The short answer
Green or black tea has not been shown to reduce codeine absorption or pain relief. A general claim about tea constituents is not enough to predict a clinically important interaction.
What this answer covers
Camellia sinensis brewed green/black tea versus concentrated extract; preparation and amount differ.
- Supplement or preparation
- Camellia sinensis
- Medication ingredient
- codeine
The codeine-specific evidence is limited
No inspected human study established reduced codeine exposure or analgesia from tea. National codeine guidance permits normal eating and drinking, while asking patients to disclose supplements.
Other drug interactions do not prove this one
Green-tea guidance describes interactions with some other medicines. Those findings cannot be assigned to codeine, which has different absorption and metabolic pathways.
A cup of tea and an extract differ
The botanical name does not identify catechin concentration, caffeine content or extraction method. An untested tea-binding theory does not establish a required separation interval for all products.
Review an unexpected change in effect
If pain relief changes, speak with the prescriber rather than increasing codeine. Mention concentrated tea products and all other medicines; the absence of direct interaction evidence does not guarantee every product is safe.
Evidence and practical considerations
Absorption & effectiveness
No exact codeine-tea exposure/efficacy evidence; other-drug tea interactions and constituent hypotheses cannot establish current claim. Routine dietary guidance does not guarantee extract safety.
- Exact scope
- Camellia sinensis brewed green/black tea versus concentrated extract; preparation and amount differ. with Codeine RxCUI2670 IN; current oral single-ingredient sulfate label, active morphine metabolism and formulation boundaries.
- Medication form and route
- oral medication; oral supplement
What remains uncertain
- No unmeasured pair incidence, blanket class transfer or arbitrary spacing interval.
Factors that may matter: Preparation; Dose; Other medicines; Organ function.
Read the supporting source summaries
Source 1: current product label
dailymed.nlm.nih.gov · Source check Sep 10, 2026
Population: People prescribed codeine
Codeine is converted to active morphine via CYP2D6. CYP2D6 inhibition can reduce morphine/effect despite increased codeine; CYP3A interactions complicate disposition. CNS-depressant combinations can cause serious sedation/respiratory depression.
How this applies: Exact codeine RxCUI 2670 IN, with stated salt/formulation/route bridge.
Not cough combination products or every salt formulation. No exact botanical risk rate; genotype, age and co-medications matter.
Source 2: federal supplement guidance
nccih.nih.gov · Source check Sep 10, 2026
Population: Users of green tea or extracts
Product composition differs; documented interactions cited for selected other drugs, not codeine.
How this applies: Preparation boundaries, not exact codeine interaction proof.
Cannot transfer nadolol or other-drug absorption effects to codeine. Green versus black tea and extract amounts differ.
Source 3: national patient medication guidance
nhs.uk · Source check Sep 10, 2026
Population: People prescribed codeine for pain
Normal eating/drinking permitted; advises informing clinicians about supplements and avoiding alcohol-related added effects.
How this applies: Medication-specific routine administration context.
General guidance, not a tea or black-walnut interaction study and not evidence every concentrated product is safe.
Research assessment: · Open full citations ↗
Review and change history
- Publication status
- Published research summary
- Clinical review
- Not yet recorded
| Date | Update |
|---|---|
| Article prepared | |
| Prepared exact codeine article with formulation-specific evidence and uncertainty. | |
| Research summary published |
Article revision: 9267eb761db0fcc4
This guide brings together the evidence records used by our interaction checker. Each finding retains its own preparation limits, research date, and source summaries.
Full citations require verification. Reading this answer and the source summaries does not.
Taking other supplements or medications?
Use the checker to explore your other combinations. Ask a pharmacist to review the exact products, amounts and medical conditions in your complete list.
Open the interaction checkerInformation, not medical advice. Do not change prescribed treatment based on this guide.