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What is Nizagara 100? It is a drug that treats ED and PAH. The active ingredient in this drug is sildenafil citrate, which is a phosphodiesterase type 5 (PDE5) inhibitor. PDE5 is an enzyme that degrades cyclic guanosine monophosphate (cGMP), which handles relaxing the smooth muscle in the penis and increasing blood flow. How does it work? The drug works by i...