Drug & supplement interaction

Gamma Butyrolactone (gbl) + Dexamethasone

Dexamethasone brand names: Decadron, Hexadrol, Dexone, Ozurdex, Dexycu, and others.

No Known Interaction
Medically reviewed by · Updated July 2026 · Pair last verified Sep 13, 2026
The bottom line No known interaction

We found no known interaction between Gamma Butyrolactone (gbl) and Dexamethasone 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

Gamma Butyrolactone (gbl) and Dexamethasone

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 Dexamethasone and Gamma Butyrolactone (gbl) 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.

Gamma Butyrolactone (gbl) safety at a glance

Gamma Butyrolacton... overall Avoid GBL is a toxic, illegal substance that can cause coma and death; it should never be consumed.
Pregnancy Unsafe When used orally; avoid using. Read the full pregnancy detail
Breastfeeding Unsafe When used orally; avoid using. Read the full breastfeeding detail

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.

Still wondering about combining Dexamethasone and Gamma Butyrolactone (gbl)? Ask Dr. Brian Staiger, PharmD, BCPS directly ›
How we checked

Why No Interaction Is Listed for Dexamethasone

Interactions in our licensed database are recorded against drug classes, not just single drug names. Dexamethasone is filed under 8 classifications — including corticosteroids, cytochrome p450 2b6 (cyp2b6) substrates, cytochrome p450 3a4 (cyp3a4) inducers. Gamma Butyrolactone (gbl) has documented interactions with 10 drug classes — the most serious being alcohol (ethanol) (moderate), amphetamines (moderate) and anticonvulsants (moderate) — and none of Dexamethasone’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.

Keep it in perspective

Gamma Butyrolactone (gbl) Does Interact With Other Medications

Gamma Butyrolactone (gbl) has 271 moderate known drug interactions in our database — Dexamethasone isn’t one of them. If you take anything else, check it against the full list below.

Moderate 271 No known interaction 2,559 (incl. Dexamethasone)
Taking anything else?

Check Another of Your Medications Against Gamma Butyrolactone (gbl)

Covers the 2,830 medications we’ve checked against Gamma Butyrolactone (gbl). Pick one to open its full report.

What to actually watch for

No Interaction Found — But Data Suggests Gamma Butyrolactone (gbl) and Dexamethasone May Share Several of the Same Side Effects

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. 5 of them are worth acting on rather than waiting out — marked below.

  • A slow heartbeat Worth acting on Additional detail

    Gamma Butyrolactone (gbl)

    “Orally, GBL can cause bradycardia, hypotension, tachycardia, and cardiac arrest.

    Consistent use of GBL followed by abrupt discontinuation is associated with withdrawal symptoms, including tachycardia and hypertension.”

    Gamma Butyrolactone (gbl) · Natural Medicines adverse-effect record, reported in cardiac arrest.

    6 sources cited
    1. 665. LoVecchio F, Curry SC, Bagnasco T. Butyrolactone-induced central nervous system depression after ingestion of RenewTrient, a dietary supplement. N Engl J Med 1998;339:847-8.
    2. 682. FDA. FDA warns about products containing gamma butyrolactone or GBL and asks companies to issue a recall. Talk Paper, 21 January 1999.
    3. 1430. Anon. Adverse events associated with ingestion of gamma-butyrolactone--Minnesota, New Mexico, and Texas, 1998-1999. MMWR Morb Mortal Wkly Rep 1999;48:137-40.
    4. 95127. Corkery JM, Loi B, Claridge H, et al. Gamma hydroxybutyrate (GHB), gamma butyrolactone (GBL) and 1,4-butanediol (1,4-BD; BDO): A literature review with a focus on UK fatalities related to non-medical use. Neurosci Biobehav Rev 2015;53:52-78. PubMed
    5. 95128. Dargan PI, Button J, Davies S, et al. The first reported UK fatality related to gamma-butyrolactone (GBL) ingestion. J R Soc Med 2009;102(12):546-7.
    6. 95130. Heytens L, Neels H, Van Regenmortel N, et al. Near-fatal persistent anion- and osmolal-gap acidosis due to massive gamma-butyrolactone/ethanol intoxication. Ann Clin Biochem 2015;52(Pt 2):283-7. PubMed

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

  • Fainting Worth acting on Additional detail

    Gamma Butyrolactone (gbl)

    “Orally, GBL can cause fainting, seizures, and severe central nervous system depression. In many cases, unconsciousness or coma have been reported.

    Withdrawal symptoms have been reported in people who ingest diluted products containing almost pure GBL every few hours. Withdrawal symptoms can start within 2-72 hours and can last for up to 15 days.”

    Gamma Butyrolactone (gbl) · Natural Medicines adverse-effect record, reported in depression.

    6 sources cited
    1. 665. LoVecchio F, Curry SC, Bagnasco T. Butyrolactone-induced central nervous system depression after ingestion of RenewTrient, a dietary supplement. N Engl J Med 1998;339:847-8.
    2. 682. FDA. FDA warns about products containing gamma butyrolactone or GBL and asks companies to issue a recall. Talk Paper, 21 January 1999.
    3. 1430. Anon. Adverse events associated with ingestion of gamma-butyrolactone--Minnesota, New Mexico, and Texas, 1998-1999. MMWR Morb Mortal Wkly Rep 1999;48:137-40.
    4. 93819. Bosch OG, Eisenegger C, Gertsch J, et al. Gamma-hydroxybutyrate enhances mood and prosocial behavior without affecting plasma oxytocin and testosterone. Psychoneuroendocrinology. 2015 Dec;62:1-10. PubMed
    5. 95127. Corkery JM, Loi B, Claridge H, et al. Gamma hydroxybutyrate (GHB), gamma butyrolactone (GBL) and 1,4-butanediol (1,4-BD; BDO): A literature review with a focus on UK fatalities related to non-medical use. Neurosci Biobehav Rev 2015;53:52-78. PubMed
    6. 95129. Eiden C, Capdevielle D, Deddouche C, et al. Neuroleptic malignant syndrome-like reaction precipitated by antipsychotics in a patient with gamma-butyrolactone withdrawal. J Addict Med 2011;5(4):302-3. PubMed

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

  • Seizures Worth acting on Additional detail

    Gamma Butyrolactone (gbl)

    Recorded for Gamma Butyrolactone (gbl) in the same Natural Medicines adverse-effect record shown under A slow heartbeat above.

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

  • Raised blood pressure Worth acting on Additional detail

    Gamma Butyrolactone (gbl)

    Recorded for Gamma Butyrolactone (gbl) in the same Natural Medicines adverse-effect record shown under A slow heartbeat above.

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

  • A higher chance of infection Worth acting on reported in 4.6% of FDA reports for Dexamethasone Additional detail

    Gamma Butyrolactone (gbl)

    “Orally, GBL can cause slow breathing and respiratory depression resulting in cyanosis, apnea, and hypoxia, possibly requiring intubation. In one case report, a 44-year-old female developed acute lung injury, or chemical pneumonitis, with bilateral alveolar inflammatory consolidations after chronic ingestion of GBL. Infectious sources were ruled out.”

    Gamma Butyrolactone (gbl) · Natural Medicines adverse-effect record, reported in depression.

    6 sources cited
    1. 665. LoVecchio F, Curry SC, Bagnasco T. Butyrolactone-induced central nervous system depression after ingestion of RenewTrient, a dietary supplement. N Engl J Med 1998;339:847-8.
    2. 682. FDA. FDA warns about products containing gamma butyrolactone or GBL and asks companies to issue a recall. Talk Paper, 21 January 1999.
    3. 1430. Anon. Adverse events associated with ingestion of gamma-butyrolactone--Minnesota, New Mexico, and Texas, 1998-1999. MMWR Morb Mortal Wkly Rep 1999;48:137-40.
    4. 4259. FDA Talk Paper. FDA Warns About GBL-Related Products. 1999. Available at: vm.cfsan.fda.gov/~lrd/tpgbl2.html
    5. 95118. Bhattacharya IS, Watson F, Bruce M. A case of ?-butyrolactone associated with severe withdrawal delirium and acute renal failure. Eur Addict Res 2011;17(4):169-71. PubMed
    6. 95127. Corkery JM, Loi B, Claridge H, et al. Gamma hydroxybutyrate (GHB), gamma butyrolactone (GBL) and 1,4-butanediol (1,4-BD; BDO): A literature review with a focus on UK fatalities related to non-medical use. Neurosci Biobehav Rev 2015;53:52-78. PubMed

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone, and in voluntary FDA adverse-event reports. Read the label on DailyMed ›

  • Sweating / Trouble sleeping Additional detail

    Gamma Butyrolactone (gbl)

    Recorded for Gamma Butyrolactone (gbl) in the same Natural Medicines adverse-effect record shown under Fainting above.

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

  • A fast or pounding heartbeat / Low blood pressure Additional detail

    Gamma Butyrolactone (gbl)

    Recorded for Gamma Butyrolactone (gbl) in the same Natural Medicines adverse-effect record shown under A slow heartbeat above.

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

  • Anxiety or restlessness Additional detail

    Gamma Butyrolactone (gbl)

    “Orally, GBL can cause mental changes, such as agitation, combativeness, and amnesia.

    Withdrawal symptoms have been reported in people who ingest diluted products containing almost pure GBL every few hours. Withdrawal symptoms can start within 2-72 hours and can last up to 15 days.”

    Gamma Butyrolactone (gbl) · Natural Medicines adverse-effect record, reported in anxiety.

    6 sources cited
    1. 665. LoVecchio F, Curry SC, Bagnasco T. Butyrolactone-induced central nervous system depression after ingestion of RenewTrient, a dietary supplement. N Engl J Med 1998;339:847-8.
    2. 682. FDA. FDA warns about products containing gamma butyrolactone or GBL and asks companies to issue a recall. Talk Paper, 21 January 1999.
    3. 1430. Anon. Adverse events associated with ingestion of gamma-butyrolactone--Minnesota, New Mexico, and Texas, 1998-1999. MMWR Morb Mortal Wkly Rep 1999;48:137-40.
    4. 95118. Bhattacharya IS, Watson F, Bruce M. A case of ?-butyrolactone associated with severe withdrawal delirium and acute renal failure. Eur Addict Res 2011;17(4):169-71. PubMed
    5. 95129. Eiden C, Capdevielle D, Deddouche C, et al. Neuroleptic malignant syndrome-like reaction precipitated by antipsychotics in a patient with gamma-butyrolactone withdrawal. J Addict Med 2011;5(4):302-3. PubMed
    6. 10375. Schneir AB, Ly BT, Clark RF. A case of withdrawal from the GHB precursors gamma-butyrolactone and 1,4-butanediol. J Emerg Med 2001;21:31-3.. PubMed

    Dexamethasone

    Listed in the ADVERSE REACTIONS section of the FDA label for Dexamethasone. Read the label on DailyMed ›

Showing the 10 most notable of 13 shared effects — ranked by how unusual each one is, not just whether both lists mention it.

Reported for Gamma Butyrolactone (gbl) but not commonly for Dexamethasone: dependence or withdrawal symptoms, kidney problems, hallucinations and severe muscle breakdown.

Effects for Dexamethasone come from the ADVERSE REACTIONS section of its FDA label; effects for Gamma Butyrolactone (gbl) come from the Natural Medicines adverse-effect record, quoted above. Where a percentage is shown, it is the share of 308,307 voluntary FDA FAERS reports for Dexamethasone that mention that effect — a reporting proportion, not an incidence rate and not evidence the drug caused it. Wording is matched across sources by our own clinical vocabulary, so treat this as a prompt to pay attention, not a diagnosis.

Special populations

Gamma Butyrolactone (gbl) in Pregnancy & Breastfeeding

Pregnancy And Lactation Unsafe

When used orally; avoid using.

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

From our Q&A

Questions About Gamma Butyrolactone (gbl) or Dexamethasone

These are real questions from readers, answered by the pharmacists at HelloPharmacist — written by a person, not generated from a database. Each one covers Gamma Butyrolactone (gbl) or Dexamethasone, 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 Dexamethasone

This page covers Gamma Butyrolactone (gbl) only. If you take other supplements — a multivitamin, a sleep aid, something for joints — the Dexamethasone page lists 221 supplements it has a documented interaction with, worst first, each one explained.

The most serious there right now: Activated Charcoal (major), Grapefruit (major), Lily-of-the-valley (major), St. John's Wort (major) and Acacia Rigidula (moderate).

By severity: 4 major · 182 moderate · 35 minor.

From our pharmacist’s overview on the Dexamethasone page

“People take dexamethasone for serious reasons, a chemotherapy course, an autoimmune flare, brain swelling, so I want anyone on it to give its 221 supplement interactions genuine attention, starting with the four rated major. Grapefruit and St.”

Reviewed by 2 · Jul 18, 2026

Open the Dexamethasone interaction page

How much people look this up

Where Gamma Butyrolactone (gbl) and Dexamethasone 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 Gamma Butyrolactone (gbl)
Steady interest

#1,195 of 1,452 supplements looked up here in the last 7 days

29 days ago today
Medication Dexamethasone
Top 10%

#164 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 Gamma Butyrolactone (gbl) reference on this page ↓
  • Freshness: we automatically re-check this combination every week — this pair was last verified September 13, 2026. The Gamma Butyrolactone (gbl) and Dexamethasone 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 Gamma Butyrolactone (gbl)

What is Gamma Butyrolactone (gbl)?

Gamma Butyrolactone (gbl)
  • Recreational intoxication and euphoria
  • Relaxation and sedation
  • Sleep aid (misused)
  • Bodybuilding/muscle building claims (unproven)
  • Industrial solvent and cleaner

Gamma butyrolactone (GBL) is a toxic industrial solvent, not a dietary supplement, and the body converts it into GHB, a powerful and dangerous sedative. It is illegal to sell or possess for human use in the United States, has no proven medical or supplemental benefit, and can cause coma, seizures, and death. Do not take GBL — if you are seeking help for sleep, anxiety, or substance use, talk to a doctor or pharmacist.

Not applicable (synthetic industrial chemical) · Liquid (illicitly sold); used industrially as a solvent

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

Gamma Butyrolactone (gbl): dosing

There is no safe or recommended dose of GBL. It is not a supplement, it is illegal to sell for human use, and any amount can be dangerous because it converts into the potent sedative GHB.No pharmacist or doctor should recommend taking GBL.

From our Gamma Butyrolactone (gbl) monograph — the full record covers uses, side effects and every documented interaction.

Read the full Gamma Butyrolactone (gbl) monograph & all interactions
Medication

About Dexamethasone

What Is Dexamethasone Used For?

Brand names: Decadron, Hexadrol, Dexone, Ozurdex, Dexycu, Hemady, Dextenza

Dexamethasone is used to treat a wide range of conditions depending on the form and route. Oral tablets and solutions treat severe allergic reactions (such as asthma, contact dermatitis, and seasonal allergic rhinitis), inflammatory skin diseases, endocrine disorders including adrenal insufficiency and congenital adrenal hyperplasia, gastrointestinal diseases such as ulcerative colitis and regional enteritis, blood disorders, rheumatic conditions, kidney disease, and respiratory conditions including tuberculosis complications. Hemady (oral tablet) is specifically approved, in combination with other medicines, for multiple myeloma in adults. TaperDex (6-day and 12-day oral tablet packs) are used for the same broad range of allergic, inflammatory, and endocrine conditions.

Injectable forms (intramuscular and intravenous) are used when oral treatment is not possible, covering endocrine emergencies, shock, rheumatic disorders, and more. Eye-specific products treat different conditions: Dextenza (intracanalicular insert) treats eye inflammation and pain after eye surgery and itching from allergic conjunctivitis. Ozurdex (intravitreal implant) treats macular edema from retinal vein occlusion and diabetic macular edema, and non-infectious uveitis in the back of the eye. Dexycu (intraocular injection) treats inflammation after eye surgery. Maxidex (ophthalmic suspension) and dexamethasone sodium phosphate eye drops treat steroid-responsive inflammatory conditions of the eye. The ophthalmic/otic solution also treats steroid-responsive inflammation of the outer ear canal. A topical ointment (Seacall) is used for skin conditions including contact dermatitis, eczema, and neurodermatitis.

Most-Reported Side Effects for Dexamethasone

From FAERS, the FDA’s public side-effect reporting system (308,307 reports, all brands). Reports are voluntary and are not proof the drug caused the effect.

Fatigue 17,772 reports
Diarrhea 17,597 reports
Nausea 14,727 reports
Plasma cell myeloma 14,363 reports
Pneumonia 14,122 reports
See full Dexamethasone drug information
Keep checking

Other Drugs & Gamma Butyrolactone (gbl)

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

0Major
271Moderate
0Minor
2,558No known interaction
271 Moderate 2,558 No interaction
Moderate

271 interactions

Showing 60 of 271 moderate interactions — see all 271 on the Gamma Butyrolactone (gbl) page.

No interaction 2,558 drugs checked — show the list

We also checked Gamma Butyrolactone (gbl) against these medications and found no known interaction in our sources. Open any page to confirm.

Showing the 60 most looked-up of 2,558 medications checked with no known interaction — see the full Gamma Butyrolactone (gbl) list.

See the full Gamma Butyrolactone (gbl) interactions page
See every supplement checked against Dexamethasone, ranked by severity
Evidence & sources

Gamma Butyrolactone (gbl) References

The 28 references that drive our Gamma Butyrolactone (gbl) 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. Soderling E, Le Bell A, Kirstila V, Tenovuo J. Betaine-containing toothpaste relieves subjective symptoms of dry mouth. Acta Odontol Scand 1998;56:65-9.
  2. LoVecchio F, Curry SC, Bagnasco T. Butyrolactone-induced central nervous system depression after ingestion of RenewTrient, a dietary supplement. N Engl J Med 1998;339:847-8.
  3. FDA. FDA warns about products containing gamma butyrolactone or GBL and asks companies to issue a recall. Talk Paper, 21 January 1999.
  4. Anon. Adverse events associated with ingestion of gamma-butyrolactone--Minnesota, New Mexico, and Texas, 1998-1999. MMWR Morb Mortal Wkly Rep 1999;48:137-40.
  5. Harrington RD, Woodward JA, Hooton TM, et al. Life-threatening interactions between HIV-1 protease inhibitors and the illicit drugs MDMA and gamma-hydroxybutyrate. Arch Intern Med 1999;159:2221-4.
  6. Anon. FDA alert on misuse of consumer products containing GHB, GBL and BD. Food and Drug Administration, Rockville, MD. June 15, 1999.
  7. Anon. Important message for health professionals: Report serious adverse events associated with dietary supplements containing GBL, GHB or BD. Food and Drug Administration, Rockville, MD. August 25, 1999. Available at: http://vm.cfsan.fda.gov/~dms/mwg
  8. Anon. Multistate outbreak of poisonings associated with illicit use of gamma hydroxy butyrate. JAMA 1991;265:447-8. DOI
  9. Carotenuto A, De Feo V, Fattorusso E, et al. The flavonoids of Allium ursinum. Phytochem 1996;41:531-6. PubMed
  10. FDA Talk Paper. FDA Warns About GBL-Related Products. 1999. Available at: vm.cfsan.fda.gov/~lrd/tpgbl2.html
  11. Ferrara SD, Tedeschi L, Frison G, Rossi A. Fatality due to gamma-hydroxybutyric acid (GHB) and heroin intoxication. J Forensic Sci 1995;40:501-4. DOI
  12. Schneir AB, Ly BT, Clark RF. A case of withdrawal from the GHB precursors gamma-butyrolactone and 1,4-butanediol. J Emerg Med 2001;21:31-3.. PubMed
  13. Sivilotti ML, Burns MJ, Aaron CK, Greenberg MJ. Pentobarbital for severe gamma-butyrolactone withdrawal. Ann Emerg Med 2001;38:660-5.. PubMed
  14. Bosch OG, Eisenegger C, Gertsch J, et al. Gamma-hydroxybutyrate enhances mood and prosocial behavior without affecting plasma oxytocin and testosterone. Psychoneuroendocrinology. 2015 Dec;62:1-10. PubMed
  15. Thai D, Dyer JE, Benowitz NL, Haller CA. Gamma-hydroxybutyrate and ethanol effects and interactions in humans. J Clin Psychopharmacol. 2006 Oct;26(5):524-9. 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.

Pharmacist Counseling Corner

Taking Gamma Butyrolactone (gbl) and Dexamethasone Together: Common Questions

Is it safe to take Gamma Butyrolactone (gbl) with Dexamethasone?
We do not list a known interaction between Gamma Butyrolactone (gbl) and Dexamethasone. 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 Gamma Butyrolactone (gbl) and Dexamethasone have any of the same side effects?
Yes — our sources link each of them separately to 10 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.
How was the Gamma Butyrolactone (gbl) and Dexamethasone combination checked?
Interactions in our licensed database are recorded against drug classes. Dexamethasone is filed under 8 classifications, and Gamma Butyrolactone (gbl) has documented interactions with 10 drug classes — none of Dexamethasone's classifications are among them. A medication can belong to classes beyond those recorded in our dataset, so this describes how the check was run rather than guaranteeing safety.
Does Gamma Butyrolactone (gbl) interact with any other medications?
Yes. Gamma Butyrolactone (gbl) has 271 documented drug interactions in our database — Dexamethasone is simply not one of them. If you take anything else, it is worth checking each one; they are all listed on this page.
Does Dexamethasone interact with any supplements?
Yes. Dexamethasone has documented interactions with 221 supplements in our database — Gamma Butyrolactone (gbl) is not one of them. The Dexamethasone 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

Gamma Butyrolactone (gbl) monograph Uses, safety profile, and every drug interaction in one place Dexamethasone drug information The full plain-English guide to this medication Dexamethasone supplement interactions Every supplement checked against Dexamethasone, 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 28 citations behind this page Ask a pharmacist Free, personal answer from our licensed team

Still Have a Question About Dexamethasone and Gamma Butyrolactone (gbl)?

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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.