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TR-399 is a transdermal gel formulation of vardenafil, a phosphodiesterase type 5 (PDE5) inhibitor, being developed by Tri-Tech Biopharmaceuticals for the treatment of erectile dysfunction. Unlike oral PDE5 inhibitors, TR-399 is designed for topical application to the skin, aiming to provide localized effect with potentially lower systemic side effects. The formulation contains 5% vardenafil hydrochloride trihydrate. It is intended for once-daily continuous use and has demonstrated the ability to enhance erectile function and sexual behavior in nonclinical animal models without significant skin irritation or phototoxicity.
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