Trental 400 is a medication primarily used to improve blood flow in patients suffering from peripheral arterial disease (PAD), a condition that causes reduced blood flow to the limbs due to narrowed arteries. The active ingredient in Trental 400 is pentoxifylline, which belongs to a class of drugs known as hemorheologic agents. By reducing blood viscosity and improving the flexibility of red blood cells, pentoxifylline enhances blood flow and oxygen delivery to various tissues and organs. This action helps alleviate symptoms associated with PAD, such as leg pain during walking (claudication). Trental 400 is typically administered in a 400 mg extended-release tablet form, allowing for sustained release of the medication over time to ensure a consistent therapeutic effect. Patients are advised to follow their healthcare provider's instructions closely when taking Trental 400, as the dosage and treatment duration may vary based on individual health conditions and response to therapy.