Manforce 100 mg is a medication used to treat erectile dysfunction (ED) in men. It contains sildenafil citrate as its active ingredient, which belongs to a class of drugs called phosphodiesterase type 5 (PDE5) inhibitors. Manforce 100 mg works by inhibiting the enzyme PDE5, which regulates blood flow in the penis. By blocking PDE5, it allows for increased blood flow into the penile tissues during sexual stimulation. This improved blood flow is crucial for achieving and maintaining an erection.