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.
Jalapa, Jalap. This is an old remedy little used at present. It is an active cathartic, principally influencing the small intestine. The doses as now given are-extract, 2 to 5 gr; compound powder, 20 to 60 gr.; resin, I to 3 gr.
The old "Beach's anti-bilious physic" was composed of powdered jalap, 8 K; powdered senna, I pound; ginger, I K. Triturate together and give a large teaspoonful, in sweetened water, at one dose. This mixture is effective in case of impacted rectum. A dose can be given every six hours until free evacuation results. Jalap combines well with santonine as a vermifuge, and is a useful laxative, in moderate doses, in cases where hemorrhoids contraindicate stimulating purgatives.