Viagra und das Stroboskop

Die Wirkung auf den männlichen Penis ist lediglich eine Nebenwirkung! Unter anderem hat Viagra offenbar auch den Effekt, dass seine Konsumenten in schnellen Rhythmus blinkende Lichter nicht mehr auseinanderhalten können…

(eurekalert) (…) Originally developed as a heart drug, sildenafil citrate (Viagra®) has several side effects, not least of which is that it helps to alleviate erectile dysfunction by prolonging the relaxation of smooth muscle in the corpora cavernosa of the penis, thereby helping to maintain the blood flow required for an erection. A less desirable side effect is that it inhibits the enzyme phosphodiesterase, PDE6, which is in the cone and rod photoreceptors of the eye and is involved in the transduction of photons into neural signals that are decoded by the visual system. The precise effect of Viagra on human visual performance, however, remains somewhat equivocal and anecdotal.

By measuring the ability of human observers to detect flickering lights under various conditions, a team of researchers, including Andrew Stockman of the Institute of Ophthalmology, London, has demonstrated that therapeutic 100 mg doses of Viagra cause transient losses in the sensitivity to flicker. These losses range in severity, from mild to moderate, among observers. In those more affected observers, the losses in flicker sensitivity caused by the inhibition of PDE6 by Viagra are consistent with an almost doubling of the time over which visual events are integrated by the visual system. (…)

Stockman et al.: „Viagra slows the visual response to flicker.“ Current Biology 16, pages R44-R45, January 24, 2006 DOI 10.1016/j.cub.2006.01.016