Levitra tablets contain the active ingredient vardenafil, which is a medicine used in the treatment of erectile dysfunction (impotence). Vardenafil is called a phosphodiesterase type 5 inhibitor, and works by preventing the action of a chemical in the body called phosphodiesterase type 5.

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An erection is produced via a complex chain of events, involving signals from the nervous system and the release of chemical messengers within the tissues of the penis. One of these chemical messengers is called cyclic GMP.

Cyclic GMP causes the blood vessels in the penis to widen by relaxing a thin layer of muscle found in the blood vessel walls. This allows more blood to enter the penis, which ultimately results in the penis becoming rigid and erect.

Cyclic GMP is normally broken down by another chemical in the body called phosphodiesterase type 5. Vardenafil works by preventing the action of phosphodiesterase type 5, thus stopping the breakdown of cyclic GMP. This means that the blood vessels are kept dilated for longer, improving blood flow to the penis and maintaining an erection.

As vardenafil enhances the actions of the chemical messengers responsible for producing an erection, it will only work once these messengers are present. This means that sexual stimulation is required for it to produce and maintain an erection. The dose should be taken approximately 25 minutes to one hour before intended intercourse, and it may produce an erection in response to sexual stimulation up to five hours after taking the dose.

Levitra is an oral drug for male impotence, also known as erectile dysfunction (ED). It works by dilating blood vessels in the penis, allowing the inflow of blood needed for an erection.
Most important fact about Levitra

Levitra causes erections only during sexual excitement. It does not work in the absence of arousal and does not increase sexual desire.
How should you take Levitra?

Take one Levitra tablet about one hour before sexual activity, with or without food.
If you miss a dose...
Take Levitra only before sexual activity, but no more than once a day. Do not take two doses at once.
Storage instructions...
Store at room temperature.
What side effects may occur?

Side effects cannot be anticipated. If any develop or change in intensity, tell your doctor as soon as possible. Only your doctor can determine if it is safe to continue using Levitra.
Side effects may include:
Indigestion, flu-like symptoms, flushing, headache, runny nose, sinus inflammation

This side effects list is not complete. If you have any questions about side effects you should consult your doctor. Report any new or continuing symptoms to your doctor right away.
Why should Levitra not be prescribed?

Do not take Levitra if you are taking any nitrate-based drug, including nitroglycerin patches, nitroglycerin ointment, nitroglycerin pills, and isosorbide pills. This also includes street drugs known as "poppers," including amyl nitrate and butyl nitrate. Combining Levitra with any of these drugs can cause a dangerous drop in blood pressure.

Likewise, do not take Levitra with certain blood pressure and prostate drugs known as alpha-blockers, including doxazosin, tamsulosin, terazosin, prazosin, and alfuzosin.

If Levitra gives you an allergic reaction, do not use it again.
Special warnings about Levitra

If you have heart problems severe enough to make sexual activity a danger, you should avoid using Levitra. If you take this drug and develop cardiac symptoms (for example, dizziness, nausea, and chest pain) during sexual activity, do not continue. Alert your doctor to the problem as soon as possible.

Because Levitra has not been studied in people with cardiovascular disease, it's best to avoid this drug if you've recently had a stroke or heart failure, or if you've had a heart attack within the past 6 months. Be equally cautious if you have severe high or low blood pressure, heartbeat irregularities, or unstable angina (crushing heart pain that occurs at any time). If you develop angina after taking Levitra, seek medical attention immediately.

If you have severe kidney or liver problems, a bleeding disorder, stomach ulcer, or an inherited retinal disorder such as retinitis pigmentosa, use this medication with caution. Its safety under these circumstances has not yet been studied.

Rare cases of prolonged and sometimes painful erections (known as priapism) have been reported with Levitra. If you develop an erection that lasts more than 4 hours, seek medical treatment immediately. Otherwise, permanent damage and impotence could result.

If you have a condition that might result in long-lasting erections, such as sickle cell anemia, multiple myeloma (a disease of the bone marrow), or leukemia, use Levitra with caution. Also use caution if you have a genital problem or deformity such as Peyronie's disease.

Remember that Levitra offers no protection from transmission of sexually transmitted diseases, such as HIV, the virus that causes AIDS.