Boldo + Mesalamine
Mesalamine brand names: Pentasa, Asacol, Canasa, Rowasa, Lialda, and others.
We found no known interaction between Boldo and Mesalamine in our sources. Absence of a documented interaction is not the same as proven safety, and does not guarantee one does not exist. Do not start, stop, or change a medication or supplement based on this page; confirm with your pharmacist or doctor first. Additionally, although there is no interaction, the label for Mesalamine states a food rule worth keeping to, and the two are separately associated with some of the same side effects, which would make a new symptom harder to attribute to one or the other.
Boldo and Mesalamine
We checked these two against our interaction database. Here is what we found.
No Known Interaction Found
We did not find a documented interaction between Mesalamine and Boldo in our sources. This does not guarantee that the combination is completely free of risk — there is often limited research on supplements and herbal products, especially around drug interactions.
If you decide to take both, the practical routine is simple: add one new thing at a time and note the date you started it. If the combination is going to disagree with you, it usually shows in the first days to a couple of weeks — and a start date turns “I’ve been feeling off” into something a pharmacist can actually work with. Do not stop a prescribed medicine on your own.
Always talk with your pharmacist or doctor before making changes to your medications or supplements, particularly if you take several medications or have an ongoing health condition.
Boldo safety at a glance
Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center) — the full detail is in the Special populations card below. Safety guidance is general; always confirm with your pharmacist or doctor for your situation.
Why No Interaction Is Listed for Mesalamine
Interactions in our licensed database are recorded against drug classes, not just single drug names. Mesalamine is filed under a single classification — oral drugs. Boldo has documented interactions with 5 drug classes — the most serious being anticoagulant/antiplatelet drugs (moderate), hepatotoxic drugs (moderate) and lithium (moderate) — and none of Mesalamine’s classifications are among them.
Classification data comes from our licensed Natural Medicines dataset. A medication can belong to classes beyond those recorded there, so this describes how the check was run — it is not a safety guarantee.
Boldo Does Interact With Other Medications
Boldo has 482 moderate known drug interactions in our database — Mesalamine isn’t one of them. If you take anything else, check it against the full list below.
Check Another of Your Medications Against Boldo
We haven’t checked that one against Boldo yet — ask our pharmacists directly.
Covers the 2,830 medications we’ve checked against Boldo. Pick one to open its full report.
Boldo in Pregnancy & Breastfeeding
When used orally in medicinal amounts. In animals, boldo and the constituent boldine have abortive and teratogenic effects. Also, the ascaridole constituent of boldo is a liver toxin.
DISCLAIMER: This tool is intended for informational purposes only, and should not be interpreted as specific medical advice. Patients should consult with a qualified healthcare provider before making decisions about therapies and/or health conditions.© 2026 Therapeutic Research Center
Some Mesalamine Products Have a Food Rule — Boldo Should Not Break It
At least one FDA label for a product containing Mesalamine says to take it with food. If you take Boldo on an empty stomach out of habit, keep them separate — and take Mesalamine with a meal where the label says to.
This may not be true of your version. Food instructions belong to the product, not the ingredient: two Mesalamine products can carry different directions, and extended-release forms often differ from immediate-release ones. The label we read is quoted below — check the directions on your own box or bottle, or ask your pharmacist, for how to take the exact product you were given.
( 2 ) Administer mesalamine delayed-release tablets with food.
From the Dosage and Administration section of the FDA label we read for Mesalamine — where that label names a specific product, the instruction is that product's. Read the label on DailyMed ›
A food rule is not an interaction — it is about how much of the medicine you absorb. The directions that came with your own product, and your pharmacist, outrank anything on this page.
Questions About Boldo or Mesalamine
These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Boldo or Mesalamine, not necessarily both, but if one is close to what you were about to ask it will usually go further than a database entry can:
Not quite your question? Ask our pharmacists directly — it is free, there is no account required, and answers usually come back within 24 hours.
See Every Supplement That Interacts With Mesalamine
This page covers Boldo only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Mesalamine page lists 17 supplements it has a documented interaction with, worst first, each one explained.
The most serious there right now: Activated Charcoal (major), Coffee Charcoal (moderate), European Mandrake (moderate), Glucomannan (moderate) and Guar Gum (moderate).
By severity: 1 major · 7 moderate · 9 minor.
From our pharmacist’s overview on the Mesalamine page
“Activated charcoal is the one entry here I would treat as a genuine problem for anyone taking mesalamine (Asacol, Lialda, Pentasa, and others). It is the lone major-rated interaction among the 17 on file, because charcoal soaks up drugs in the gut and can pull mesalamine out of the picture before it does its job.”
Reviewed by 2 · Jul 18, 2026
Taking Boldo as Part of a Dietary Supplement Product? Check It for Interactions
We hold 173 real supplement products containing Boldo, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Boldo. Even though Boldo itself has no known interaction with Mesalamine, another ingredient on your label might. Find your product and we’ll check every ingredient on its label:
Where Boldo and Mesalamine 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.
#431 of 1,452 supplements looked up here in the last 7 days
#453 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.
Where does our data come from?
- Source: the Natural Medicines (TRC Healthcare) clinical database — the evidence-graded professional reference for herb & supplement interactions.
- Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Boldo reference on this page ↓
- Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Boldo and Mesalamine records this page draws on were last updated July 10, 2026.
- What “no known interaction” means: no documented interaction in the sources above — not a guarantee of safety. Supplements are studied far less than prescription drugs, so we say exactly what the evidence supports, and nothing more.
About Boldo
What is Boldo?
- Indigestion and bloating
- Mild constipation
- Liver and gallbladder support
- Appetite stimulation
- Urinary complaints
Boldo is a South American shrub whose leaves are traditionally used for digestive and gallbladder complaints, but good human evidence is very limited. The leaves and oil contain ascaridole, which can be toxic to the liver, so only ascaridole-free products should be used and only for short periods. Talk to your pharmacist or doctor before trying it, and avoid it during pregnancy and breastfeeding.
Peumus boldus · Monimiaceae · Leaves and essential oil · Tea, dried leaf, tincture, capsules, essential oil
An interaction check asks whether these two react with each other — it does not ask whether Boldo is a good idea for someone in your situation. Here is what our Boldo record says about it on its own.
Boldo: dosing
There is no well-established standardized dose for boldo, and products vary widely in strength and in how much ascaridole they contain. Because of this, it is best to follow the directions on the product label and use it only for short periods.Choose products labeled as ascaridole-free when possible, and avoid the pure essential oil.
From our Boldo monograph — the full record covers uses, side effects and every documented interaction.
About Mesalamine
What Is Mesalamine Used For?
Brand names: Pentasa, Asacol, Canasa, Rowasa, Lialda, Delzicol
Mesalamine is used to treat mildly to moderately active ulcerative colitis — a condition where the lining of the large intestine becomes inflamed and ulcerated. Depending on the product and formulation, it can be used to bring the disease under control (induction of remission) and/or to keep it from coming back (maintenance of remission).
Different products target different parts of the lower digestive tract. Oral forms (tablets and capsules) treat the colon more broadly. Rectal forms — including enemas (ROWASA, sfROWASA, mesalamine rectal suspension) — are used for distal ulcerative colitis, proctosigmoiditis, or proctitis (inflammation limited to the lower end of the colon or rectum). Rectal suppositories (CANASA, mesalamine rectal suppositories) are specifically for ulcerative proctitis (inflammation of the rectum only).
Other Drugs & Boldo
Browse every other medication we’ve checked against Boldo — both the ones with a known interaction and the ones without. Select any drug for the full detail.
No drugs match “”.
482 interactions
- Diclofenac Sodium ›
- Nifedipine ›
- Ibuprofen ›
- Aspirin ›
- Naproxen ›
- Doxycycline ›
- Minocycline ›
- Tetracycline ›
- Amoxicillin ›
- Testosterone ›
- Verapamil ›
- Fenofibrate ›
- Levonorgestrel ›
- Quinidine ›
- Cyclosporine ›
- Glyburide ›
- Methyltestosterone ›
- Ciprofloxacin ›
- Phenytoin ›
- Tacrolimus ›
- Allopurinol ›
- Carbamazepine ›
- Diclofenac Potassium ›
- Dipyridamole ›
- Acetaminophen ›
- Ketoprofen ›
- Methotrexate ›
- Nitrofurantoin ›
- Ofloxacin ›
- Propoxyphene ›
- Rifampin ›
- Testosterone Undecanoate ›
- Acarbose ›
- Bivalirudin ›
- Dapsone ›
- Doxycycline Hyclate ›
- Duloxetine ›
- Eltrombopag ›
- Interferon Alfa-2b ›
- Interferon Beta-1b ›
- Isoniazid ›
- Itraconazole ›
- Levofloxacin ›
- Naltrexone ›
- Riluzole ›
- Valproic Acid ›
- Warfarin Sodium ›
- Abiraterone Acetate ›
- Acebutolol ›
- Ambrisentan ›
- Amiodarone ›
- Azathioprine ›
- Bromfenac Sodium ›
- Chlorpropamide ›
- Choline Magnesium Trisalicylate ›
- Cyclophosphamide ›
- Dabigatran ›
- Daclizumab ›
- Dantrolene ›
- Deferasirox ›
Showing 60 of 482 moderate interactions — see all 482 on the Boldo page.
No interaction 2,347 drugs checked — show the list
We also checked Boldo against these medications and found no known interaction in our sources. Open any page to confirm.
- Levothyroxine ›
- Amlodipine ›
- Methylphenidate ›
- Sertraline ›
- Losartan Potassium ›
- Ivermectin ›
- Abemaciclib ›
- Metoprolol ›
- Escitalopram ›
- Tadalafil ›
- Docusate ›
- Tirzepatide ›
- Methamphetamine ›
- Hydroxyurea ›
- Valacyclovir ›
- Sumatriptan ›
- Semaglutide ›
- Prednisone ›
- Lisdexamfetamine ›
- Propranolol ›
- Metformin ›
- Amitriptyline ›
- Lisinopril ›
- Isotretinoin ›
- Amlodipine Besylate ›
- Bendamustine ›
- Bupropion ›
- Amphetamine ›
- Fluoxetine ›
- Acyclovir ›
- Azithromycin ›
- Lamotrigine ›
- Pregabalin ›
- Dextroamphetamine ›
- Gabapentin ›
- Quetiapine ›
- Clonazepam ›
- Levothyroxine, Liothyronine ›
- Omeprazole ›
- Letrozole ›
- Methylene Blue ›
- Buspirone ›
- Citalopram ›
- Bisoprolol ›
- Candesartan Cilexetil ›
- Diazepam ›
- Acetaminophen, Dextromethorphan, Doxylamine ›
- Cyclopentolate ›
- Cephalexin ›
- Mannitol ›
- Roxithromycin ›
- Levetiracetam ›
- Ezetimibe ›
- Spironolactone ›
- Phentermine, Topiramate ›
- Mirtazapine ›
- Dexmethylphenidate ›
- Amlodipine Besylate, Benazepril ›
- Levothyroxine Sodium ›
- Finasteride ›
Showing the 60 most looked-up of 2,347 medications checked with no known interaction — see the full Boldo list.
Boldo References
The 10 references that drive our Boldo monograph and interaction data, from the evidence-graded Natural Medicines (TRC Healthcare) database. Citations with a link open the study on PubMed or the publisher’s site.
- Newall CA, Anderson LA, Philpson JD. Herbal Medicine: A Guide for Healthcare Professionals. London, UK: The Pharmaceutical Press, 1996.
- Lambert J, Cormier J. Potential interaction between warfarin and boldo-fenugreek. Pharmacotherapy 2001;21:509-12. PubMed
- Piscaglia F, Leoni S, Venturi A, et al. Caution in the use of boldo in herbal laxatives: a case of hepatotoxicity. Scand J Gastroenterol 2005;40:236-9. PubMed
- Agarwal SC, Crook JR, Pepper CB. Herbal remedies -- how safe are they? A case report of polymorphic ventricular tachycardia/ventricular fibrillation induced by herbal medication used for obesity. Int J Cardiol 2006;106:260-1. PubMed
- Teng, C. M., Hsueh, C. M., Chang, Y. L., Ko, F. N., Lee, S. S., and Liu, K. C. Antiplatelet effects of some aporphine and phenanthrene alkaloids in rabbits and man. J Pharm Pharmacol 1997;49(7):706-711. PubMed
- Carbajal R, Yisfalem A, Pradhan N, et al. Case report: Boldo (Peumus boldus) and tacrolimus interaction in a renal transplant patient. Transplant Proc 2014;46(7):2400-2. PubMed
- Almeida ER, Melo AM, Xavier H. Toxicological evaluation of the hydro-alcohol extract of the dry leaves of Peumus boldus and boldine in rats. Phytother Res 2000;14(2):99-102. DOI
- Ribeiro RJ, Silvestre C, Duarte C. Hidden risks of alternative medicines: a case of boldo-induced hepatotoxicity. J Diet Suppl 2017;14(2):186-90. PubMed
- Oliveira Sá A, Pimentel T, Oliveira N. Boldo-Induced Hepatotoxicity: A Case of Unexplained Jaundice. Eur J Case Rep Intern Med 2020;7(12):002116. PubMed
- Valdes R, Feuereisen A, Bellinghausen M. Allergic Contact Dermatitis to Boldo. Dermatitis 2021;32(2):e31-e32. PubMed
Medication overviews come from MedlinePlus (NIH); supplement label data from the NIH Dietary Supplement Label Database. Content is written and reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.
Taking Boldo and Mesalamine Together: Common Questions
Is it safe to take Boldo with Mesalamine?
Do Boldo and Mesalamine have any of the same side effects?
Should I take Boldo and Mesalamine at the same time of day?
How was the Boldo and Mesalamine combination checked?
Does Boldo interact with any other medications?
Does Mesalamine interact with any supplements?
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.