Used primarily to treat erectile dysfunction (ED) in adult men. It works by increasing blood flow to the penis during sexual stimulation, helping men achieve and maintain an erection. The compound is effective in cases where ED is linked to psychological, vascular, or mild to moderate neurological causes. It may also be prescribed for men with benign prostatic hyperplasia (BPH), as it can improve urinary symptoms associated with the condition. Vardenafil dihydrochloride acts as a selective inhibitor of cyclic guanosine monophosphate (cGMP)-specific phosphodiesterase type 5 (PDE5), enhancing the effects of nitric oxide, a natural chemical released during sexual arousal. The dihydrochloride salt form improves solubility and bioavailability, allowing for faster onset and consistent therapeutic effect. It is typically taken orally, shortly before anticipated sexual activity.