I personally don't tolerate oral Yohimbine HCL very well. Although I usually mix it with Ephedrine hcl, so this could be the reason. I have had fairly good results with E/C, tyrosine and green tea. I usually take the tyrosine around 30 minutes before the E/C on an empty stomach and it works well.
it is said that since fat tissue has a poor blood suppy that oral yohimbine isn't as effective because it doen't reahc the tissue. One thing that has worked for me in the past is the topical Yohmibine from Avant (lipoderm-y). There is going to be an "ultra" version comming out soon. This will deal with the water retention issue and also contain other fat burning compounds.