Resins are precipitates from strong alcoholic extracts of water-insoluble principles. They usually contain the major portion of the active principles of the drug.

Prepare the official Resina Podophylli as follows: Moisten 200 Gm. podophyllum, No. 60 powder, with 100 mils alcohol; pack it in a percolator; saturate the powder with alcohol so as to leave a stratum above. Cover percolator, and macerate the powder for 48 hours. Then proceed with the percolation, gradually adding alcohol until a sample of the percolate gives no more than a slight turbidity with water. Reduce the percolate to a thin syrupy consistency by distilling off the alcohol; then, with constant stirring, pour the syrupy extract into 200 mils distilled water which has been acidulated with 2 mils HC1, and then reduced to a temperature below 10° C. After subsidence is complete, decant the supernatant liquid, and wash the precipitate twice, by decantation, using fresh portions each time of 200 mils cold water. Dry the precipitate by spreading it in a thin layer on a strainer, and exposing it to the air in a cool place, protected from the light. If aggregated, when dry, pulverize in a mortar.

Note:

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Dose, 0.01 Gm. Take such a dose; report results:..........................................................................................

The two other official Resins are:

Resina Jalapae. Dose, 0.125 Gm. Used in compound cathartic pill. Resina Scammoniae. Dose, 0.2 Gm. Used in compound colocynth extract. These three resins have marked purgative properties.