TRENTAL® (pentoxifylline) tablets for oral administration contain 400 mg of the active drug and the following inactive ingredients: D&C Red No. 27 Aluminum Lake or FD&C Red No. 3, hypromellose USP, magnesium stearate NF, polyethylene glycol NF, povidone USP, talc USP, titanium dioxide USP, and other ingredients in a controlled-release formulation. TRENTAL is a tri-substituted xanthine derivative designated chemically as 1-(5-oxohexyl)-3, 7-dimethylxanthine that, unlike theophylline, is a hemorrheologic agent, i.e. an agent that affects blood viscosity. Pentoxifylline is soluble in water and ethanol, and sparingly soluble in toluene. The CAS Registry Number is 6493-05-6. The chemical structure is:

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