Drug interactions
Insulin nph + Propranolol
Severity: Moderate
Insulin nph and Propranolol: moderate 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
Propranolol can mask adrenergic warning signs of hypoglycemia such as tremor and tachycardia, and it delays glucose recovery. Sweating may persist, and a hypertensive reaction can occur during hypoglycemia.
What this interaction means in plain words
Insulin nph and Propranolol can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken.
Why it happens
Non-selective beta blockade impairs glycogenolysis and counterregulation and blunts sympathetic hypoglycemia symptoms.
What to do
Monitor blood glucose more frequently and educate patients that hypoglycemia may present with sweating only. Consider a cardioselective beta blocker if one is needed.
What to ask your pharmacist
- Should I take them at different times of day?
- Does the dose of either medicine need to change?
- Is there anything I should avoid, such as alcohol or certain foods, while on both?
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Other interactions of Propranolol
- Propranolol + Thioridazine Contraindicated
- Acebutolol + Propranolol Major
- Adrenaline-articaine + Propranolol Major
- Amifostine + Propranolol Major
- Amiodarone + Propranolol Major
- Arformoterol + Propranolol Major
Frequently asked questions
Can I take Insulin nph with Propranolol?
MediHelp rates the interaction as moderate. Insulin nph and Propranolol can affect each other. The combination is often manageable, but it may need a change of dose, a change of timing, or extra checks while both are taken. Propranolol can mask adrenergic warning signs of hypoglycemia such as tremor and tachycardia, and it delays glucose recovery. Sweating may persist, and a hypertensive reaction can occur during hypoglycemia.
How serious is the interaction between Insulin nph and Propranolol?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Monitor blood glucose more frequently and educate patients that hypoglycemia may present with sweating only. Consider a cardioselective beta blocker if one is needed.
What other medicines interact with Propranolol?
MediHelp also lists interactions of Propranolol with, for example, Thioridazine, Acebutolol, Adrenaline-articaine. The full list is on the Propranolol page.
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