What Viagra does is simple: Viagra causes a man who is sexually stimulated to get an erection.
How does Viagra do that? And why does Viagra work only if the man is sexually stimulated? For that matter, what causes an erection in the first place?
When a man is sexually stimulated, a sequence of chemicals is released into his blood stream, the culmination of which is the release of a hormone called Cyclic GMP that acts to dilate the blood vessels going to his penis. When blood flow into the spongy tissues of the penis increases, the organ becomes turgid and erect.
Cyclic GMP does not last long at its site of action, being destroyed by an enzyme termed PhosphoDiEsterase or PDE. If the action of this enzyme could be inhibited, then the naturally produced Cyclic GMP would last longer, blood flow into the penis would be enhanced, and the man would have a more turgid penis - which in effect means a harder erection.
The value of viagra, therefore, is that it enhances the action of a man's natural Cyclic GMP and give him a harder erection. Viagra do not give a man a spontaneous erection - all that Viagra does is makes him more Erectable, or more responsive to natural sexual stimulation.
Here are some real viagra users feedbacks:
Question: Anyone let me know what happens when you take viagra.How hard do you go and how long does it last.
Answers:
Chances are good that you'll get a whole lot harder than you've been getting recently. You might last longer, or repeat more often than usual, too. These drugs definitely work.
They can also have some very bad side effects. More and more men are reporting loss of and/or decrease in vision and hearing while using these ED drugs. This can be permanent. In short: these drugs can make you blind and deaf. They can also cause chronic tinnitus (ringing in the ears). These adverse reactions only seem to happen in a small percentage of users, but they do happen, and the drug companies and doctors are still pretty clueless as to "why."
I suppose that when you're 20 these pills mean nothing to you but when you're 60 and even when everything is still working fine, these babies wipe away those 40 years like magic. Cialis and Viagra definitely work and since there's nothing like a boner with a capital O, you get your money's worth in this case.
Assuming you will heed the warnings regarding potential side effects, they really help if you are having difficulty becoming erect or holding an erection for a satisfactory period of time. Viagra has a relatively short life and needs to be taken 30 to 45 minutes before working well. Cialis has a longer life and so you can take it sevseral hours before it is needed. My own experience has been that a dose of either is helpful for just one climax. Perhaps in a younger person, that may not be the case. I usually do not have a problem getting erect but the drug gives me a significantly firmer erection and reduces any concern about premature loss of the erection.
blood vessels to relax and expand. For men who have erectile difficulties due to circulatory issues, the effects of these meds usually make it possible to get and maintain a better quality erection. For men with perfectly normal erectile capabilities, use of these drugs may very well increase the "hardness" and duration of your erection. They can also induce priapism. (If you're not familiar with priapism... look it up on Wikipedia.)
These pills won't magically induce a hard-on. They can make one possible for a man who otherwise couldn't get one. The rest of the natural processes must be in order. In other words... you must become sexually aroused. Also, for men who have erectile difficulties due to psychological and/or neurological issues these drugs are virtually useless. Again, they work by increasing blood flow in the penis.
The effects of these drugs are not completely selective. Blood flow will be affected in other parts of the body and in the brain; not just in the penis. That's how the odd, unlucky user ends up with a stroke of the optic nerve, or damage to the inner ear. These drugs can also cause chest pains and other unpleasant, alarming and dangerous side effects.
ED drugs are now amongst the most popular recreational drugs in the history of modern medicine. If you're considering using an ED drug, I'd be sure to have a good,long conversation with your physician before you consider taking them. Ask a lot of questions about the side effects.
I switched from Viagra to Cialias 20mg. Viagra lasts only for about 4 hours; Ciali 20mg lasts 36 hours, which is advertised and true for me. My wife and I like sex in the morning, so I wake up; take a pill; shave my torso/gential hair, and within an hour, with some stimulation, I am stronger than usual when I don't use it. Don't use for every session though. Now I buy it from Canada @ $5.00/pill vs $15+ from American pharmacies.
only used generic but usuallly works (some are rubbish). But once you can get excired it keeps you going harder or longer for sure.
Question: What does it feel like? i heard you can fuck for ages with it
No, once you cum it's pretty much over. It does help get you hard and hold it that way until a climax. If you don't have trouble getting or keeping an erection, it helps. There are some risks but they a rare. I wouldn'y suggest taking it or any Rx if you don't need it.
i can cum several times a day and with Viagra i stil can plus a little easier to get hard more quickly aftr i cum
I have tried a couple of tablets but did not really notice any difference!! I can hold an erection without it so that's probably why. As I get older I might need it!!
Generic drug is simply a drug identified by its chemical name rather than its brand name.
A generic must contain the same active ingredients as the original formulation. According to the U.S. Food and Drug Administration (FDA), generic drugs are identical or bioequivalent to the brand name counterpart with respect to pharmacokinetic and pharmacodynamic properties. By extension, therefore, generics are identical in dose, strength, route of administration, safety, efficacy, and intended use. In most cases, generic products are available once the patent protections afforded to the original developer have expired.
http://en.wikipedia.org/wiki/Generic_drug
In many countries generics are sold in farmacy stores openly. It's the patent law what does not allow selling them in U.S. freely. Some sellers may offer low quality drugs, but this is always a risk when you buy on-line in unfamiliar stores. Generics are, however, essentially cheaper.
Important safety information
Do not take VIAGRA if you take nitrates, often prescribed for chest pain, as this may cause a sudden, unsafe drop in blood pressure.
If you experience chest pain, nausea, or any other discomforts during sex, seek immediate medical help.
In the rare event of an erection lasting more than 4 hours, seek immediate medical help to avoid long-term injury.
If you are older than age 65, or have serious liver or kidney problems, your doctor may start you at the lowest dose (25 mg) of VIAGRA. If you are taking protease inhibitors, such as for the treatment of HIV, your doctor may recommend a 25-mg dose and may limit you to a maximum single dose of 25 mg of VIAGRA in a 48-hour period.
In very rare instances, men taking VIAGRA reported a sudden decrease or loss of vision. It is not possible to determine whether these events are related directly to these medicines or to other factors. If you experience sudden decrease or loss of vision, stop taking VIAGRA, and call a doctor right away.
If you have prostate problems or high blood pressure for which you take medicines, your doctor may start you on a lower dose of VIAGRA.
VIAGRA should not be used with other treatments that cause erections. VIAGRA should not be used with REVATIO as REVATIO contains sildenafil, the same medicine found in VIAGRA.
VIAGRA does not protect against sexually transmitted diseases, including HIV.
The most common side effects of VIAGRA are headache, facial flushing, and upset stomach. Less commonly, bluish vision, blurred vision, or sensitivity to light may briefly occur.