Cialis.
Cialis is used to treat erectile dysfunction, also known as impotence, in men. This is when a man cannot get, or keep, a hard erect penis suitable for sexual activity.
 Following sexual stimulation, Cialis works by helping the blood vessels in your penis to relax, allowing the flow of blood into your penis. The result of this is improved erectile function. Cialis will not help you if you do not have erectile dysfunction.
 It is important to note that Cialis does not work if there is no sexual stimulation. You and your partner will need to engage in foreplay, just as you would if you were not taking a medicine for erectile dysfunction.
Do not take Cialis if:
You are currently taking any nitrates or amyl nitrite. Nitrates are medicines used in the treatment of angina pectoris (â€chest painâ€). Cialis has been shown to increase the effects of these drugs. If you are taking any form of nitrate or are unsure tell your doctor.
If you have had an allergic reaction in the past to tadalafil or any of the other ingredients of Cialis. Some of the symptoms of an allergic reaction may include shortness of breath, wheezing or difficulty breathing; swelling of the face, lips, tongue or other parts of the body; rash, itching or hives on the skin.
Do not take Cialis after the expiry date printed on the pack or if the packaging is torn or shows signs of tampering. If it has expired or is damaged, return it to your pharmacist for disposal.
Tell your doctor if you have allergies to any other medicines, foods, preservatives or dyes. For those who are lactose intolerant, be aware that Cialis tablets contain a small amount of lactose (approximately 200mg for the 10mg tablet and 250mg for the 20mg tablet).
 Carefully follow all directions given to you by your doctor or health care professional. They may differ from the information contained in this leaflet.