a statement on its “Viagra” pricing, it is reported that the company’s research and development costs for new drugs are generally maintained at $2000 per day, only Viagra a drug, research and development investment of more than $1 billion. (Such a high investment in research and development, naturally, in the pockets of patients.) 6, most of the Viagra sold online are fake. Dr. Nick Wilson of the University of London pointed out in a research study of online sales of Viagra that more than half of the Viagra sold online are counterfeit products, some of which are different drug ingredients, and some of which have a lower content of ingredients that work than real Viagra. (Note: The current online sales are quite hot, with various versions of Viagra popping up, not the least of which is filled with a large number of counterfeit drugs, which is the result of the huge profits of the drug. (In the network sales regulations are not yet sound at the moment, try not to buy Viagra online.) 7, Viagra is not alone, in the lure of lucrative profits, but also inevitably bumped into strong competitors. 1998 when Viagra was introduced to the market, the only drug of its kind. Now it has two competitors: Elidel and Cialis. Vaidenafil, which has a faster onset of action of 16 minutes and lasts up to six hours, is said to have fewer side effects than Viagra. Tadalafil, which is usually the first choice for patients with short-lived erectile dysfunction because it lasts for up to 36 hours, far longer than the other two drugs. This means that there is no need to deliberately time intercourse for the duration of the drug, thus making sex more relaxed and natural. However, the side effects of the drug are said to be greater, as the ingredients stay in the body longer. (Note: In fact, in general, the clinical effectiveness of the three drugs is basically the same, there is no significant difference, and the side effects of these drugs are very mild, so there is no need to consider the issue of efficacy and side effects when choosing. (To combine their own situation to choose the right drug, such as young people are more energetic physical strength, you can choose a long duration of efficacy of cialis, while older frail men may wish to choose Viagra or Alida.) 8, any drug will have side effects, and Viagra is no exception. In 2005 and 2007, the FDA notified Pfizer that the instructions for Viagra should inform the user of the risk of blindness and deafness. In particular, it should be noted that Viagra is lethal when combined with nitrates, which are commonly used to treat angina (e.g., nitroglycerin). (Note: Generally speaking, Viagra is a drug with relatively mild side effects, and it is rare to discontinue its use because of intolerable side effects, but always remember that combining it with nitrates is strictly prohibited!) 9. In rare cases, Viagra can cause abnormal penile erection: persistent painful erection of the penis for more than 4 hours without self-fatigue. Abnormal erections must be treated within 6 hours of occurrence, otherwise they can damage the erectile tissue of the penis and cause irreversible and severe erectile dysfunction. (Note: This is extremely rare and occurs mostly in men who have a tendency to have abnormal penile erections themselves.) 10, Viagra has the potential to cause male infertility. According to a study by Dr. David Gran, a gynecologist and consultant at Queen’s University Belfast, Viagra has the potential to damage sperm quality, and a few men who take Viagra as a sex drug will have a decreased chance of being a father. (Note: When men take Viagra, the sperm in their bodies become more active. These little tadpole-like creatures exhaust themselves early due to overactivity, and even if they barely reach the vicinity of the egg, they are unable to enter the egg cell due to the depletion of energy. (A test with rats showed that rats taking Viagra produced 40% fewer embryos than those not taking Viagra.) 11, some people use Viagra as a fun drug when they are in the club, because it counteracts the erection-suppressing power of cocaine, ecstasy and amphetamines. But this could kill you. For example, mixing the aphrodisiac “Poppers” (the main ingredient is amyl nitrate) with Viagra can cause a dramatic drop in blood pressure, which can lead to shock, heart attack or even death. (Note: Many drugs contain nitrates, and the combination with Viagra is certainly fatal.) 12, there is a risk that the user may become dependent on Viagra. With the widespread use of Viagra, many men with normal erectile function have joined the “army of medication”, Viagra is gradually becoming a “lifestyle” drug, as if not taking Viagra will become “out “The same. Many healthy men take Viagra because they are sure it will bring something new to the mundane sex. And for a healthy young man with a high sex drive, confidence is usually enough to make him feel good in bed, and taking Viagra will give them an unprecedented boost of confidence. (Note: Clinical trials have shown that 30% of impotent men can get a better erection simply by taking a placebo (mostly made of starch). The problem arises because healthy men also become dependent on this, and once they stop using Viagra, their self-confidence is affected to varying degrees, thus creating drug dependence.) 13, Viagra’s efficacy in promoting penile erection was discovered by accident. The world’s largest pharmaceutical company – Pfizer Pharmaceuticals is located in the laboratory in Sandwich, Kent, England was initially developing a new drug for the treatment of cardiovascular disease, drug trials, they noticed a strange side effect of this drug – to participate in drug Volunteers in the trial had an easier time getting an erection after taking the new drug! This side effect made the volunteers so violent in bed that when the drug trial was over, they said they wanted to continue taking the drug. (Note: Sildenafil, developed by Pfizer, was first introduced into clinical studies as a 5-phosphodiesterase inhibitor for the treatment of cardiovascular disease. Researchers hoped that sildenafil would release the biologically active substance nitric oxide to relax cardiovascular smooth muscle, resulting in vasodilation and relief of cardiovascular disease. However, clinical studies showed that the cardiovascular effects of sildenafil did not meet the researchers’ expectations, and as a cardiovascular drug, sildenafil performed disappointingly and could not grow into a successful therapeutic agent. in April 1991, the clinical study of sildenafil was officially declared a failure, but a side effect reported by the subjects caught the researchers’ attention. Researchers found that treatment recipients were reluctant to hand over the rest of the drug after receiving the trial. Upon follow-up, it was discovered that this one drug had improved the patients’ sex lives. With permission from Pfizer executives, researchers conducted a study on the effects of sildenafil on the smooth muscle of the penile corpus cavernosum, and on March 27, 1998, received marketing approval from the U.S. Federal Food and Drug Administration, making it a product that made Pfizer’s name. The little diamond-shaped blue pill became the best-selling drug of all time, and Pfizer’s stock price doubled. (Viagra has created a value of £1.5 billion in the global drug market.) 14, had hoped to develop a “female Viagra”, Pfizer set up a female sexual dysfunction team to investigate the efficacy of Viagra in treating female frigidity. They stopped the study after comparing the effect of Viagra and placebo, which was effective for 85% of women. It seems that the mere name of Viagra is enough to be able to arouse women’s sexual desire. (Female sexual dysfunction is distinctly different from male sexual dysfunction, with men having difficulty getting an erection and women having a reduced libido, so the treatment is very different and cannot be generalized.) 15, “Viagra-style divorce” wave rushing in. Dominique Barbara, the woman who led fifteen other lawyers to create a successful law firm in Manhattan, pointed out helplessly that for every 15 to 20 new divorce cases, there is one case in which someone mentions Viagra. (Note: In fact, Viagra is not the culprit of divorce, but the main cause of divorce in the end, I think we naturally know in our hearts ……)