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.
Strophanthinum, Strophanthin. A glucoside, or mixture of glucosides, obtained from strophanthus. A very toxic agent, to be handled with great care. Its average dose is stated in the U. S. P. to be 1-200 gr. Some authorities state it much lower. The 1-500 gr. granules are probably the most convenient way to give the drug. When there is urgent need for a heart stimulant, from one to three of these granules may be given in hot water, and then use one or two every half hour to two hours, according to urgency. It is not diuretic, and can be classed as a heart irritant. It is seldom wise to administer it for long periods.