Drug interactions
Insulin regular human + Timolol
Severity: Moderate
Insulin regular human and Timolol: 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
Nonselective beta-blockers like timolol can mask adrenergic warning symptoms of hypoglycemia such as tremor and tachycardia, and delay glucose recovery. Sweating may persist, and glucose tolerance can worsen with long-term use.
What this interaction means in plain words
Insulin regular human and Timolol 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
Beta-blockade impairs glycogenolysis and gluconeogenesis responses and blunts sympathetic symptoms of hypoglycemia.
What to do
Monitor blood glucose more frequently and educate the patient that hypoglycemia may present with sweating rather than tremor or palpitations. Adjust insulin as required, or prefer a cardioselective beta-blocker where possible.
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 Timolol
- Acebutolol + Timolol Major
- Aldesleukin + Timolol Major
- Amifostine + Timolol Major
- Amiodarone + Timolol Major
- Arformoterol + Timolol Major
- Atenolol-chlorthalidone + Timolol Major
Frequently asked questions
Can I take Insulin regular human with Timolol?
MediHelp rates the interaction as moderate. Insulin regular human and Timolol 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. Nonselective beta-blockers like timolol can mask adrenergic warning symptoms of hypoglycemia such as tremor and tachycardia, and delay glucose recovery. Sweating may persist, and glucose tolerance can worsen with long-term use.
How serious is the interaction between Insulin regular human and Timolol?
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 the patient that hypoglycemia may present with sweating rather than tremor or palpitations. Adjust insulin as required, or prefer a cardioselective beta-blocker where possible.
What other medicines interact with Timolol?
MediHelp also lists interactions of Timolol with, for example, Acebutolol, Aldesleukin, Amifostine. The full list is on the Timolol page.
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