Men with erectile dysfunction are the main patients for Kamagra 100 mg. The way sildenafil citrate functions is by blocking the phosphodiesterase-type type5 enzyme. Cyclic guanosine monophosphate, which relaxes smooth muscles and promotes blood flow to particular areas of the body, including the penis, is often broken down by this enzyme. Typically, the effects of kamagra take effect 30 to 60 minutes after intake and last for 4 to 6 hours. The length of its effects varies from person to person, though. Women are not supposed to use this medication. Combining it with drugs that contain nitrates may be dangerous. If you have low blood pressure or serious problems with your heart or liver, avoid using this medication.