Not sure what alpha-yohimbe is but it is not the interaction between creatine and yohimbe but the yohimbe-tyrosine interaction.
Edit, yea the AM link was wrong. But here is the info I found originally. Maybe Tank/Pt can shed some more light.
Tyrosine which according to doctors in just as bad to mix with MAOI and is even worse to min Yohimbine, because Yohimbine is a Tyrosine Hydroxylase petentiatos, which means that instead of normal MAOIS which block catecholamins metabolism and cause dangerous interactions because of their increased concentration, Yohimbine both increases the production of Catecholamins AND blocks their further metabolism, which rougly makes it twice as dangerous from Tyramine.
Herbal Yohimbine is MORE dangerous than pure Yohimbine.
Will you please now admit that you failed to Google that apart from Tyramine Yohimbine shouldn't also be combined with Phenylalanine and Tyrosine andconsider changing your irresponsible FAQ to say that this combo is not recommended by any doctor and pharmacist on this planet and the if somebody tries it he is gambling with hypertension crisis?
Or will you still cross fingers hoping nobody dies?