Trental is a brand name for the drug Pentoxifylline, which is used to improve blood flow in patients with peripheral vascular disease. Pentoxifylline is the only FDA-approved medication marketed as Trental. However, several other synonyms exist that represent the same active ingredient, such as Pentoxil, Flexital, and Pentoxin. These medications are available over-the-counter and come in various forms, including capsules, tablets, and injections. Trental and its synonyms act by decreasing blood viscosity, preventing blood clots, and increasing blood flow to peripheral tissues. By reducing inflammation and promoting red blood cell flexibility, Trental can alleviate symptoms of peripheral vascular disease, including claudication, leg pain, and skin ulcers.