Scopolamine — Hyoscine (Tropane Alkaloid · Motion Sickness · Transdermal Patch · Antiemetic)
| Compound | Scopolamine (Hyoscine) |
| Chemical class | Alkaloid — Tropane (Scopine ester of tropic acid; L-Hyoscine) |
| CAS | 51-34-3 |
| Primary source | Datura stramonium (jimsonweed), Scopolia carniolica, Hyoscyamus niger, Atropa belladonna |
| Key applications | Pharmaceutical: motion sickness (transdermal patch), preoperative nausea, chemotherapy nausea; informational reference |
| Claim strength | High (as pharmaceutical antiemetic); Informational only |
| Typical form | Transdermal patch (Transderm Scop); injection; oral; not a dietary supplement |
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Name origin: From Scopolia (the genus from which it was first isolated; named after Giovanni Antonio Scopoli, 18th-century Italian naturalist). Also known as hyoscine (from Hyoscyamus). Scopolamine is the L-(-)-enantiomer of hyoscine — an epoxide-containing tropane ester that distinguishes it structurally from atropine (no epoxide ring). The epoxide bridge significantly increases CNS penetration relative to atropine. Traditional use: Datura and related plants have been used across indigenous cultures globally (Aztec, Native American, Hindu, ancient Greek) as hallucinogens, anaesthetics for surgery, and in rituals. The potent amnestic properties of scopolamine were exploited historically: “twilight sleep” (scopolamine + morphine) was used in obstetrics in the early 20th century to produce anaesthesia with no memory of childbirth. Scopolamine’s amnestic properties are the basis for its historical use as a “truth serum” (subjects under scopolamine may confabulate or be more easily led, but the information obtained is not reliable — it is not a true truth serum). Current pharmaceutical applications: (1) Motion sickness prevention (Transderm Scop 1 mg/72h transdermal patch — most effective OTC/prescription motion sickness agent); (2) Postoperative nausea and vomiting prevention; (3) Chemotherapy-induced nausea; (4) Intramuscular premedication (to reduce secretions and produce sedation); (5) Ophthalmic cycloplegia. Supplement status: Pharmaceutical drug; not a dietary supplement.
Scopolamine — Pharmaceutical Context
Motion sickness — most effective pharmacological prevention: Scopolamine transdermal patch (1 mg over 72 hours, applied behind the ear 4 hours before travel) is the most effective pharmacological agent for motion sickness prevention — superior to oral antihistamines (promethazine, dimenhydrinate) and oral scopolamine in comparative trials. The transdermal route provides sustained drug delivery with fewer CNS side effects than oral scopolamine. FDA-approved for motion sickness prevention. Pharmaceutical evidence: High.
Preoperative nausea prevention: Transdermal scopolamine applied the evening before surgery significantly reduces postoperative nausea and vomiting (PONV) incidence in multiple RCTs. It is particularly effective in patients at high PONV risk (female sex, non-smoker, history of PONV, opioid anaesthesia). Antiemetic properties are mediated by M1 receptor antagonism in the vomiting centre and vestibular nuclei. Pharmaceutical evidence: High.
Scopolamine as “truth serum” — historical misuse: Scopolamine’s amnestic and sedating properties were exploited by various intelligence services in the 20th century as an interrogation aid (referred to as “Narcoanalysis”). Scientific and legal consensus is that scopolamine does not produce reliable truth-telling — subjects under its influence confabulate, comply with leading questions, and may produce false information. It is not a true truth serum. This application has been condemned by medical ethics bodies and is considered a form of torture in many legal frameworks. Historical reference.
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Frequently Asked Questions — Scopolamine
How does the Transderm Scop patch work for motion sickness?
The Transderm Scop patch delivers scopolamine through the skin over 72 hours from a reservoir through a rate-controlling membrane and drug-in-adhesive layer. The patch is applied behind the ear (mastoid region) where the skin is thin and highly permeable. Scopolamine accumulates in the bloodstream gradually, reaching steady-state plasma levels within 6–12 hours. The antiemetic mechanism: M1 receptor antagonism in the vomiting centre (area postrema) and vestibular nuclei reduces the mismatch signals from the vestibular system and reticular formation that generate motion sickness.
What are the side effects of the Transderm Scop patch?
Most common: dry mouth (approximately 67% of patients), drowsiness (~17%), blurred vision (~16%), dizziness (~12%). Confusion and memory impairment in elderly patients (anticholinergic CNS effects — elderly are more susceptible to tropane anticholinergic CNS toxicity). Acute angle-closure glaucoma is a rare but serious risk (scopolamine can precipitate IOP crisis by dilating the pupil and narrowing the anterior chamber angle in susceptible individuals). Hands should be washed after applying the patch to avoid accidental eye contact causing unilateral mydriasis (diagnostic confusion).
Can scopolamine be used for chronic nausea conditions?
Scopolamine’s motion sickness and PONV evidence base does not directly extend to chronic nausea conditions (gastroparesis, hyperemesis gravidarum, chemotherapy-induced nausea beyond acute context). For chronic nausea, the anticholinergic side effects (dry mouth, constipation, urinary retention) become more problematic with prolonged use. In specific chemotherapy contexts, scopolamine has been used as part of combination antiemetic regimens. Medical supervision is required for any off-label chronic use.
What plants contain scopolamine besides Datura and belladonna?
Scopolamine occurs across multiple Solanaceae genera: Datura spp. (jimsonweed, thorn apple — all parts very toxic), Brugmansia (angel’s trumpet), Scopolia spp., Hyoscyamus spp. (henbane), and in smaller amounts in Atropa belladonna. Brugmansia is the source of several Caribbean criminal poisonings (“scopolamine poisoning” or “devil’s breath”) where victims were incapacitated and robbed or exploited while under scopolamine’s amnestic effects. Scopolamine-based criminal dosing is a significant public safety concern in South America.
Related compounds: Atropine, Hyoscyamine, Pilocarpine, Cocaine
Claim-strength scale – High = multiple human RCTs; Moderate = limited trials or strong preclinical convergence; Emerging = early-stage lab or animal data.
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