If you are taking Allopurinol while you are on Cisplatin, your doctor may need to change your Allopurinol dose. This is so your uric acid level and your gout stay under control. Do not change the dose on your own.
These medicines are often taken together with some care. Your doctor may change a dose, space them apart or check on you more often. Make sure your doctor and pharmacist know you take both.