What is Cialis?
Cialis tablets are used to treat erectile dysfunction. They work by blocking PDE5, the chemical responsible for stopping an erection. If this chemical is blocked, the arteries in the penis are able to open wider, increasing the blood flow to the penis. This means, that men who are unable to achieve or maintain an erection, are able to engage in satisfactory sexual intercourse. Cialis tablets contain the active ingredient Tadalafil.

What are the key benefits of Cialis?
Cialis has been shown to significantly improve the ability of obtaining a hard erect penis suitable for sexual activity. Cialis (Tadalafil) can work for up to 36 hours, allowing a man to take the tablet plenty of time before he wishes to have sex. This is where Cialis differs from other impotence medicines - which only last up to 5 hours. Cialis should be taken at least 30 minutes before the couple wishes to have sex. The speed of action is not affected by food. Cialis has been shown to work in many clinical trials but it will not work for some men. It has been shown to improve the ability for most men with erection problems to have successful sex.

Warnings
Cialis should not be taken more than once a day.
This medicine may cause dizziness and so may affect your ability to drive or operate machinery safely. Do not drive or operate machinery until you know how this medicine affects you and you are sure it won't affect your performance.
If this medicine is taken with alcohol it may cause a drop in blood pressure that might make you feel dizzy. In addition, alcohol can impair sexual performance.
You should avoid drinking grapefruit juice while taking this medicine, as it may increase the level of this medicine in your blood and hence increase the risk of side effects.
If you get an erection that lasts longer than four hours (priapism), consult a doctor immediately. Treatment of this condition should not be delayed more than six hours, as this can cause damage to the erectile tissue in the penis and irreversible erectile dysfunction.
If you experience a sudden, partial decrease or loss of vision in one or both eyes you should stop taking this medicine and consult your doctor immediately.

Precautions
Tadalafil tablets like Cialis should be taken with extreme caution by anyone who is predisposed to prolonged erections. This includes patients suffering from:
- sickle cell anaemia
- multiple myeloma
- leukaemia
- a history of recurrent prolonged erections
- decreased kidney function
- decreased liver function
- cardiovascular disease (involving the heart and blood vessels)
- Peyronie's disease, severe scarring, curvature or abnormality of the penis
- anyone taking medication for high blood pressure