Kratom and Clindamycin: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 1, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Kratom
No brand names on recordClindamycin
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Here's what's going on. Your body uses a liver enzyme called CYP3A to help break down clindamycin, the antibiotic. Kratom appears to slow that enzyme down. So when you take both, clindamycin may not clear as fast and can build up a bit higher in your body than usual. That can mean stronger effects, and possibly more side effects like stomach upset or diarrhea.
This is more likely with higher kratom doses or regular, daily use. The good news is this is manageable. Keep taking your antibiotic as prescribed and let your pharmacist or doctor know you use kratom so they can keep an eye on how you feel.
Mechanism: Kratom inhibits CYP3A-mediated metabolism. Clindamycin is a CYP3A substrate, so concomitant use may increase clindamycin exposure (AUC/Cmax). Neither drug's effect direction is complicated by prodrug activation here; this raises parent-drug exposure and effect.
- Direction: increased clindamycin exposure and effect
- Magnitude: not quantified; greater with higher kratom doses or chronic use
- Onset: unspecified
- Evidence: probable
Management: Monitor for enhanced clindamycin effect and adverse effects (GI intolerance, diarrhea, risk of C. difficile). Dose may need individualization by the care team. Reassess if kratom dose or frequency changes.
What happens
Increased CYP3A substrate exposure
Interaction Deep Dive
Taking kratom (a CYP3A inhibitor) together with a CYP3A substrate can raise the exposure of that CYP3A substrate, particularly when kratom is used at higher doses or over the long term1. Careful monitoring is recommended2.
Why it happens (mechanism)
Inhibition of CYP3A-mediated metabolism by kratom
How to manage this interaction
How your care team can handle this:
- Keep taking clindamycin exactly as prescribed. Do not stop or change the dose on your own.
- Tell your pharmacist and prescriber that you use kratom, including how much and how often, since higher or daily use matters more.
- Your team may monitor you more closely and, if needed, the clindamycin dose can be adjusted and individualized for you.
- Watch for and report stronger side effects, especially stomach upset or diarrhea.
This is a manageable interaction once your team knows about it.
Management is individual — confirm any change with your pharmacist or prescriber.
Literature reports
1 report — tap to read
a) An open-label crossover study in healthy adults (N=12) assessed intake of a single, low dose of kratom tea (2 g) alongside oral midazolam (a CYP3A probe substrate; 2.5 mg) and oral dextromethorphan (a CYP2D6 probe substrate; 30 mg). Kratom produced a modest rise in midazolam geometric mean AUC (1.39; 90% CI, 1.23 to 1.57) and Cmax (1.5; 90% CI, 1.32 to 1.7); dextromethorphan AUC and Cmax were not affected. The half life of midazolam was not significantly changed with concurrent kratom, which points to inhibition of first-pass metabolism, chiefly intestinal CYP3A. The participants (median age, 30 years) had prior kratom exposure and agreed to refrain from concomitant medications and botanical or other natural products (including kratom) for the duration of the study 1.
Common questions
Can I take Kratom and Clindamycin together?
Kratom can slow how you clear the antibiotic clindamycin, raising its levels and the chance of side effects like diarrhea, especially with high or daily kratom use. Keep taking your antibiotic and tell your pharmacist or doctor about your kratom use so they can monitor you. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Kratom and Clindamycin interaction?
It is rated moderate. Can be significant — usually manageable with monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Kratom and Clindamycin interaction managed?
How your care team can handle this: Keep taking clindamycin exactly as prescribed. Do not stop or change the dose on your own. Tell your pharmacist and prescriber that you use kratom, including how much and how often, since higher or daily use matters more. Your team may monitor you more closely and, if needed, the clindamycin dose can be adjusted and individualized for you. Watch for and report s… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "probable". Good supporting evidence, though not definitively proven.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Kratom or Clindamycin need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there anything you'd monitor while I'm on both?
References (2)
- Tanna RS, Nguyen JT, Hadi DL, et al: Clinical assessment of the drug interaction potential of the psychotropic natural product kratom. Clin Pharmacol Ther 2023; 113(6):1315-1325. PubMed
- Dhoble LR, Gour A, McCurdy CR, et al: Evaluating the drug interactions in kratom usage: clinical application. Expert Opin Drug Metab Toxicol 2025; 21(8):949-959. PubMed
Keep reading about Kratom
Keep reading about Clindamycin
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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