Drug & supplement interaction

Eggshell Membrane + Fesoterodine Fumarate

Fesoterodine Fumarate brand name: Toviaz.

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

We found no known interaction between Eggshell Membrane and Fesoterodine Fumarate 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.

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Interaction report

Eggshell Membrane and Fesoterodine Fumarate

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 Fesoterodine Fumarate and Eggshell Membrane 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 Eggshell Membrane at all — not against Fesoterodine Fumarate, 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.

Eggshell Membrane safety at a glance

Eggshell Membrane overall Use caution Generally well tolerated in short-term studies, but should be avoided by anyone with an egg allergy.
Pregnancy Avoid There is not enough safety information, so it is best to avoid use during pregnancy.
Breastfeeding Avoid Safety while breastfeeding has not been studied, so avoiding it is the safer choice.

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

Still wondering about combining Fesoterodine Fumarate and Eggshell Membrane? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

What Fesoterodine Fumarate’s Own FDA Label Lists

This is not an interaction — none of it involves Eggshell Membrane. These are the most notable effects listed in the ADVERSE REACTIONS section of Fesoterodine Fumarate’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. 9 of them are worth acting on rather than waiting out — marked below.

  • Trouble passing urine Worth acting on mentioned in 4.7% of FDA reports for Fesoterodine Fumarate
  • Pain or burning when passing urine Worth acting on
  • An irregular heartbeat Worth acting on
  • Confusion Worth acting on
  • Chest pain Worth acting on
  • A severe allergic reaction Worth acting on
  • Hives Worth acting on
  • A higher chance of infection Worth acting on
  • An allergic reaction Worth acting on
  • Dry eyes

Showing the 10 most notable of 29 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 Fesoterodine Fumarate. Read the label on DailyMed › Where a percentage is shown, it is the share of 10,773 voluntary FDA FAERS reports for Fesoterodine Fumarate that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Eggshell Membrane’s licensed record lists no adverse effects our clinical vocabulary could match, so there is no Eggshell Membrane side to compare — that is a limit of the record, not a statement that Eggshell Membrane has no side effects.

Everything else you take

See Every Supplement That Interacts With Fesoterodine Fumarate

This page covers Eggshell Membrane only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Fesoterodine Fumarate page lists 195 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: 1,4-butanediol (major), Activated Charcoal (major), Beer (major), Gamma-hydroxybutyrate (ghb) (major) and Grapefruit (major).

By severity: 9 major · 147 moderate · 39 minor.

From our pharmacist’s overview on the Fesoterodine Fumarate page

“Fesoterodine (Toviaz) calms an overactive bladder, and this list deserves genuine care, because nine of its 195 entries are rated major. Most of the supplements here change how your body clears the drug.”

Reviewed by 2 · Jul 18, 2026

Open the Fesoterodine Fumarate interaction page

How much people look this up

Where Eggshell Membrane and Fesoterodine Fumarate 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 Eggshell Membrane
Steady interest

#1,407 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Fesoterodine Fumarate
Steady interest

#2,747 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. Eggshell Membrane 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 Eggshell Membrane reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Eggshell Membrane and Fesoterodine Fumarate records this page draws on were last updated July 11, 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 Eggshell Membrane

What is Eggshell Membrane?

  • Joint pain and stiffness
  • Osteoarthritis
  • Joint flexibility and range of motion
  • Connective tissue support
  • Exercise-related joint discomfort

Eggshell membrane is a natural source of collagen, hyaluronic acid, and other connective-tissue compounds that is marketed mainly for joint comfort and osteoarthritis. Some small studies suggest it may modestly reduce joint pain and stiffness, but the evidence is limited and more research is needed. It is generally well tolerated, but people with egg allergy should avoid it.

The thin membrane lining the inside of a chicken (hen) eggshell · Capsules, tablets, powder

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

Eggshell Membrane: dosing

There is no official, standardized dose for eggshell membrane. Studies have used it as a once-daily supplement, and commercial products usually come in fixed capsule or tablet strengths.The best approach is to follow the directions on the product label and not take more than recommended.

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

Read the full Eggshell Membrane monograph & all interactions
Medication

About Fesoterodine

What Is Fesoterodine Used For?

Brand name: Toviaz

Fesoterodine extended-release tablets treat overactive bladder (OAB) in adults — specifically the symptoms of urgent, frequent urination and urge urinary incontinence (leaking urine when you feel a sudden, strong urge to go).

Toviaz (fesoterodine fumarate extended-release tablets) is also approved to treat neurogenic detrusor overactivity (NDO) — bladder muscle overactivity caused by a nerve or spinal condition — in children 6 years and older who weigh more than 25 kg (about 55 lbs).

Most-Reported Side Effects for Fesoterodine Fumarate

From FAERS, the FDA’s public side-effect reporting system (10,773 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Dry mouth 823 reports
Fall 534 reports
Fatigue 519 reports
Constipation 504 reports
Urinary retention 502 reports
See full Fesoterodine drug information
Keep checking

Other Drugs & Eggshell Membrane

Browse every other medication we’ve checked against Eggshell Membrane — 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 Eggshell Membrane 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 Eggshell Membrane list.

See the full Eggshell Membrane interactions page
See every supplement checked against Fesoterodine Fumarate, ranked by severity
Evidence & sources

Eggshell Membrane References

The 3 sources that drive our Eggshell Membrane monograph — publicly available pages from reputable medical and government organizations. Every link was verified to work before publishing. Eggshell Membrane is not covered by the licensed Natural Medicines interaction database, so its page cites these public sources directly.

  1. Osteoarthritis — MedlinePlus (NIH) Source
  2. Dietary Supplements: What You Need to Know — NIH Office of Dietary Supplements Source
  3. 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 Eggshell Membrane and Fesoterodine Fumarate Together: Common Questions

Is it safe to take Eggshell Membrane with Fesoterodine Fumarate?
We do not list a known interaction between Eggshell Membrane and Fesoterodine Fumarate. 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.
Does Fesoterodine Fumarate interact with any supplements?
Yes. Fesoterodine Fumarate has documented interactions with 195 supplements in our database — Eggshell Membrane is not one of them. The Fesoterodine Fumarate 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

Eggshell Membrane monograph Uses, safety profile, and every drug interaction in one place Fesoterodine drug information The full plain-English guide to this medication Fesoterodine Fumarate supplement interactions Every supplement checked against Fesoterodine Fumarate, 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 3 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Fesoterodine Fumarate and Eggshell Membrane?

Our pharmacists answer your medication & supplement questions — free.

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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.