The active ingredient of the drug ( sildenafil ) increases the blood flow to the member at the moment of sexual arousal, making it easier to achieve and maintain an erection that lasts the entire length of the relationship.
During sexual excitement, a nucleotide called cGMP is released in the body. This organic chemical relaxes the blood vessels in the penis and allows for more intense blood flow to the penis. PDE-5 is a natural enzyme that breaks down cGMP after an erection.
Imbalance during the erection process may lead to faster PDE-5 enzyme activity, which results in loss of erection or inability to achieve an erection. Sildenafil prevents the PDE-5 from working too fast, which makes it much easier to achieve and maintain an erection.