Drug & supplement interaction

Shellac + Acetaminophen, Butalbital, Caffeine

Acetaminophen, Butalbital, Caffeine brand names: Tecnal, Esgic Plus, Fiogesic, Triad, Repan, and others.

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 Shellac and Acetaminophen, Butalbital, Caffeine 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 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.

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Interaction report

Shellac and Acetaminophen, Butalbital, Caffeine

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 Acetaminophen, Butalbital, Caffeine and Shellac 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 Shellac at all — not against Acetaminophen, Butalbital, Caffeine, 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.

Shellac safety at a glance

Shellac overall Use caution Generally regarded as safe as a coating in small amounts, but it is insect-derived and rare reactions can occur.
Pregnancy Use caution Likely fine in the tiny amounts used as a coating, but there is little specific safety data, so check with your doctor.
Breastfeeding Use caution Little specific data exists; the small amounts in coatings are unlikely to be a concern but caution is wise.

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

Still wondering about combining Acetaminophen, Butalbital, Caffeine and Shellac? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
What to actually watch for

No Interaction Found — But Data Suggests Shellac and Acetaminophen, Butalbital, Caffeine May Share a Side Effect

This is not an interaction. Neither one changes how your body handles the other, and nothing here says they react together. What our sources do show is that each has separately been linked to the effects below — so taking both can make those effects more likely to turn up, and harder to pin on one or the other if they do.

  • A skin rash Additional detail

    Shellac

    “Topically, there are numerous reports of allergic contact dermatitis and allergic contact cheilitis associated with shellac. Most cases of allergic dermatitis are related to shellac in mascara, especially Maybelline Great Lash mascara. However, cases of allergic contact dermatitis associated with shellac in tattoo ink and shellac in hair spray have been reported.”

    Shellac · Natural Medicines adverse-effect record, reported in dermatitis.

    6 sources cited
    1. 104260. González-Villanueva I, Hispn Ocete P, Silvestre Salvador JF. Allergic contact dermatitis caused by a black tattoo ink in a patient allergic to shellac. Contact Dermatitis. 2016;75(4):247-8. PubMed
    2. 104262. Shaw T, Oostman H, Rainey D, Storrs F. A rare eyelid dermatitis allergen: shellac in a popular mascara. Dermatitis. 2009;20(6):341-5. DOI
    3. 104263. Gallo R, Marro I, Pavesi A. Allergic contact dermatitis from shellac in mascara. Contact Dermatitis. 2005;53(4):238. PubMed
    4. 104264. Strauss RM, Orton DI. Allergic contact cheilitis in the United Kingdom: a retrospective study. Am J Contact Dermat. 2003;14(2):75-7. DOI
    5. 104265. Orton DI, Salim A, Shaw S. Allergic contact cheilitis due to shellac. Contact Dermatitis. 2001;44(4):250. PubMed
    6. 112297. Navarro-Triviño FJ. Allergic contact dermatitis from shellac in an ecological hair spray occurring in a patient with frontal fibrosing alopecia. Contact Dermatitis 2022;86(6):544-545. PubMed

    Acetaminophen, Butalbital, Caffeine

    Listed in the ADVERSE REACTIONS section of the FDA label for Acetaminophen, Butalbital, Caffeine. Read the label on DailyMed ›

Effects for Acetaminophen, Butalbital, Caffeine come from the ADVERSE REACTIONS section of its FDA label; effects for Shellac come from the Natural Medicines adverse-effect record, quoted above. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Everything else you take

See Every Supplement That Interacts With Acetaminophen, Butalbital, Caffeine

This page covers Shellac only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Acetaminophen, Butalbital, Caffeine page lists 252 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Asarabacca (major), Beer (major), Ephedra (major) and Grapefruit (major).

By severity: 11 major · 197 moderate · 44 minor.

From our pharmacist’s overview on the Acetaminophen, Butalbital, Caffeine page

“Alcohol is the interaction I would flag first for anyone taking acetaminophen, butalbital, and caffeine (Esgic, Fiogesic, and others). Drinking raises the risk of liver injury from the acetaminophen component, and 38 of the 252 supplement ingredients on file carry that same liver concern.”

Reviewed by 2 · Jul 18, 2026

Open the Acetaminophen, Butalbital, Caffeine interaction page

How much people look this up

Where Shellac and Acetaminophen, Butalbital, Caffeine 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 Shellac
Steady interest

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

29 days ago today
Medication Acetaminophen, Butalbital, Caffeine
Top 5%

#66 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.
  • Citation library: 103,510 references behind our interaction content, 65,311 of them resolved to verified PubMed/DOI sources. See every Shellac reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 20, 2026. The Shellac and Acetaminophen, Butalbital, Caffeine 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.
Data structure & sourcing designed and verified by .
Supplement

About Shellac

What is Shellac?

Shellac
  • Coating for tablets and capsules
  • Glaze on candy and chocolates
  • Protective film over pills and supplements
  • Enteric-style coating to delay dissolving
  • Shiny coating on fruits and confections

Shellac is a natural resin made from the secretions of the lac insect, and it is used mainly as a glaze or coating on pills, candy, and some supplements rather than as an active ingredient you take for a health benefit. In the small amounts used for coatings it is generally considered safe for most people, but those avoiding insect-derived products or with known sensitivities may want to steer clear.

Resinous secretion of the lac insect (Kerria lacca) · Tablet and capsule coatings, candy and pill glazes, food glaze (confectioner's glaze)

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

Shellac: dosing

There is no established therapeutic dose for shellac, because it is not taken as an active ingredient. It is used in whatever small amount is needed to coat or glaze a product.If you are choosing a supplement, you do not need to dose shellac itself.

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

Read the full Shellac monograph & all interactions
Medication

About Acetaminophen, Butalbital, and Caffeine

What Is Acetaminophen, Butalbital, and Caffeine Used For?

Brand names: Tecnal, Esgic Plus, Fiogesic, Triad, Repan, Esgic, Fioricet

This combination product — available as capsules, tablets, and oral solution under various names including Fioricet — is used to relieve the symptoms of tension headaches (also called muscle contraction headaches).

All supported products, including Fioricet capsules and the oral solution, share this same indication. Because butalbital can be habit-forming, extended or repeated use is not recommended, and these products are not established as safe or effective for treating headaches that come back frequently over time.

See full Acetaminophen, Butalbital, and Caffeine drug information
Keep checking

Other Drugs & Shellac

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

See the full Shellac interactions page
See every supplement checked against Acetaminophen, Butalbital, Caffeine, ranked by severity
Evidence & sources

Shellac References

The 8 references that drive our Shellac 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.

  1. The Review of Natural Products by Facts and Comparisons. St. Louis, MO: Wolters Kluwer Co., 1999.
  2. González-Villanueva I, Hispn Ocete P, Silvestre Salvador JF. Allergic contact dermatitis caused by a black tattoo ink in a patient allergic to shellac. Contact Dermatitis. 2016;75(4):247-8. PubMed
  3. Shaw T, Oostman H, Rainey D, Storrs F. A rare eyelid dermatitis allergen: shellac in a popular mascara. Dermatitis. 2009;20(6):341-5. DOI
  4. Gallo R, Marro I, Pavesi A. Allergic contact dermatitis from shellac in mascara. Contact Dermatitis. 2005;53(4):238. PubMed
  5. Strauss RM, Orton DI. Allergic contact cheilitis in the United Kingdom: a retrospective study. Am J Contact Dermat. 2003;14(2):75-7. DOI
  6. Orton DI, Salim A, Shaw S. Allergic contact cheilitis due to shellac. Contact Dermatitis. 2001;44(4):250. PubMed
  7. Navarro-Triviño FJ. Allergic contact dermatitis from shellac in an ecological hair spray occurring in a patient with frontal fibrosing alopecia. Contact Dermatitis 2022;86(6):544-545. PubMed
  8. Mercader-García P, Ruiz-Gonzalez I, Gonzalez-Perez R, Sanz-Sanchez T, Sanchez-Pérez J, Borrego L; en representación de REIDAC. Contact Allergy to Shellac. Retrospective Cross-Sectional Study With Data From the Spanish Registry of Research in Contact Derma

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 Shellac and Acetaminophen, Butalbital, Caffeine Together: Common Questions

Is it safe to take Shellac with Acetaminophen, Butalbital, Caffeine?
We do not list a known interaction between Shellac and Acetaminophen, Butalbital, Caffeine. 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.
Do Shellac and Acetaminophen, Butalbital, Caffeine have any of the same side effects?
Yes — our sources link each of them separately to one of the same effects. That is not an interaction: neither changes how your body handles the other. It does mean that if one of those effects turns up, it can be harder to tell which one is behind it. They are listed on this page with the source behind each.
Does Acetaminophen, Butalbital, Caffeine interact with any supplements?
Yes. Acetaminophen, Butalbital, Caffeine has documented interactions with 252 supplements in our database — Shellac is not one of them. The Acetaminophen, Butalbital, Caffeine 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

Shellac monograph Uses, safety profile, and every drug interaction in one place Acetaminophen, Butalbital, and Caffeine drug information The full plain-English guide to this medication Acetaminophen, Butalbital, Caffeine supplement interactions Every supplement checked against Acetaminophen, Butalbital, Caffeine, 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 8 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Acetaminophen, Butalbital, Caffeine and Shellac?

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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.