This is a randomized clinical trial, double-blind, placebo controlled, to verify if simvastatin can improve erectile dysfunction in men with endothelial dysfunction, without any cardiac disease.It is hypothesized that the simvastatin can improve the endothelial function, improving the nitric oxide liberation in corpora cavernosa of the penis, resulting in improvement of erection.

Inclusion Criteria:

• Erectile dysfunction
• Elevated C reactive protein
• Able to adhere the protocol

Exclusion Criteria:

• Diabetes mellitus
• Cardiac disease
• Cerebral vascular disease
• Hypogonadism
• Any contraindication to simvastatin