Natural pharmaceuticals are medicines extracted from plants and other organisms, and the best-known examples (quinine from cinchona bark for malaria, salicylates from willow for pain and fever, caffeine from coffee) really do work. The difficulty is not whether they work but how strong any given preparation is, because potency varies with the plant and the extraction. A community should rely first on compounds with a wide gap between a useful and a harmful amount, and treat every home-made preparation as being of unknown strength.
Part of Organic Chemistry
Medicines derived from plants and organisms, the chemistry of extracting them, and why their strength and safe dose cannot be assumed.
What The Carrier’s Table Shows
The carrier lists six plant medicines with a use and a danger level. It rates quinine as moderate (overdose causes deafness), willow salicin as low, morphine and codeine from poppy as very high (extremely addictive), caffeine as low in normal doses, foxglove digitalis as very high with a narrow therapeutic window, and nicotine from tobacco as high and an insecticide rather than a medicine.
Two caveats on that table. First, the carrier groups all six as alkaloids. Quinine, morphine, codeine, caffeine and nicotine are nitrogen-containing bases of that class; salicin (willow) is a glycoside, and the digitalis compounds in foxglove are cardiac glycosides, so the grouping is looser than the chemistry. Second, the column “danger level” is a qualitative ranking, and the numbers in the carrier’s own tip box are not repeated here.
Wide And Narrow Margins Decide What To Make
A medicine is useful because a small amount helps. It becomes dangerous when the amount that helps and the amount that harms are close, which the carrier’s own wording marks for foxglove as a “narrow therapeutic window”. The practical sorting for a rebuilding community is:
- Prefer wide-margin preparations, such as willow bark tea and well-understood herbal infusions. See Aspirin from Willow and Herbal Medicine.
- Treat quinine as a scarce, specific tool, with its own page: Quinine Extraction.
- Leave narrow-margin plants alone unless trained help exists. This corpus does not publish extraction procedures or doses for compounds such as the digitalis and opium families; for painkilling in an emergency see Herbal Anesthetics.
What You Need
- A reliable plant identification. Misidentification is the most common cause of plant poisoning; see Poisonous Plants.
- A written record of the plant, part, season, preparation and the outcome of every use.
- A willingness to say “unknown strength” and act on it.
Method: Using A Plant Medicine Responsibly
Step 1: Choose the wide-margin option for the complaint if one exists.
Step 2: Prepare it the same way each time and write down how.
Step 3: Give the smallest amount that the corpus’s dosing pages support for a person’s size, using Dosage Calculation.
Step 4: Watch for the effect and for harm before repeating.
Why Strength Is Unknowable At Home
Potency varies with the species and variety, the plant part, the season of harvest, growing conditions, drying and storage, and extraction method. The detailed argument is in Standardization. The consequence is that a dose that worked once tells you little about the next batch.
Common Mistakes
- Equating “natural” with “mild”. Several of the most potent poisons known are plant-derived.
- Concentrating a plant to “improve” it. Concentration raises both the effect and the danger of mistaking the dose.
- Giving a home-made preparation to a child or an old person as if it had a labelled dose.
Safety
The dose is not a property of the plant
The same plant can be harmless one season and dangerous the next. Never extract, concentrate or dose a narrow-margin compound at home; if you cannot find a published, tested dose for the exact preparation, do not guess one. Keep all preparations out of children’s reach, labelled and dated. See Dosage and Safety.
What’s Next
- Learn next: Alkaloid Extraction — the chemistry principle and its limits
- Combine with: Tinctures and Extracts — the preparations most plants are used in