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Erectile Dysfunction is defined as "the persistent inability to attain and/or maintain erection adequate to permit satisfactory sexual intercourse". In normal healthy males, erection of the penis takes place because when the man is sexually stimulated, certain chemicals (hormones) are released by the body. These hormones cause the arteries supplying blood to the penis to dilate (get bigger), thus increasing the flow of blood to the penis and causing the spongy tissues in the penis (called the corpora cavernosa) to become engorged and turgid. The penis therefore enlarges in size and becomes erect. In simple terms, erection is caused by an increase of blood flowing into the penis - so anything that reduces blood flow to the organ will result in inadequate erections. The use of drugs like PDE5 Inhibitors is effective because these enhance blood flow in the arteries supplying the penis. Better blood flow results in stronger erections.
What Causes Men To Get Erections?
How do Viagra and other PDE5 Inhibitors work?