Caverta, which contains the active ingredient Sildenafil Citrate, is a medication primarily used to treat erectile dysfunction (ED) in men. Sildenafil is a phosphodiesterase type 5 (PDE5) inhibitor, and it works by increasing blood flow to the penis in response to sexual stimulation. After taking Caverta, its effects generally begin to be noticeable within 30 to 60 minutes, although the onset may vary slightly depending on individual factors like metabolism, diet, and general health. The medication remains effective for a period that allows for spontaneous sexual activity, although this window may be shorter or longer based on individual variation.