Yohimbine HCL pills typically come in 2.5mg doses. If you're taking straight Yohimbine HCL, be sure to look up proper dosages, DO NOT take 20mg!! Start with 2.5 or 5mg, assess and see how you feel, the side effects hit some more than others. SLOWLY increase dosage incrementally, again, do not take 20mg right off the bat. Recommended dosage is weight dependent. Lyle McDonald has some great info out there if you google his yohimbine recommendations.