Red Yeast Rice and medications.
Red Yeast Rice is not in the Distil recommendation database. We surface it here deliberately, because why a compound is left out is as useful as what we recommend.
Red yeast rice is a statin sold as a supplement. It naturally contains monacolin K, which is the exact same molecule as the prescription statin lovastatin, and that single fact is why it sits outside the Distil database. Taken on top of a prescribed statin it is two statins at once, which raises the risk of muscle injury, including the serious form called rhabdomyolysis, with no added benefit. On its own it carries the same muscle and liver risks as any statin.
The bigger problem is that the monacolin content is unregulated and varies widely between products, so the statin dose you are actually taking is unknown. A medicine this consequential belongs under prescription with monitoring, not bought blind off a shelf. The documented pairs below are the statin-on-statin combinations to avoid. For lipids, the options below have a cleaner profile, though none replaces a statin where one is genuinely needed.
What to consider instead. Every option below is in the Distil database, so you can check each against your own medications:
- Bergamot Extract (BPF / Bergavit40): standardised bergamot has trial evidence for LDL and triglycerides
- Berberine: lowers LDL and fasting glucose; watch for additive effects with diabetes medicines
- Omega-3 EPA: mainly a triglyceride lever
We still hold the documented interactions for Red Yeast Rice, which is why it stays in the interactions checker even though we do not recommend it. Below are the 4 documented pairs we have explicitly assessed: 4 red. Every call is cited to a clinical reference (PMID) or the British National Formulary.
Documented interactions
Additive muscle toxicity
Red yeast rice is a statin. It naturally contains monacolin K, which is the same molecule as the prescription statin lovastatin. Taking it on top of atorvastatin means you are taking two statins at once, which may raise the risk of muscle damage, including a serious form called rhabdomyolysis. Do not combine the two without your GP's guidance.
Red yeast rice is a statin. It naturally contains monacolin K, the same molecule as the prescription statin lovastatin. Taking it alongside simvastatin means two statins at once. Simvastatin is one of the more muscle-prone statins, so the combination may raise the risk of muscle damage, including the serious form called rhabdomyolysis. Do not combine the two without your GP's guidance.
CYP3A4 inhibition
Red yeast rice is a statin in disguise. It naturally contains monacolin K, the same molecule as the prescription statin lovastatin, and that statin is cleared by a liver enzyme called CYP3A4. Clarithromycin strongly blocks that enzyme, so taking the two together can push the statin in red yeast rice to much higher levels than intended and raise the risk of muscle damage, including the serious form called rhabdomyolysis. Do not combine them. If you need clarithromycin, stop the red yeast rice for the course and speak to your GP or pharmacist.
Red yeast rice is a statin in disguise. It naturally contains monacolin K, the same molecule as the prescription statin lovastatin, and that statin is cleared by a liver enzyme called CYP3A4. Erythromycin blocks that enzyme, so taking the two together can push the statin in red yeast rice to much higher levels than intended and raise the risk of muscle damage, including the serious form called rhabdomyolysis. Do not combine them. If you need erythromycin, stop the red yeast rice for the course and speak to your GP or pharmacist.
What this page does not say. Leaving a compound out of our recommendations is not a verdict that it is useless for everyone. It is a statement about safety, evidence, or interaction load in the context Distil screens for. Discuss any supplement decision with whoever manages your prescriptions.
How we grade severity, choose what's in scope, and what we exclude.
Every call on this page is reasoned. We publish the full rubric for severity tiers, the medication inclusion logic, the evidence grades we accept, and what we deliberately leave out. About three thousand words. Worth reading once if you use this tool more than occasionally.
Read the full methodologyWant this reasoning across everything you take?
This page checks the pairs you enter. A personalised Distil report applies the same graded, cited reasoning to your whole stack: your goals, conditions, medications, diet, and the compounds worth adding or dropping. The interactions check is one section of it. You can read a real one in full before you decide.
See a real sample reportSomething missing?
If a supplement or medication you take isn't in our autocomplete, tell us. We go through what people flag every week and add what's missing.