Drug interactions
Isocarboxazid + Oxymetazoline
Severity: Major
Isocarboxazid and Oxymetazoline: major 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
MAOIs increase norepinephrine stores in adrenergic neurons, which may heighten the response to alpha-adrenergic agonists. Systemic absorption of intranasal oxymetazoline is low but can occasionally raise blood pressure, and MAOI labeling cautions against sympathomimetics.
What this interaction means in plain words
Isocarboxazid and Oxymetazoline can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for.
Isocarboxazid belongs to Central Nervous System; Oxymetazoline belongs to Respiratory.
Why it happens
MAO inhibition increases neuronal norepinephrine, enhancing pressor responses to alpha-adrenergic agonists.
What to do
Avoid oxymetazoline in patients taking an MAOI and use saline or other non-vasoconstrictor options. If a dose is given, monitor blood pressure and warn the patient about severe headache.
What to ask your pharmacist
- Does the benefit of taking both outweigh the risk in my case?
- Do I need any blood test, ECG or other check while on both?
- What early warning signs should I watch for, and what should I do if they appear?
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Other interactions of Oxymetazoline
- Oxymetazoline + Phenelzine Major
- Oxymetazoline + Tranylcypromine Major
- Amitriptyline + Oxymetazoline Moderate
- Amoxapine + Oxymetazoline Moderate
- Clomipramine + Oxymetazoline Moderate
- Desipramine + Oxymetazoline Moderate
Other interactions of Isocarboxazid
- 5-HTP + Isocarboxazid Contraindicated
- Amitriptyline + Isocarboxazid Contraindicated
- Amobarbital + Isocarboxazid Contraindicated
- Amoxapine + Isocarboxazid Contraindicated
- Apraclonidine + Isocarboxazid Contraindicated
- Atomoxetine + Isocarboxazid Contraindicated
Frequently asked questions
Can I take Isocarboxazid with Oxymetazoline?
MediHelp rates the interaction as major. Isocarboxazid and Oxymetazoline can interact in a way that may be serious. Using them together is sometimes necessary, but it needs a deliberate decision by the prescriber, a plan for monitoring, and clear advice on the warning signs to watch for. MAOIs increase norepinephrine stores in adrenergic neurons, which may heighten the response to alpha-adrenergic agonists. Systemic absorption of intranasal oxymetazoline is low but can occasionally raise blood pressure, and MAOI labeling cautions against sympathomimetics.
How serious is the interaction between Isocarboxazid and Oxymetazoline?
MediHelp rates it major, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Avoid oxymetazoline in patients taking an MAOI and use saline or other non-vasoconstrictor options. If a dose is given, monitor blood pressure and warn the patient about severe headache.
What other medicines interact with Oxymetazoline?
MediHelp also lists interactions of Oxymetazoline with, for example, Phenelzine, Tranylcypromine, Amitriptyline. The full list is on the Oxymetazoline page.
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