Silditop 50mg has the salt termed as slidenafil citrate (50 mg) as it's active ingredient. Slidenafil is specifically classified under phosphodiestrase inhibitors. It increases the blood flow to the genital organ of the male during sensual stimulation and it expands the cells so it becomes more firm for intercourse. This medicine should be taken one hour before intercourse and alcohol should be avoided Proper consultation with doctor is required before taking this medicine.