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Key Features
  • Gives a firmer and longer-lasting erection when aroused
  • Taken 30 minutes before sex and can remain effective for up to 36 hours
  • Unaffected by food consumption

About Cialis

Cialis is the brand name for the drug Tadalafil which is part of the PDE-5 (Phosphodiesterase type 5) inhibitor family. They work by increasing the blood flow to the erectile tissue in the penis, helping those with ED to get firmer and longer lasting erection when sexually aroused.

Cialis FAQs

How do I take Cialis?

Cialis should be taken around 30 minutes before sex and should not be taken with more than one to two units of alcohol. Eating a meal before taking Cialis should not delay the positive effects of the medicine. Do not take more than one tablet within a 24 hour period, and do not combine Cialis with any other ED medicines.

How quickly does Cialis work?

Cialis takes effect within 30 minutes and can remain effective for up to 36 hours meaning that compared to other ED medications, it has a faster onset of action and  its effects can last a longer amount of time. This does not mean that your erection will last 36 hours, but rather that you will have the ability to achieve an improved erection within this time frame.

How effective is Cialis at treating erectile dysfunction?

Cialis has been shown to be very effective in helping many men with ED to get an improved erection when sexually aroused.

Cialis does not treat the underlying cause of the ED. It can however help improve your confidence and reduce the anxiety and stress resulting from having the ED itself.

ED is often a symptom of a more serious underlying physical health problem - such as diabetes, high blood pressure, a high cholesterol or a hormonal condition. Most commonly it is due to underlying vascular disease (narrowing of the blood vessels). This can be an early warning sign of heart disease and stroke, particularly if you are over the age of 40. So it is really important that you have the tests we recommend with your doctor to identify and treat any underlying health issues and risk factors.

ED can also be caused by psychological problems such as stress, anxiety and depression.

What are the side effects associated with Cialis?

The side effects associated with Cialis are generally mild to moderate (due to it having a longer window of effect compared to other ED medicines any side effects can also last longer) the most common of which include:

  • Facial flushing
  • Headaches
  • Light-headedness
  • Backache
  • Indigestion
  • Stuffy nose


If you experience any chest pain when using Cialis or your erection lasts for longer than four hours then please contact the emergency services and seek medical help immediately.

Please read the patient information leaflet which comes with the medication, before taking Cialis, for a full list of potential side effects and warnings.

Does Cialis interact with other medicines?

Cialis should not be taken if you are taking certain other medications due to serious and potentially life threatening interactions. It is really important that you give us a full list of ALL the medicines you are taking everytime you use our service.

Do not use Cialis if you are taking Nicorandil or any Nitrates. 

Nitrates are found in some heart medications such as a GTN spray or tablets that you put under your tongue and isosorbide mononitrate/dinitrate used for angina, as well as in certain recreational drugs such as “poppers”, “room odorizers” and “aromas”. They can also be found in other medications so it's very important that you list all the medicines and recreational drugs you have or are taking when asked. This is because when combined with ED medications, they can cause a serious and life threatening drop in blood pressure, which can be fatal.

If you are taking alpha-blockers (such as alfuzosin, doxazosin, tamsulosin or terazosin), you must not use Cialis as it can cause a dangerous drop in your blood pressure.

This is not a full list of all the medication interactions - Cialis can interact dangerously with other medicines. Please list ALL the medicines you are taking when asked. If you subsequently start taking a new medication, before taking your Cialis please always check with our doctors first by sending a message via your patient record, to ensure the Cialis is still safe to take.

What happens if I am not suitable for a prescription? 

If our doctors think that an online consultation is not appropriate we will let you know via your patient record and refund you straight away. Please note that refunds take two to three working days to appear on your statement.

Where do I have to take the paper prescription?You can take your prescription into any pharmacy in the Republic of Ireland.

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