Tadalafil is a phosphodiesterase type 5 (PDE5) inhibitor, similar to sildenafil (found in Viagra) and vardenafil (found in Levitra). It works by increasing blood flow to the penis during sexual stimulation, allowing men to achieve and maintain an erection. Tadalafil has a longer duration of action compared to other PDE5 inhibitors, with effects lasting up to 36 hours.
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