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cobra 120 is one of the most popular sildenafil generics on the market that is used to cure male sexual problem erectile dysfunction. The medicament is suitable for treating the first signs of impotence. The active ingredient of COBRA 120mg is 120 mg of sildenafil citrate. It belongs to the class of medicines known as PDE-5 inhibitors. Sildenafil increases blood flow to the penis following sexual stimulation and does this by blocking the enzyme responsible for cGMP breakdown.