Glucagon and Amitriptyline: Interaction Details
AI-assisted, pharmacist-reviewed · AI content regenerated Jul 11, 2026 · Source data updated Jul 2, 2026 · Sources: FDA labeling, DDInter 2.0, cited literature
Amitriptyline
Glucagon
No brand names on record
How we grade severity & evidence
Severity levels
- Contraindicated: These should generally not be used together.
- Major: Potentially serious — often needs a change or close monitoring.
- Moderate: Can be significant — usually manageable with monitoring.
- Minor: Usually limited clinical impact.
Evidence grades
- Established: Well documented — supported by controlled studies or strong clinical data.
- Probable: Good supporting evidence, though not definitively proven.
- Suspected: Some evidence suggests this interaction, but it is not well established.
- Possible: Limited or conflicting evidence; the interaction may occur.
- Theoretical: Predicted from the drugs' pharmacology; not yet confirmed in people.
Ratings come from the documented interaction literature and are reviewed by a pharmacist. They describe the documented risk of the combination, not what will necessarily happen to you — your dose, timing, and health picture all matter.
Let me walk you through this one. Amitriptyline (Elavil) has what we call anticholinergic effects, which means it can slow down how your gut moves and cause things like constipation or bloating. Glucagon, when it's used as a helper during certain imaging tests, also slows the gut down on purpose. When you combine the two, those slowing effects can add up, so your digestion may get more sluggish than usual.
The good news is this is mostly a caution, not a common event, and your care team can manage it easily by planning around it. If you take amitriptyline regularly and a test using glucagon is being considered, just mention it so your team can decide the safest approach.
Effect: Additive inhibition of GI motility, increasing risk of gastrointestinal adverse reactions (constipation, ileus, distension).
Mechanism: Amitriptyline exerts significant anticholinergic (antimuscarinic) activity that slows GI transit; glucagon, when used as a diagnostic aid, is given specifically to relax/inhibit GI smooth muscle. Combined, the motility-suppressing effects are additive (pharmacodynamic, not metabolic; no prodrug involvement).
- Direction: Increased GI side-effect burden.
- Onset: Unspecified.
- Evidence: Theoretical.
- Severity on file: Major.
- Management: Concomitant use of glucagon as a diagnostic aid with anticholinergics is not recommended; if unavoidable, monitor GI function closely and individualize.
What happens
Increased risk of gastrointestinal side effects
Interaction Deep Dive
Using glucagon as a diagnostic aid together with anticholinergics is not advised. When glucagon and anticholinergics are administered together, the likelihood of gastrointestinal adverse reactions may rise, reflecting additive effects on the suppression of gastrointestinal motility12.
Why it happens (mechanism)
Additive effects on inhibition of gastrointestinal motility
How to manage this interaction
Here is how a care team typically handles this:
- Because this is a pharmacodynamic overlap (both drugs slow the gut), the standard guidance is that glucagon used as a diagnostic aid is not recommended alongside anticholinergics like amitriptyline.
- If you are having an imaging test, tell the team you take amitriptyline so they can choose the safest option and monitor you more closely for GI symptoms afterward.
- Watch for and report significant bloating, severe constipation, or belly pain.
Keep taking your amitriptyline as prescribed unless your prescriber tells you otherwise, and raise this with your pharmacist or doctor before any procedure using glucagon.
Management is individual — confirm any change with your pharmacist or prescriber.
Common questions
Can I take Glucagon and Amitriptyline together?
Amitriptyline and diagnostic glucagon can both slow the gut, so combining them may worsen GI side effects; this pairing is generally not recommended, so tell your care team you take amitriptyline before any test using glucagon. Always confirm with your pharmacist or prescriber before making any change.
How serious is the Glucagon and Amitriptyline interaction?
It is rated major. Potentially serious — often needs a change or close monitoring.
How quickly could this interaction happen?
The documented onset is "unspecified". The timing of this interaction is not well characterized.
How is the Glucagon and Amitriptyline interaction managed?
Here is how a care team typically handles this: Because this is a pharmacodynamic overlap (both drugs slow the gut), the standard guidance is that glucagon used as a diagnostic aid is not recommended alongside anticholinergics like amitriptyline. If you are having an imaging test, tell the team you take amitriptyline so they can choose the safest option and monitor you more closely for GI symptoms… Management is individual — always follow your own care team's guidance.
How strong is the evidence for this interaction?
The evidence is graded "theoretical". Predicted from the drugs' pharmacology; not yet confirmed in people.
From our Q&A
Real reader questions about these medications, each personally answered by our pharmacist:
Questions for your pharmacist
- Does my dose of Glucagon or Amitriptyline need adjusting while I take them together?
- What symptoms should prompt me to call you or my prescriber right away?
- Does the timing of my doses matter for this combination?
- Is there a safer alternative to one of these medications for me?
References (2)
- Product Information: GlucaGen(R) subcutaneous, intramuscular, intravenous injection, glucagon subcutaneous, intramuscular, intravenous injection. Boehringer Ingelheim Pharmaceuticals Inc (per FDA), Ridgefield, CT, 2021. DailyMed
- Product Information: GVOKE subcutaneous injection, intravenous injection, glucagon subcutaneous injection, intravenous injection. Xeris Pharmaceuticals Inc (per FDA), Chicago, IL, 2025. DailyMed
Keep reading about Amitriptyline
Keep reading about Glucagon
These medications also interact with supplements
Prescription drugs aren't the whole picture — herbal and dietary supplements can interact with them too. From the evidence-graded Natural Medicines database:
major · moderate · minor — check everything you take with our drug–supplement interaction checker.
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