Drug & supplement interaction

Heather + Mesalamine

Mesalamine brand names: Pentasa, Asacol, Canasa, Rowasa, Lialda, and others.

No Known Interaction
Medically reviewed by · Updated June 2026 · Pair last verified Sep 20, 2026
The bottom line No known interaction

We found no known interaction between Heather 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.

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Interaction report

Heather 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 Heather 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.

Worth understanding: our licensed dataset holds no drug-interaction record for Heather at all — not against Mesalamine, and not against any other medication we track. This verdict therefore rests on the absence of any recorded data, not on research that looked at this combination and found nothing. We cannot rule an interaction out.

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.

Heather safety at a glance

Heather overall Use caution Generally regarded as mild but human safety and effectiveness data are very limited.
Pregnancy Avoid Not enough safety information, so it is best avoided during pregnancy.
Breastfeeding Avoid No reliable safety data during breastfeeding, so avoid it.

Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

Still wondering about combining Mesalamine and Heather? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Mesalamine’s Own FDA Label Lists

This is not an interaction — none of it involves Heather. These are the most notable effects listed in the ADVERSE REACTIONS section of Mesalamine’s own FDA label, for the medication by itself. Knowing the drug’s own list makes it easier to work out the likely cause if something new turns up while you take both. 6 of them are worth acting on rather than waiting out — marked below.

  • Kidney stones Worth acting on
  • Kidney problems Worth acting on
  • Anemia Worth acting on
  • Liver problems Worth acting on
  • A higher chance of infection Worth acting on
  • An allergic reaction Worth acting on
  • Sun sensitivity
  • Bloating or gas
  • Stomach pain
  • Diarrhea

Showing the 10 most notable of 12 label-listed effects — ranked by how unusual each one is across medicines generally, with serious effects weighted up.

From the ADVERSE REACTIONS section of the FDA label for Mesalamine. Read the label on DailyMed › Heather’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Heather side to compare — that is a limit of the record, not a statement that Heather has no side effects.

How to take them

Some Mesalamine Products Have a Food Rule — Heather Should Not Break It

At least one FDA label for a product containing Mesalamine says to take it with food. If you take Heather 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.

From our Q&A

Questions About Heather 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 Heather 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.

Everything else you take

See Every Supplement That Interacts With Mesalamine

This page covers Heather 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

Open the Mesalamine interaction page

One more smart check

Taking Heather as Part of a Dietary Supplement Product? Check It for Interactions

We hold 40 real supplement products containing Heather, each one broken down to its full ingredient list — and combination products often carry several ingredients besides Heather. Even though Heather 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:

How much people look this up

Where Heather 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.

Supplement Heather
Steady interest

#895 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Mesalamine
Top half

#739 of 2,830 medications looked up here in the last 7 days

29 days ago today

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. Heather is not yet covered by that licensed database, so its write-up cites publicly available medical sources directly (see the references below).
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Heather reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Heather and Mesalamine records this page draws on were last updated June 22, 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.
Data structure & sourcing designed and verified by .
Supplement

About Heather

What is Heather?

  • Urinary tract complaints
  • Mild fluid retention
  • Joint and rheumatic discomfort
  • Sleep and relaxation
  • Skin and wound care (topical)

Heather (Calluna vulgaris) is a traditional European herb used mainly as a tea for urinary and minor inflammatory complaints, but high-quality human studies are lacking. It is generally considered gentle when used as a tea, though its effectiveness is largely unproven, so check with a pharmacist or doctor before relying on it.

Calluna vulgaris · Ericaceae · Flowering tops and aerial parts · Tea (dried flowers), tincture, liquid extract, capsules

An interaction check asks whether these two react with each other — it does not ask whether Heather is a good idea for someone in your situation. Here is what our Heather record says about it on its own.

Heather: dosing

There is no established standardized dose for heather. Traditional use is mostly as a tea made from the dried flowering tops, but exact amounts vary widely between products and sources.The safest approach is to follow the directions on the product label and not exceed them.

From our Heather monograph — the full record covers uses, side effects and every documented interaction.

Read the full Heather monograph & all interactions
Medication

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).

See full Mesalamine drug information
Keep checking

Other Drugs & Heather

Browse every other medication we’ve checked against Heather — both the ones with a known interaction and the ones without. Select any drug for the full detail.

0Major
0Moderate
0Minor
2,829No known interaction
2,829 No interaction
No interaction 2,829 drugs checked — show the list

We also checked Heather against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,829 medications checked with no known interaction — see the full Heather list.

See the full Heather interactions page
See every supplement checked against Mesalamine, ranked by severity
Evidence & sources

Heather References

The 2 sources that drive our Heather monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Heather is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Herbs and Supplements — MedlinePlus Source
  2. Using Dietary Supplements Wisely — NIH NCCIH Source

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.

Pharmacist Counseling Corner

Taking Heather and Mesalamine Together: Common Questions

Is it safe to take Heather with Mesalamine?
We do not list a known interaction between Heather and Mesalamine. That does not guarantee the combination is risk-free, so confirm with your pharmacist or doctor — especially if you take other medications or have a health condition.
Should I take Heather and Mesalamine at the same time of day?
At least one FDA label for a product containing Mesalamine says to take it with food. If you take Heather on an empty stomach out of habit, keep them separate and take Mesalamine with a meal where the label says to. Food instructions belong to the product rather than the ingredient — two Mesalamine products can differ — so check the directions on your own box. This is about absorption, not an interaction.
Does Mesalamine interact with any supplements?
Yes. Mesalamine has documented interactions with 17 supplements in our database — Heather is not one of them. The Mesalamine interaction page linked on this page lists every one, ranked by severity.

Written and reviewed by the HelloPharmacist editorial staff. Our editorial policy

Where next

Keep Exploring

Heather monograph Uses, safety profile, and every drug interaction in one place Mesalamine drug information The full plain-English guide to this medication Mesalamine supplement interactions Every supplement checked against Mesalamine, ranked by severity Supplement interaction checker Check any supplement or product against your medications Browse medications A–Z Every drug we’ve checked against herbs & supplements References The 2 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Mesalamine and Heather?

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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.