Cialis tablets contain the active ingredient tadalafil, which is a medicine used in the treatment of erectile dysfunction (impotence). Tadalafil 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. Tadalafil 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 tadalafil 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 at least 30 minutes before intended intercourse, and it may produce an erection in response to sexual stimulation for up to 36 hours after taking the dose.

Cialis 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 Cialis

Cialis 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 Cialis?

Take one Cialis tablet before sexual activity, with or without food. The best time to take Cialis depends on how and when the drug works for you, but some men are able to have an erection 30 minutes after taking it. Others are able to wait up to 36 hours after taking Cialis before engaging in sexual activity.
If you miss a dose...
Take Cialis 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 Cialis.
Side effects may include:
Arm and leg pain, back pain, flushing, headache, indigestion, muscle aches, nasal congestion
Why should Cialis not be prescribed?

Do not take Cialis 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 Cialis with any of these drugs can cause a dangerous drop in blood pressure.

Likewise, do not take Cialis with certain blood pressure and prostate drugs known as alpha-blockers, including doxazosin, terazosin, prazosin, and alfuzosin. However, you can take the alpha-blocker tamsulosin at a dose of 0.4 milligrams once a day.

If Cialis gives you an allergic reaction, do not use it again.