What is Tadalafil? - Dosage, Side Effects & Uses

Instructor: Artem Cheprasov

Artem has a doctor of veterinary medicine degree.

This lesson briefly describes a medication known as tadalafil. You'll learn its more famous brand name, its major uses, doses, and example side effects.

What is Tadalafil?

The most famous erectile dysfunction medication is probably Viagra, the brand name for sildenafil. However, there's another pretty famous medication for this out on the market. It's called tadalafil. Doesn't ring a bell? Don't worry, you probably know it better by its trade name of Cialis.

Let's find out more about this medication's uses, dosage information, and potential side-effects.


Tadalafil has three main uses. The first one you already have a clue about. It's used to treat erectile dysfunction (ED), otherwise known as impotence. Impotence refers to a situation where a man is unable to get or keep an erection.

Another major use of tadalafil is for the treatment of benign prostatic hyperplasia. This is a condition where a gland found in men, called the prostate gland, enlarges. This is a problem for numerous reasons, one of which is that it leads to difficulty urinating. That's because the prostate gland envelops the urethra. The urethra is the tube the moves urine out of the bladder and into the outside world.

Finally, tadalafil is used to treat pulmonary arterial hypertension. This refers to increased blood pressure within the arteries of the lungs. This is a problem because it can lead to things like exercise intolerance. So, tadalafil can be given to people to help improve their ability to exercise for longer.


Since tadalafil can be given for so many different reasons, the dosage will vary based on exactly which problem it's being used to treat. Here are a few example doses:

  • To treat erectile dysfunction, tadalafil may initially be taken as a 10 mg dose, by mouth, once a day (as needed prior to sexual activity).
  • If it's being used to treat benign prostatic hyperplasia, then it may be taken as a 5 mg dose, by mouth, once a day.
  • When using tadalafil to treat pulmonary arterial hypertension, then a dose of 40 mg, by mouth, once a day might be advised by a doctor. Remember that such a 'high' dose is used for cases of 'high' blood pressure in the lungs.

Side Effects

It's very important that a doctor reviews and adjusts these doses as necessary because an inappropriate dose increases the risk of having a side-effect to the medication. These side-effects may include:

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