Sildenafil is a well-known medication that works by increasing blood flow to the penis. It belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. By inhibiting the PDE5 enzyme, Sildenafil allows for the relaxation of smooth muscle cells in the blood vessels of the penis, leading to improved blood flow. This increased circulation is crucial for achieving and maintaining an erection, making Sildenafil effective for men with physical causes of ED.
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