Drug interactions
Diphenhydramine + Ipratropium-salbutamol
Severity: Minor
Diphenhydramine and Ipratropium-salbutamol: 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
Diphenhydramine has strong anticholinergic and sedative effects that could theoretically add to those of ipratropium, but systemic absorption of inhaled ipratropium is low. Salbutamol may cause nervousness or tremor that partly offsets sedation.
What this interaction means in plain words
Diphenhydramine and Ipratropium-salbutamol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised.
Diphenhydramine belongs to Respiratory; Ipratropium-salbutamol belongs to Respiratory.
Why it happens
Additive muscarinic blockade, limited by low systemic ipratropium exposure.
What to do
No dose change is generally needed. Monitor for urinary retention, dry mouth and confusion in elderly patients.
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 Ipratropium-salbutamol
Other interactions of Diphenhydramine
Frequently asked questions
Can I take Diphenhydramine with Ipratropium-salbutamol?
MediHelp rates the interaction as minor. Diphenhydramine and Ipratropium-salbutamol have a small, usually unimportant interaction. Most people can take both; the pharmacist may still mention it so that any unexpected effect is recognised. Diphenhydramine has strong anticholinergic and sedative effects that could theoretically add to those of ipratropium, but systemic absorption of inhaled ipratropium is low. Salbutamol may cause nervousness or tremor that partly offsets sedation.
How serious is the interaction between Diphenhydramine and Ipratropium-salbutamol?
MediHelp rates it minor, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: No dose change is generally needed. Monitor for urinary retention, dry mouth and confusion in elderly patients.
What other medicines interact with Ipratropium-salbutamol?
MediHelp also lists interactions of Ipratropium-salbutamol with, for example, Amisulpride, Arsenic trioxide, Carvedilol. The full list is on the Ipratropium-salbutamol page.
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