This section is from the book "A Practitioner's Handbook Of Materia Medica And Therapeutics", by Thos. S. Blair. Also available from Amazon: A Practitioner's handbook of Materia Medica and Therapeutics.
Yohimbinum, Johimbin. An aphrodisiac recently exploited for the cure of neurasthenic impotence. Use Merck's yohimbine in 1-10 gr. doses, or the homeopathic 1% solution in 10 drop doses. Hypodermic tablets contain 1-12 gr.