Trental (generic: pentoxifylline) is a prescription medication used to reduce the symptoms of intermittent claudication (pain in the legs when walking due to narrowing of blood vessels). Trental belongs to a group of drugs called methylxanthine derivatives, which improve blood flow by decreasing the thickness of blood.

This medication comes in tablet form and is usually taken 3 times a day, with meals.

Common side effects of Trental include upset stomach, vomiting, gas, and headache. Trental can also cause dizziness. Do not drive or operate heavy machinery until you know how Trental affects you.