Erect penis but no ejaculation after taking Viagra?

Viagra and similar preparations seem like wonder drugs to many older men, but they affect erectile function rather than ejaculation or libido. The nerve supply to the male genitalia that controls ejaculation is through the sympathetic system, which is responsible for acts as an accelerator. Conversely, erections are controlled by the parasympathetic nervous system, which acts as a brake.

Libido is controlled by several parts of the brain, another example of the truism that sex is as much about what happens between the ears as between the legs. Treatment you are having for your high blood pressure could well affect your ejaculatory powers.

Viagra was the first of the drugs to treat impotence and, therefore, its action is less effectively targeted on the genitalia. It dilates the penile arteries, which increases the blood supply to the penis and causes it to engorge.

Viagra’s power to dilate arteries also increases the blood flow through the retina so that vision may acquire a pink hue, and blood can accumulate in the limbs, temporarily taking it away from the brain, leaving patients feeling dizzy. The drop in blood pressure may also affect the coronary circulation.

- DR THOMAS STUTTAFORD

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