Red yeast rice products with monacolin K can behave like lovastatin. Combining them with a prescription statin can increase muscle, kidney, and liver risk, and products may also interact with medicines handled by CYP3A4 or P-glycoprotein.

Use with caution. Healthcare professional review recommended before use.

Contraindications

Pregnancy or breastfeeding
Active liver disease, prior statin intolerance, or unexplained muscle symptoms
Concurrent prescription statin use without professional supervision

Cautions

Modern red yeast rice products can behave like low-dose statin exposure, and potency varies widely across brands and batches.
Some commercial preparations may also contain citrinin or other fermentation byproducts, so supplement quality matters more here than with ordinary culinary red rice.
Traditional Hong Qu as a medicinal fermented grain should not be assumed equivalent to standardized or non-standardized capsule products.

Drug Interactions

Drug Class / Substrate	Mechanism	Severity	Source
Prescription statins	Monacolin K is chemically identical to lovastatin, so combined exposure can increase muscle, kidney, and liver adverse effects.	Major	NCCIH Red Yeast Rice
CYP3A4 and P-glycoprotein substrate medicines	Preclinical studies show red yeast rice extracts can inhibit CYP3A4 and P-glycoprotein and may alter drug exposure. Clinical relevance is not known.	Uncertain	Memorial Sloan Kettering About Herbs
Other medicines with statin-like muscle or liver toxicity	NCCIH notes that red yeast rice can share the same interaction types as statin drugs, which may increase adverse-effect risk.	Major	NCCIH Red Yeast Rice

Pregnancy

Not recommended during pregnancy. Consult a qualified healthcare provider before any use.

This information is for educational purposes only and does not constitute medical advice. Always consult a qualified healthcare provider before using herbal medicines, especially if you take prescription medications.