Drug interactions
Glibenclamide + Guanfacine
Severity: Minor
Glibenclamide and Guanfacine: minor interaction.
Last updated
For healthcare professionals — reference only. This page is a brief summary, not medical advice and not a substitute for official labeling or clinical judgement. Always verify before prescribing or dispensing.
Summary
Guanfacine, a central alpha-2 agonist, reduces sympathetic outflow and may blunt the adrenergic warning signs of hypoglycemia such as tremor and palpitations. A patient taking glyburide may therefore fail to recognize falling blood glucose early. Sweating is typically preserved.
What this interaction means in plain words
Glibenclamide and Guanfacine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Glibenclamide belongs to Endocrine; Guanfacine belongs to Cardiovascular.
Why it happens
Central sympatholytic action reduces the catecholamine-mediated symptoms of hypoglycemia.
What to do
Advise patients to monitor blood glucose routinely rather than rely on symptoms. Teach them that sweating and hunger may be the main warning signs.
What to ask your pharmacist
- Is there anything I should notice while taking both?
- Do I need to tell my doctor at the next visit?
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Other interactions of Glibenclamide
- Bosentan + Glibenclamide Contraindicated
- Cholic acid + Glibenclamide Major
- Ciprofloxacin + Glibenclamide Major
- Clarithromycin + Glibenclamide Major
- Fluconazole + Glibenclamide Major
- Glibenclamide + Insulin degludec-liraglutide Major
Other interactions of Guanfacine
- Clonidine + Guanfacine Major
- Guanfacine + Lofexidine Major
- Aldesleukin + Guanfacine Moderate
- Amiodarone + Guanfacine Moderate
- Amisulpride + Guanfacine Moderate
- Amitriptyline + Guanfacine Moderate
Frequently asked questions
Can I take Glibenclamide with Guanfacine?
MediHelp rates the interaction as minor. Glibenclamide and Guanfacine have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Guanfacine, a central alpha-2 agonist, reduces sympathetic outflow and may blunt the adrenergic warning signs of hypoglycemia such as tremor and palpitations. A patient taking glyburide may therefore fail to recognize falling blood glucose early. Sweating is typically preserved.
How serious is the interaction between Glibenclamide and Guanfacine?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Advise patients to monitor blood glucose routinely rather than rely on symptoms. Teach them that sweating and hunger may be the main warning signs.
What other medicines interact with Glibenclamide?
MediHelp also lists interactions of Glibenclamide with, for example, Bosentan, Cholic acid, Ciprofloxacin. The full list is on the Glibenclamide page.
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