Course 13: Botanical Medicine
Lesson 10 of 12. These notes synthesize uploaded historical botanical lectures with separately identified current safety guidance. Traditional uses are not evidence of clinical efficacy or a prescribing directive.
Pyrrolizidine alkaloids
- The 2018 toxicity lecture emphasizes unsaturated pyrrolizidine alkaloids and hepatic sinusoidal obstruction risk. Examples include comfrey and certain other species. Species, contamination and exposure vary; risk may arise from repeated ingestion.
Dangerous alkaloids
- Aconitum species contain highly toxic diterpenoid alkaloids capable of dysrhythmia and neurological toxicity. Atropa and Datura species contain tropane alkaloids associated with anticholinergic toxicity. Conium maculatum is poison hemlock, distinct from the plant commonly called water hemlock (Cicuta).
Cardiac and cyanogenic glycosides
- Digitalis and lily-of-the-valley can produce severe cardiac glycoside toxicity. Cyanogenic glycosides in certain seeds can liberate cyanide under some conditions. These are poisoning topics, not therapeutic self-care suggestions.
Correct a source misclassification
- The uploaded lecture associates gossypol with furocoumarins; gossypol is instead a polyphenolic compound from cottonseed. Treat the older handout as a learning prompt and verify chemistry in reliable modern references.
Urgent action
- Suspected poisonous plant ingestion, altered mental status, arrhythmia, severe vomiting, seizures or cardiopulmonary symptoms requires immediate poison-centre/emergency assessment. Do not induce vomiting or substitute home remedies.
Applied clinical case
A patient has palpitations, vomiting and hypotension after ingesting an unknown garden plant resembling monkshood. What is the priority?
Show model reasoning and clinical disposition
Potential aconitine poisoning is life-threatening. Arrange emergency care and poison-centre consultation, preserve a sample or photograph for expert identification and support resuscitation.
Knowledge checks
- Differentiate Conium from Cicuta.
- Name effects of cardiac glycosides.
- Why is gossypol misclassified in the historical handout?
Source and safety links
- Health Canada: Natural Health Products (licensing, NPN, risk) (external)
- NCCIH: Herbs at a Glance (evidence and safety monographs) (external)
- NCCIH: Herb–Drug Interaction Evidence Digest (external)
Downloadable study materials
- Botanical Safety and Toxicity Matrix (PDF)
- Formulation and Posology Worksheet (PDF)
- Herb-Drug Interaction Checklist (PDF)
- Botanical Herb and Action Reference (PDF)
- Complete Botanical Medicine Handbook (12 Lessons) (PDF)
- Exam-Focused Easy-Read Student Handbook (PDF)
- Botanical Medicine 300 MCQs with Explained Answers (PDF)