🟡

Milk Thistle × PPIS

MODERATE INTERACTION

⚠️ Mechanism

Milk Thistle is a weak inhibitor of CYP3A4, which decreases metabolism of CYP3A4 substrates, potentially increasing their plasma concentrations and risk of adverse effects.

📋 Effect

Increased plasma levels of omeprazole (ppis), potentially leading to toxicity or enhanced adverse effects.

💊 Management

Monitor for increased adverse effects of omeprazole. Dose reduction may be necessary. Consider alternative supplement or consult healthcare provider.

Plain Language Summary

This combination carries a moderate risk because Milk Thistle can slow down how your body breaks down certain acid-reducing drugs. This may cause the medication to build up in your system, which could increase your risk of experiencing side effects.

Source

Flockhart CYP450 Table (drug-interactions.medicine.iu.edu)

Supporting Research

Evaluation of the effect of herbal agents as management of radiodermatitis in breast cancer patients: A systematic review and meta-analysis PMID:37816677 DOI:10.1111/jjns.12559 2024
Efficacy of different interventions for nonalcoholic fatty liver disease: A meta-analysis of lifestyle modifications, silymarin, and medications PMID:40738719 DOI:10.6133/apjcn.202508_34(4).0003 2025
Pharmacotherapy for trichotillomania PMID:34582562 DOI:10.1002/14651858.CD007662.pub3 2021
Efficacy of traditional Chinese medicine combined with Silibinin on nonalcoholic fatty liver disease: A meta-analysis and systematic review PMID:38306552 DOI:10.1097/MD.0000000000037052 2024
Are alterations needed in Silybum marianum (Silymarin) administration practices? A novel outlook and meta-analysis on randomized trials targeting liver injury PMID:40221681 DOI:10.1186/s12906-025-04886-y 2025
The therapeutic effects of silymarin for patients with glucose/lipid metabolic dysfunction: A meta-analysis PMID:33019400 DOI:10.1097/MD.0000000000022249 2020
The therapeutic effect of silymarin in the treatment of nonalcoholic fatty disease: A meta-analysis (PRISMA) of randomized control trials PMID:29245314 DOI:10.1097/MD.0000000000009061 2017
Prevention and management of idiosyncratic drug-induced liver injury: Systematic review and meta-analysis of randomised clinical trials PMID:33359912 DOI:10.1016/j.phrs.2020.105404 2021
Medical Disclaimer: This interaction record is for informational and educational purposes only and does not constitute medical advice. Drug-supplement interactions can be dangerous. Always consult your healthcare provider or pharmacist before combining any supplement with prescription medications. Do not stop or change any medication without professional guidance.