Allopurinol oral tablets are available in two strengths: 100 milligrams (mg) and 300 mg. Note: Allopurinol is also given as an intravenous (IV) infusion. This article addresses only allopurinol ...

What is allopurinol used for? Allopurinol is commonly used to treat gout, which is a form of arthritis caused by too much uric acid in your blood and joints. Allopurinol may also be used to lower ...

Allopurinol ... doctor will lower your dosage. Your doctor will decide your dosage based on your creatinine clearance. This is a measure of your kidney function. 150 mg per day.