Vardenafil hydrochloride trihydrate is primarily used in the treatment of erectile dysfunction (ED) in men. It works by increasing blood flow to the penis, enabling the achievement and maintenance of an erection during sexual stimulation. This medication is often prescribed when other treatments have not been effective or are not suitable. It is typically taken orally, about 25 to 60 minutes before sexual activity, and its effects can last for several hours. Patients are advised to follow their healthcare provider's instructions carefully to minimize potential side effects and ensure optimal results.