Kamagra 100 mg is a medicine commonly marketed for the treatment of erectile dysfunction (ED), a condition in which a man has difficulty achieving or maintaining an erection. It typically contains sildenafil citrate, which belongs to a group of medicines called phosphodiesterase type 5 (PDE5) inhibitors. Sildenafil works by increasing blood flow to the penis during sexual stimulation, helping a man achieve and maintain an erection. It does not increase sexual desire and does not cause an erection automatically. Possible side effects include headache, facial flushing, indigestion, dizziness, and changes in vision. Kamagra 100 mg should be used only under medical guidance, as products sold under this name may not have verified quality or ingredients. It must not be taken with nitrate medicines used for chest pain because the combination can cause a dangerous drop in blood pressure.