Allopurinol (pronounced al-oh-pure'ri-nol) can be used to treat and prevent gout. It can prevent gout attacks and protect your joints from damage if taken regularly.
Allopurinol is a medicine used to lower levels of uric acid in your blood.
If you produce too much uric acid or your kidneys do not filter enough out, it can build up and cause tiny, sharp crystals. These crystals can form around your joints, which cause the swollen and painful symptoms of gout. Crystals can also collect inside the kidneys and damage them.
It may also be prescribed if you're having some types of cancer treatment. Some treatments can cause a build-up of uric acid.