Does anyone know of any documented findings on the combined use of Yohimbe extract with Viagra?

Question

Both are designed to improve male performance potentially caused by E.D.

Answer 1

The mechanisms of action of the two agents are entirely different and I'm not aware of rigorous literature which supports increased efficacy of sildenafil when combined with Yohimbine root extract.

Answer 2

This is a very, very bad idea...theoretically.  

I know of no actual studies.  However, the actual effects of the drugs would exert a combined amount of stress on the cardiovascular system.  Kind of like if you drink alcohol and take ambien, the combined effect of both CNS depressants can kill you.