TREANDA contains bendamustine hydrochloride, an alkylating drug, as the active ingredient. The chemical name of bendamustine hydrochloride is 1H-benzimidazole-2-butanoic acid, 5-[bis(2-chloroethyl)amino]-1­methyl-, monohydrochloride. Its empirical molecular formula is C₁₆H₂₁Cl₂N₃O₂•HCl, and the molecular weight is 394.7. Bendamustine hydrochloride contains a mechlorethamine group and a benzimidazole heterocyclic ring with a butyric acid substituent, and has the following structural formula:

TREANDA (bendamustine hydrochloride) for Injection is intended for intravenous infusion only after reconstitution with 20 mL of Sterile Water for Injection, USP and after further dilution with 0.9% Sodium Chloride Injection USP. It is supplied as a sterile non-pyrogenic white to off-white lyophilized powder in a single-use vial. Each vial contains 100 mg of bendamustine hydrochloride and 170 mg of mannitol, USP. The pH of the reconstituted solution is 2.5 - 3.5.

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