According to the National Institutes of Health (NIH), an increasing number of men are reporting problems with erectile dysfunction (ED), or the recurrent inability to get or maintain an erection. Differentiated from the more common term, "impotence," which can also cover issues regarding sexual desire and orgasm, ED affects an estimated 15 million to 30 million American men.

Typically, ED is diagnosed through gathering medical and sexual histories, a physical examination, and blood tests. Fortunately, the condition can be treated in men of all ages. Although surgery and counseling are sometimes recommended as methods of treatment for ED, the overwhelming choice for most patients and physicians is drug therapy. Patients with ED report great success with Viagra, Levitra, and Cialis. All three drugs have been approved for the treatment of ED by the Food and Drug Administration, and are available through a regular or an online pharmacy.

Viagra, the first and best-known drug for the treatment of ED, is taken one hour before intercourse. Viagra does not actually produce an erection, but allows a man to respond to sexual excitement. In essence, Viagra allows the penis to fill with blood and cause an erection. Following sex, the erection dissipates. Viagra shouldn't be used by men who are taking prescription or non-prescription drugs containing nitrates.

Today Cialis is gradually becoming the drug of choice for men with erectile dysfunction and is a medication that addresses this growing issue, it is clinically proven to work up to 36 hours after taking it providing men with flexibility when it comes to sexual relations. Most interestingly, this medication does not have to be taken when the time may not be right, although it can work in as little as 30 minutes. Therefore, whether you need the effects right now or in 12 hours time, this may be the pill for you. You can take this wonder drug when you get up in the morning and it will still be effective later in the evening when that right moment comes along. And if you have planned a romantic weekend then you can take Cialis the night before you leave for your romantic get away and will still be effective the following day or evening.

Levitra, like Viagra, increases blood flow to the penis during arousal. As with Viagra and Cialis, Levitra should not be used more than once a day, and is contraindicated for men who are taking nitrates or alpha-blockers.

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