Cialis works by preventing the action of a chemical in the body called phosphodiesterase type 5. This means that the blood vessels are kept dilated for longer, improving blood flow to the penis and maintaining an erection.

Before taking Cialis

Before taking Cialis make sure your doctor or pharmacist knows:

• If you suffer from heart problems including a recent heart attack, or heart failure
  
• If you have had a stroke in the last six months
  
• If you have liver or kidney problems
  
• If you have problems with your eyesight
  
• If you suffer from hereditary problems of galactose intolerance, the Lapp lactase deficiency, or glucose-galactose malabsorption
  
  

How to take Cialis

• Take your medicine at least 30 minutes before sexual activity.
  
• Cialis should be taken once daily only.
  
  

Getting the most from your treatment

• Cialis may still be effective up to 36 hours after taking the tablet.
  
• 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.
  
• Drinking alcohol may affect your ability to get an erection.
  
  

Side Effects

Along with their useful effects all medicines can cause unwanted side effects, which usually improve as your body adjusts to the new medicine. Speak with your doctor or pharmacist if any of the following side effects continue or become troublesome:

Headache, indigestion, dizziness and nasal congestion.

How to store Cialis

• Keep all medicines out of the reach of children.
  
• Store in a cool, dry place, away from direct heat and light.
  
  

Important information about all medicines

• Make sure that the person prescribing this medicine knows about any other medicines that you are taking. This includes medicines you buy and herbal and homeopathic medicines.
  
• If you buy any medicines check with a pharmacist that they are safe to take with your other medicines.
  
• Before taking this medicine tell your doctor if you have ever had an allergic reaction after taking any medicine.
  
• Never take more than the prescribed dose. If you suspect that you or someone else has taken an overdose of this medicine go to the accident and emergency department of your local hospital at once. Always take the container with you, if possible, even if it is empty.
  
• If you are having any treatment like an operation or dental treatment tell the person carrying out the treatment which medicines you are taking.
  
• Always read the printed information leaflet that comes with your medicine.
  
• This medicine is for you. Never give it to other people even if their condition appears to be the same as yours.
  
• Never keep out of date or unwanted medicines. Take them to your local pharmacy which will dispose of them for you.
  
• If you have any questions about this medicine ask your pharmacist.