Drug interactions
Atomoxetine + Phenylephrine
Severity: Moderate
Atomoxetine and Phenylephrine: 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
Atomoxetine can increase blood pressure and heart rate, and phenylephrine is a direct alpha-1 agonist vasopressor. Together they may produce an exaggerated pressor response and tachycardia.
What this interaction means in plain words
Atomoxetine and Phenylephrine 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.
Atomoxetine belongs to Central Nervous System; Phenylephrine belongs to Respiratory.
Why it happens
Additive adrenergic effects: noradrenaline reuptake inhibition by atomoxetine plus direct alpha-1 agonism by phenylephrine.
What to do
Monitor blood pressure and heart rate, especially with parenteral phenylephrine or repeated decongestant use. Titrate vasopressor doses cautiously.
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 Phenylephrine
- Isocarboxazid + Phenylephrine Contraindicated
- Phenelzine + Phenylephrine Contraindicated
- Phenylephrine + Tranylcypromine Contraindicated
- Bromocriptine + Phenylephrine Major
- Cocaine + Phenylephrine Major
- Dihydroergotamine intranasal + Phenylephrine Major
Other interactions of Atomoxetine
- Atomoxetine + Isocarboxazid Contraindicated
- Atomoxetine + Linezolid Contraindicated
- Atomoxetine + Phenelzine Contraindicated
- Atomoxetine + Procarbazine Contraindicated
- Atomoxetine + Rasagiline Contraindicated
- Atomoxetine + Selegiline Contraindicated
Frequently asked questions
Can I take Atomoxetine with Phenylephrine?
MediHelp rates the interaction as moderate. Atomoxetine and Phenylephrine 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. Atomoxetine can increase blood pressure and heart rate, and phenylephrine is a direct alpha-1 agonist vasopressor. Together they may produce an exaggerated pressor response and tachycardia.
How serious is the interaction between Atomoxetine and Phenylephrine?
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 pressure and heart rate, especially with parenteral phenylephrine or repeated decongestant use. Titrate vasopressor doses cautiously.
What other medicines interact with Phenylephrine?
MediHelp also lists interactions of Phenylephrine with, for example, Isocarboxazid, Phenelzine, Tranylcypromine. The full list is on the Phenylephrine page.
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