CBDA Stats & Data
WVOLTBSCXRRQFR-DLBZAZTESA-NMeasured Affinities
Guide to PHARMACOLOGYMeasured binding and functional data for cannabidiolic acid, curated by the IUPHAR/BPS Guide to PHARMACOLOGY. Each row cites the paper it came from. Lower concentrations mean tighter binding — a value in the sub-nanomolar range indicates a very potent interaction.
| Target | Action | Measure | Value | Concentration | Species | Source |
|---|---|---|---|---|---|---|
| TRPA1 Trpa1 | Agonist | pEC50 | 4.92 | 12,023 nM | Rat | PMID 20356305 |
Reading this. pKi, pEC50 and pIC50 are negative log molar values, so a higher number means a tighter interaction; the concentration column converts them for you. Values from non-human species are laboratory measurements and do not translate directly to human effect. Receptor affinity is not a dose — it describes what a molecule binds, not how much of it is safe to take.
Receptor data from the IUPHAR/BPS Guide to PHARMACOLOGY (v2026.2), licensed CC BY-SA 4.0. Matched to this substance by InChIKey.
Tolerance & Pharmacokinetics
drugs.wikiTolerance Decay
No controlled data. Repeated daily use appears to show minimal escalation needs anecdotally; any tolerance seems to be modest and reverses within 2–4 weeks off use.
Cross-Tolerances
Harm Reduction
drugs.wikiRationale 1 – Mechanism and potency vs CBD: Preclinical studies show CBDA suppresses nausea/vomiting and enhances 5‑HT1A receptor activation at doses orders of magnitude lower than CBD; this supports starting with lower doses and anticipating stronger anti‑nausea/anxiolytic effects at small amounts. This also implies additive effects with other 5‑HT1A agents. Rationale 2 – Decarboxylation and preservation: CBDA is the acidic precursor to CBD and decarboxylates upon heating; avoid smoking/vaping or heating tinctures if the intent is to ingest CBDA specifically. Erowid’s cannabis constituents list and cannabinoid chemistry references support that acidic cannabinoids convert to neutral forms with heat/light/time. Store cool, sealed, and away from light to reduce conversion. Rationale 3 – Product verification: Drug checking programs report mislabeling/adulteration of ‘CBD’ oils with potent semi‑synthetic cannabinoids (e.g., Δ9‑THCP) and other add-ins; insist on a recent third‑party COA that quantifies CBDA/CBD and THC and screens for novel cannabinoids. This reduces risk of unexpected intoxication or positive drug tests. Rationale 4 – Anticoagulants: Multiple case reports show CBD raises INR and necessitates warfarin dose reductions; while CBDA‑specific clinical data are sparse, caution is warranted and INR monitoring advised when initiating or changing CBDA due to possible overlapping CYP pathways. Rationale 5 – Benzodiazepines (clobazam): CBD markedly increases active metabolite N‑desmethylclobazam (via CYP2C19 inhibition), increasing sedation; CBDA’s direct effect here is not established but prudence dictates monitoring and starting low if co‑used. Rationale 6 – Psychedelics: Activation of 5‑HT1A receptors can attenuate certain 5‑HT2A‑mediated psychedelic effects in humans (e.g., buspirone blunting psilocybin visuals). CBDA’s 5‑HT1A activity therefore may modestly dampen some psychedelic phenomenology; keep expectations realistic. Rationale 7 – Stability/formulations: A stabilized analogue (CBDA methyl ester, EPM301) was developed because native CBDA is labile; this underscores the need to minimize heat and prolonged storage if retaining CBDA is desired. Additional HR tips: - Start low (e.g., 2–5 mg oral or 1–2 mg sublingual) and titrate by 2–5 mg steps. - Take with a small amount of dietary fat if oral (may aid absorption, as with other cannabinoids). - Space from sedatives by several hours; avoid combining first doses. - If on interacting meds (warfarin, clobazam, narrow TI drugs), involve a clinician and add monitoring (e.g., INR or drug levels) during the first 2–3 weeks after any CBDA change. - Use products with batch COAs; avoid heating CBDA products (baking/vaping) unless conversion to CBD is intended.
References
Cited references
- Bolognini D., Rock E.M., et al. Cannabidiolic acid prevents vomiting in shrews and nausea-induced behaviour in rats by enhancing 5‑HT1A receptor activation (Br J Pharmacol, 2013)
- Rock E.M., et al. Effect of low doses of CBDA and ondansetron on LiCl-induced conditioned gaping in rats (Br J Pharmacol, 2013)
- Pertwee/Mechoulam group – acidic cannabinoids and decarboxylation overview (Selected Topics in the Chemistry of Natural Products)
- PubChem – Cannabidiolic acid compound entry
- Geffrey A.L., et al. Drug–drug interaction between clobazam and cannabidiol in children with refractory epilepsy (Epilepsia, 2015)
- Grayson L., et al. An interaction between warfarin and cannabidiol, a case report (2017)
- SaferParty Zürich – CBD oil adulterated with Δ9‑THCP (product warning, 2025‑06‑25)
- Buspirone blunts psilocybin (5‑HT1A mediation) context via discussion and literature links
- CBDA methyl ester (EPM301) shows 5‑HT1A‑mediated anti‑nausea/anxiolysis in rats (2017)