California Poppy
PapaveraceaeEschscholzia californica
Also known as: Golden Poppy, Copa de Oro, Gold Poppy
clinical_notes Clinical Summary
California Poppy (Eschscholzia californica) is a Western North American herb from the Papaveraceae family containing unique isoquinoline alkaloids (californidine, escholtzine, protopine) that modulate GABA-A receptors and possibly opioid receptors, producing gentle sedative, anxiolytic, and analgesic effects.
Unlike its distant relative the opium poppy, it contains no morphine or codeine and is non-addictive.
Clinical evidence from one double-blind RCT (264 patients) supports use for mild-to-moderate anxiety.
Traditional and observational data support insomnia, nervous agitation, and pain applications.
Dose-dependent effects range from anxiolytic (lower doses) to sedative/analgesic (higher doses).
Pregnancy Safety
No published safety studies in pregnancy. Contains alkaloids with unknown fetal safety profile. Avoid during pregnancy as a precaution despite low opiate content.
Lactation Safety
Insufficient safety data. Alkaloids may pass into breast milk. Avoid during lactation as a precaution.
warning Contraindications
- Concurrent use with CNS depressants, sedatives, opioids, benzodiazepines (avoid)Theoretical
- Pregnancy (avoid)Theoretical
- MAO inhibitors (MAOIs) (avoid)Theoretical
vital_signs Clinical Profile
Primary Indications
- check_circle insomnia
- check_circle anxiety
- check_circle neuralgia
- check_circle pain
- check_circle migraine
- check_circle stress
- check_circle nervous agitation
- check_circle bed-wetting in children
- check_circle muscle spasm
Therapeutic Actions
System Affinities
- check_circle nervous system
- check_circle cardiovascular
- check_circle musculoskeletal
labs Active Constituents
californidine
escholtzine
protopine
allocryptopine
sanguinarine
chelerythrine
reticuline
N-methyllaurotetanine
aporphine alkaloids
history_edu Traditional Use
No TCM data available for this herb yet.
Traditional Uses Across Healing Systems
While many herbs lack controlled clinical trials, centuries of traditional practice across cultures provide valuable insight into their therapeutic applications.
Roots chewed for oral and dental pain; plant used as tea for headaches, anxiety, insomnia, and fever
Roots were applied as poultice to wounds for topical pain relief. Plant was used as a gentler pain remedy than related Papaver species.
Nervine sedative and analgesic for insomnia, anxiety, neuralgia, and pain; safe alternative to stronger sedative herbs
Health Canada authorizes a product standardized to 0.8% isoquinoline alkaloids for use as analgesic and mild sedative. Considered a gentler and non-addictive alternative to opium poppy.
spa Parts Used
aerial parts
- insomnia
- anxiety
- pain
- nervous agitation
Aerial parts (leaves, flowers, stems) harvested during flowering. Used as tincture (1:5, 60% ethanol), infusion (tea), or powder. Health Canada approves standardized 0.8% isoquinoline alkaloid extract as analgesic and sedative.
root
- toothache (topical)
- stronger analgesic and sedative action
Root contains higher alkaloid concentrations than aerial parts. Traditionally chewed by Native Americans for dental pain. Not generally used in commercial preparations due to higher potency.
shield Safety
Contraindications — Evidence Basis
Concurrent use with CNS depressants, sedatives, opioids, benzodiazepines
Additive CNS depressant effects. Alkaloids have demonstrated GABA-A modulation and possible opioid receptor activity. May prolong sedation or enhance respiratory depression.
Pregnancy
Contains alkaloids with potential opioid activity. No safety studies in pregnancy. Best avoided as a precaution.
MAO inhibitors (MAOIs)
Theoretical interaction - alkaloids may interact with MAO inhibition. Caution advised though not clinically documented.
Toxicity
Generally considered safe at 500 mg-2 g/day dried herb. No significant toxicity documented at therapeutic doses. Aqueous extracts non-toxic in mouse studies.
Drowsiness, impaired coordination at high doses. No reports of serious toxicity at therapeutic doses in adults.
Reduce dose. For severe sedation: standard supportive care. Not known to cause respiratory depression at therapeutic doses.
Adverse Effects
CYP Metabolism
Limited CYP data. Alkaloids may be substrates or inhibitors of CYP enzymes; clinical significance unknown. Use caution with narrow therapeutic index drugs.
swap_horiz Interactions
CNS Depressants / Sedatives (Benzodiazepines, Zolpidem, Barbiturates)
Class: CNS Depressants
California poppy alkaloids — including (S)-reticuline and protopine — modulate GABA-A receptors as positive allosteric modulators and may have partial opioid receptor agonist activity. Additive CNS depression with benzodiazepines, barbiturates, or non-benzodiazepine sedatives can result in excessive sedation or respiratory depression.
Avoid combining California poppy supplements with CNS depressant medications. If a patient insists on use, reduce CNS depressant doses cautiously and monitor for excessive sedation, respiratory depression, and impaired psychomotor function. Use with caution in elderly patients.
Opioid Analgesics (Morphine, Codeine, Oxycodone, Tramadol)
Class: Opioid Analgesics
California poppy alkaloid (S)-reticuline can be biotransformed to morphine-like alkaloids that bind mu-opioid receptors. Protopine's analgesic effects are partially reversible by naloxone, indicating opioid receptor interaction. Additive opioid receptor stimulation increases risk of excessive analgesia, sedation, and respiratory depression.
Do not combine California poppy with opioid medications without medical supervision. Advise patients on opioid therapy to avoid California poppy products. Monitor for signs of opioid toxicity (excessive sedation, respiratory rate <12/min, miosis). Naloxone may reverse effects.
CYP3A4 / CYP2C9 / CYP2C19 Substrates (Warfarin, Midazolam, Alprazolam, Tacrolimus)
Class: CYP-metabolized Drugs
Ethanolic extracts of California poppy and isolated alkaloids escholtzine and allocryptopine show strong time-dependent inhibition of CYP3A4, CYP2C9, and CYP2C19 in vitro, while protopine reversibly inhibits CYP2D6. This can reduce clearance of drugs metabolized by these enzymes, raising plasma levels.
Exercise caution when combining California poppy extracts (particularly ethanolic tinctures) with drugs having narrow therapeutic indices and CYP3A4/2C9/2C19 metabolism. Aqueous tea preparations appear to have lower CYP interaction risk. Monitor for signs of drug toxicity.
MAO Inhibitors (Phenelzine, Tranylcypromine, Selegiline, Moclobemide)
Class: MAO Inhibitors
California poppy alkaloids act on serotonin (5-HT1A) receptors, and N-methyllaurotetanine (NMT) has demonstrated antidepressant-like serotonergic activity. Combining with MAO inhibitors may increase serotonergic activity, raising theoretical risk of serotonin syndrome and hypertensive crisis.
Avoid combining California poppy with MAO inhibitors. Maintain a washout period of at least 14 days between MAO inhibitor treatment and California poppy use. Monitor for signs of serotonin syndrome (agitation, hyperthermia, tachycardia, myoclonus).
General Anesthetics / Perioperative Agents
Class: Anesthetic
California poppy's GABAergic alkaloids can potentiate the CNS depressant effects of anesthetic agents, potentially prolonging anesthesia induction, recovery time, or causing unexpected hypotension. The multi-receptor pharmacology of its alkaloids makes preoperative interactions particularly unpredictable.
Discontinue California poppy supplements at least 2 weeks before elective surgery. Inform anesthesiologist of any California poppy use. Monitor respiratory function closely during and after anesthesia in patients who have used this herb.
hub Combinations
Synergistic pairings can enhance therapeutic outcomes, while knowing suitable substitutes helps when specific herbs are unavailable or contraindicated.
Synergistic Combinations
3Hawthorn
Strong EvidenceThe validated clinical combination (with magnesium) demonstrated efficacy for anxiety. Hawthorn cardiovascular support complements California Poppy nervine effects for cardiac manifestations of anxiety.
RCT: Hanus M et al. Curr Med Res Opin. 2004;20(1):63-71. E. californica + Crataegus + magnesium for mild-moderate anxiety in 264 patients.
Passionflower
Limited EvidenceBoth are nervine sedatives acting on GABA pathways. California Poppy is more analgesic while Passionflower has stronger antispasmodic and anxiolytic activity. Combined for anxiety with pain or insomnia.
Traditional pairing in clinical herbalism; no direct RCT data for combination.
Valerian
Moderate EvidenceBoth herbs modulate GABA pathways with different alkaloid/valerenic acid mechanisms. Clinical trial showed combination reduced insomnia severity and increased sleep duration.
Open-label observational study: 36 patients with insomnia showed significant improvement in sleep duration (+0.5h) and insomnia severity with E. californica + valerian combination.
science Studies
Modulation of CYPs, P-gp, and PXR by Eschscholzia californica (California Poppy) and Its Alkaloids
In VitroThis in vitro pharmacokinetic study investigated the effects of Eschscholzia californica ethanol extract, aqueous extract, and isolated alkaloids on cytochrome P450 enzymes, P-glycoprotein, and the pregnane X receptor. The ethanol extract and its fractions showed potent time-dependent inhibition of CYP3A4, CYP2C9, and CYP2C19, plus reversible inhibition of CYP2D6. The isolated alkaloids escholtzine and allocryptopine were identified as the key CYP inhibitors. Notably, the aqueous tea extract and californidine did not significantly affect these drug-metabolizing pathways, suggesting that tea preparations may be safer than ethanol-based supplements regarding drug interactions.
Modulatory Effects of Eschscholzia californica Alkaloids on Recombinant GABAA Receptors
In VitroThis in vitro electrophysiology study investigated the molecular mechanisms underlying the sedative and anxiolytic effects of California poppy alkaloids using recombinant GABAA receptor isoforms expressed in Xenopus oocytes. The alkaloid (S)-reticuline was identified as a positive allosteric modulator at alpha3, alpha5, and alpha6 GABAA receptor isoforms, explaining the anxiolytic properties of the plant. N-methyllaurotetanine showed no significant effect at concentrations below 30 uM. The chloride-current modulation by (S)-reticuline at specific receptor subtypes provides a plausible molecular basis for California poppy's traditionally documented sedative and anxiolytic effects.
medication Dosing
tincture
30-60 drops (1.5-3 mL), 1:5 in 60% ethanol
1-3x/day; higher dose at bedtime for insomnia
Lower doses (30 drops) for daytime anxiolytic use; higher doses (60 drops) for sedation and sleep. Can be combined with valerian for insomnia.
capsule
500 mg-2 g dried aerial parts powder
1-2x/day; or as directed
Health Canada authorized product: 3 g dried herb standardized to 0.8% isoquinoline alkaloids as analgesic and mild sedative. Start with lower dose to assess individual sensitivity.
tea
1-2 tsp dried aerial parts per cup
1-3x/day
Steep covered 10-15 min. Mild pleasant flavor. Suitable for evening use. For children: half adult dose under herbal supervision.
Disclaimer: This information is largely AI-generated and reviewed by human experts at Evara Health. It is intended for educational and clinical reference purposes only and should not replace professional medical advice.
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