Drug interactions
Epinephrine inhaled + Timolol
Severity: Moderate
Epinephrine inhaled 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
Timolol blocks beta-2 receptors in the airways and can blunt the bronchodilator response to inhaled epinephrine. In patients with asthma or COPD, even systemic absorption from timolol eye drops may provoke bronchospasm and reduce the benefit of rescue therapy.
What this interaction means in plain words
Epinephrine inhaled 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
Pharmacodynamic antagonism at beta-2 adrenergic receptors by the nonselective beta-blocker timolol.
What to do
Avoid timolol in patients who need bronchodilators for reactive airway disease where possible, or use a cardioselective agent or a non-beta-blocker alternative. Monitor respiratory status and response to epinephrine.
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 Epinephrine inhaled with Timolol?
MediHelp rates the interaction as moderate. Epinephrine inhaled 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. Timolol blocks beta-2 receptors in the airways and can blunt the bronchodilator response to inhaled epinephrine. In patients with asthma or COPD, even systemic absorption from timolol eye drops may provoke bronchospasm and reduce the benefit of rescue therapy.
How serious is the interaction between Epinephrine inhaled 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: Avoid timolol in patients who need bronchodilators for reactive airway disease where possible, or use a cardioselective agent or a non-beta-blocker alternative. Monitor respiratory status and response to epinephrine.
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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