Cannabidiol (cbd) + Niacin, Simvastatin
Niacin, Simvastatin brand name: Simcor.
Niacin, Simvastatin falls into 2 drug categories that Cannabidiol (cbd) can interact with; the most serious is rated moderate. Cannabidiol may increase levels of drugs that are metabolized by CYP3A4.
Read the full interaction reportCannabidiol (cbd) and Niacin, Simvastatin
These two interact in 2 distinct ways. Each one is explained separately below.
Why Are There 2 Interactions?
Cannabidiol (cbd) interacts with whole categories of medication. Niacin, Simvastatin falls into 2 of those categories, so it can interact with Cannabidiol (cbd) in 2 different ways. We’ve listed each one below — your overall risk is driven by the most serious of them (Moderate).
CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES
1 of 2Why this applies to Niacin, Simvastatin
Niacin, Simvastatin falls under CYTOCHROME P450 3A4 (CYP3A4) SUBSTRATES — the group Cannabidiol (cbd) interacts with.
In vitro and animal research shows that cannabidiol inhibits CYP3A4. In human studies and case reports, cannabidiol has been associated with an increase in plasma levels of the CYP3A4 substrates zonisamide, tacrolimus, everolimus, citalopram, midazolam, and methadone.
Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports..
Here's the thing to know about your Simcor: the simvastatin part is cleared from your body mainly by a liver enzyme called CYP3A4. CBD appears to slow that enzyme down. When that happens, simvastatin can build up higher than expected, and that's the part worth watching.
Higher simvastatin levels can mean a bigger chance of muscle aches, soreness, or weakness, and rarely more serious muscle problems. The niacin in this combo can add its own muscle and liver concerns too. This is backed by solid human studies, so it's not just theory. Please don't change anything on your own. Just check with your pharmacist or doctor first, since they may want to watch for muscle symptoms or review your dose.
- Yamaori S, Ebisawa J, Okushima Y, et al. Potent inhibition of human cytochrome P450 3A isoforms by cannabidiol: role of phenolic hydroxyl groups in the resorcinol moiety. Life Sci 2011;88(15-16):730-6. PubMed
- Harvey DJ. Absorption, distribution, and biotransformation of the cannabinoids. Marijuana and Medicine. 1999;91-103. DOI
- Bornheim LM, Everhart ET, Li J, Correia MA. Characterization of cannabidiol-mediated cytochrome P450 inactivation. Biochem Pharmacol 1993;45(6):1323-31. PubMed
- Gaston TE, Bebin EM, Cutter GR, Liu Y, Szaflarski JP; UAB CBD Program. Interactions between cannabidiol and commonly used antiepileptic drugs. Epilepsia. 2017 Sep;58(9):1586-92. PubMed
- Leino AD, Emoto C, Fukuda T, Privitera M, Vinks AA, Alloway RR. Evidence of a clinically significant drug-drug interaction between cannabidiol and tacrolimus. Am J Transplant. 2019;19(10):2944-2948. PubMed
- Wiemer-Kruel A, Stiller B, Bast T. Cannabidiol Interacts Significantly with Everolimus-Report of a Patient with Tuberous Sclerosis Complex. Neuropediatrics. 2019. PubMed
- Madden K, Tanco K, Bruera E. Clinically Significant Drug-Drug Interaction Between Methadone and Cannabidiol. Pediatrics. 2020;e20193256. PubMed
- Anderson LL, Doohan PT, Oldfield L, et al. Citalopram and Cannabidiol: In Vitro and In Vivo Evidence of Pharmacokinetic Interactions Relevant to the Treatment of Anxiety Disorders in Young People. J Clin Psychopharmacol. 2021. PubMed
- Nasrin S, Watson CJW, Perez-Paramo YX, Lazarus P. Cannabinoid Metabolites as Inhibitors of Major Hepatic CYP450 Enzymes, with Implications for Cannabis-Drug Interactions. Drug Metab Dispos 2021;49(12):1070-1080. PubMed
- Treyer A, Reinhardt JK, Eigenmann DE, Oufir M, Hamburger M. Phytochemical comparison of medicinal cannabis extracts and study of their CYP-mediated interactions with coumarinic oral anticoagulants. Med Cannabis Cannabinoids. 2023;6(1):21-31. PubMed
- Bansal S, Zamarripa CA, Spindle TR, et al. Evaluation of Cytochrome P450-Mediated Cannabinoid-Drug Interactions in Healthy Adult Participants. Clin Pharmacol Ther 2023.
GLUCURONIDATED DRUGS
2 of 2Niacin, Simvastatin also falls under GLUCURONIDATED DRUGS.
In vitro research shows that cannabidiol inhibits uridine diphosphoglucuronosyl transferase (UGT) 1A9 and UGT2B7, enzymes responsible for glucuronidation. Theoretically, this could decrease the clearance and increase levels of glucuronidated drugs.
Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
Here's the situation with this combo pill (the niacin plus simvastatin combination). CBD has been shown in lab dish studies to slow down certain UGT enzymes, which are part of how your body packages up and clears out some medicines. With niacin, this clearing step matters, so in theory CBD could let niacin linger a bit longer than usual.
If that happened, you might notice more of niacin's usual quirks, like flushing, warmth, itching, or an upset stomach. I want to stress that this is theoretical and comes only from test-tube work, not from real people, so it may not pan out in everyday life. Still, since simvastatin already needs respect (think muscle aches), it's worth a quick chat with your pharmacist before pairing it with CBD.
- Epidiolex (cannabidiol) prescribing information. Greenwich Biosciences, Inc., Carlsbad, CA, 2019. Available at: https://www.epidiolex.com/sites/default/files/EPIDIOLEX_Full_Prescribing_Information.pdf (accessed 5/9/2019)
What These Ratings Mean
Every interaction above is graded three ways — here’s the key to each label.
Clinically significant. Avoid the combination, or use only under close professional supervision.
Usually worth avoiding or managing — may need monitoring, a dose change, or timing apart.
Generally not serious. Be aware of it and mention it to your pharmacist.
- LikelyWell-controlled human studies have demonstrated the likely existence of this interaction.
- ProbableInteraction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
- PossibleInteraction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists.
- UnlikelyInteraction has been demonstrated in animal or in lab research but has been shown not to occur in humans.
- AHigh-quality meta-analysis (quantitative systematic review).
- BCase-control study.
- CConsensus.
- DAnecdotal evidence.
These ratings are for information only. Never start, stop, or otherwise change your therapy before speaking with your provider.
Cannabidiol (cbd) Also Interacts With Other Medications
Cannabidiol (cbd) has 1,050 moderate known drug interactions in our database — the Niacin, Simvastatin one above is among them. If you take anything else, check it against the full list below.
Check Another of Your Medications Against Cannabidiol (cbd)
We haven’t checked that one against Cannabidiol (cbd) yet — ask our pharmacists directly.
Covers the 2,830 medications we’ve checked against Cannabidiol (cbd). Pick one to open its full report.
See Every Supplement That Interacts With Niacin, Simvastatin
This page covers Cannabidiol (cbd) only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Niacin, Simvastatin page lists 187 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Apple (major), Beer (major), Grapefruit (major) and Siberian Cocklebur (major).
By severity: 8 major · 140 moderate · 39 minor.
From our pharmacist’s overview on the Niacin, Simvastatin page
“Simcor combines niacin with simvastatin to lower cholesterol, and its interaction list deserves genuine care. Simvastatin is cleared by the CYP3A4 enzyme, and well over a hundred of these ingredients can push its blood level up or drag it down through that pathway.”
Reviewed by 2 · Jul 18, 2026
Where Cannabidiol (cbd) and Niacin, Simvastatin Sit Against Everything Else
Out of every supplement and medication people look up on HelloPharmacist, here is where these two land this week — and which way each has been moving.
#383 of 1,452 supplements looked up here in the last 7 days
#1,081 of 2,830 medications looked up here in the last 7 days
Position among everything looked up on this site, not a measure of how commonly either one is used or how important it is. A supplement can climb this list because of a news story. It counts every request to the page, automated ones included, and nothing here identifies anyone.
About Cannabidiol (cbd)
What is Cannabidiol (cbd)?
- Anxiety and stress
- Sleep problems
- Chronic pain
- Certain seizure disorders
- Inflammation
CBD is a compound from the cannabis (hemp) plant that does not cause a 'high.' It has strong evidence only for certain rare seizure disorders (as a prescription drug), while most other popular uses are still backed by limited or early research. Product quality varies a lot, so talk with your pharmacist or doctor before using it, especially if you take other medicines.
Other Drugs & Cannabidiol (cbd)
Browse every other medication we’ve checked against Cannabidiol (cbd) — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
1,050 interactions
- Diclofenac Sodium ›
- Diltiazem ›
- Theophylline ›
- Nifedipine ›
- Ibuprofen ›
- Metronidazole ›
- Diphenhydramine ›
- Hydrocortisone ›
- Naproxen ›
- Erythromycin ›
- Estradiol ›
- Propranolol ›
- Lidocaine ›
- Norethindrone ›
- Testosterone ›
- Verapamil ›
- Levonorgestrel ›
- Prednisone ›
- Quinidine ›
- Cyclosporine ›
- Dexamethasone ›
- Flurazepam ›
- Glyburide ›
- Triazolam ›
- Zopiclone ›
- Bupropion ›
- Ciprofloxacin ›
- Colchicine ›
- Fentanyl ›
- Flurbiprofen ›
- Isotretinoin ›
- Orphenadrine ›
- Oxybutynin ›
- Oxycodone ›
- Phenytoin ›
- Prednisolone ›
- Tacrolimus ›
- Temazepam ›
- Apomorphine ›
- Budesonide ›
- Carbamazepine ›
- Clindamycin ›
- Dextromethorphan ›
- Diclofenac Potassium ›
- Doxorubicin ›
- Fluticasone ›
- Formoterol ›
- Indomethacin ›
- Miconazole ›
- Morphine Sulfate ›
- Nitrazepam ›
- Trimipramine ›
- Acetaminophen ›
- Amphetamine ›
- Buprenorphine ›
- Conjugated Estrogens ›
- Diazepam ›
- Everolimus ›
- Griseofulvin ›
- Ivabradine ›
Showing 60 of 1,050 moderate interactions — see all 1,050 on the Cannabidiol (cbd) page.
No interaction 1,779 drugs checked — show the list
We also checked Cannabidiol (cbd) against these medications and found no known interaction in our sources. Open any page to confirm.
- Levothyroxine ›
- Methylphenidate ›
- Ivermectin ›
- Aspirin ›
- Rosuvastatin ›
- Docusate ›
- Hydroxyurea ›
- Valacyclovir ›
- Semaglutide ›
- Sumatriptan ›
- Tirzepatide ›
- Metformin ›
- Amoxicillin ›
- Lisinopril ›
- Acyclovir ›
- Methotrexate ›
- Doxycycline ›
- Azithromycin ›
- Methylene Blue ›
- Levothyroxine, Liothyronine ›
- Cyclopentolate ›
- Candesartan Cilexetil ›
- Mannitol ›
- Cephalexin ›
- Pegunigalsidase Alfa-iwxj ›
- Daptomycin ›
- Dexmethylphenidate ›
- Hexobarbitone ›
- Levothyroxine Sodium ›
- Spironolactone ›
- Factor 7a ›
- Thyroid Hormone ›
- Carbidopa, Levodopa ›
- Levodopa ›
- Mitomycin ›
- Minoxidil ›
- Lenvatinib ›
- Ezetimibe ›
- Cefaclor ›
- Hethylphenidate Hcl ›
- Phenylephrine ›
- Vancomycin ›
- Bentoquatam ›
- Tenecteplase ›
- Amoxicillin, Clavulanate Potassium ›
- Hydroxychloroquine ›
- Dirithromycin ›
- Triptorelin ›
- Pizotifen ›
- Procainamide ›
- Tocainide ›
- Azelaic Acid ›
- Acetylsalicylic Acid ›
- Dextrothyroxine ›
- Lomustine ›
- Rocuronium ›
- Hydrochlorothiazide ›
- Mitomycin C ›
- Hydrochlorothiazide, Lisinopril ›
- Dabigatran ›
Showing the 60 most looked-up of 1,779 medications checked with no known interaction — see the full Cannabidiol (cbd) list.
Sources & How We Checked
Interaction details are evidence-graded and sourced from the Natural Medicines database. The medication overview comes from MedlinePlus.
- Natural Medicines (Therapeutic Research Center) — Evidence-graded clinical reference for vitamins, herbs and supplements — the basis for our interaction data.
- MedlinePlus, U.S. National Library of Medicine — NIH consumer drug information, used for the medication overviews.
- NIH Dietary Supplement Label Database (DSLD) — Official supplement product labels.
Content is written and reviewed by licensed HelloPharmacist pharmacists. See our data sources and editorial standards for how this information is built and checked.
Parts of this content are provided by the Therapeutic Research Center, LLC.
DISCLAIMER: Currently this does not check for drug-drug interactions. This is not an all-inclusive comprehensive list of potential interactions and is for informational purposes only. Not all interactions are known or well-reported in the scientific literature, and new interactions are continually being reported. Input is needed from a qualified healthcare provider including a pharmacist before starting any therapy. Application of clinical judgment is necessary.
© 2021 Therapeutic Research Center, LLC
Niacin, Simvastatin Is Linked to Lower Levels of 3 Nutrients
Natural Medicines records Niacin, Simvastatin as a medicine that can lower these. This is not an interaction with Cannabidiol (cbd) — it is a separate effect of the medicine, and it is a reason some people are advised to supplement rather than to avoid one:
Read the full Niacin, Simvastatin nutrient depletion report ›
Depletion records come from the licensed Natural Medicines database. Do not start a supplement on the strength of this page — ask your pharmacist or doctor whether it applies to you.
Taking Cannabidiol (cbd) and Niacin, Simvastatin Together: Common Questions
Can you take Cannabidiol (cbd) with Niacin, Simvastatin?
Why are there 2 interactions listed for Cannabidiol (cbd) and Niacin, Simvastatin?
How serious is the Cannabidiol (cbd) and Niacin, Simvastatin interaction?
Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy
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This information is for education only and is not a substitute for professional medical advice. Always check with your pharmacist or doctor before starting, stopping, or combining supplements and medications.