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The active component of kamagra pills is sildenafil. Sildenafil belongs to the pharmacological class of phosphodiesterase type 5 (PDE5) inhibitors. These medications are mostly used to treat male erectile dysfunction (ED).Sildenafil works by inhibiting the activity of phosphodiesterase type 5. 

A necessary substance that promotes smooth muscle cell relaxation and penile blood channel dilatation is cyclic guanosine monophosphate (cGMP).