Drug interactions
Phenylephrine po + Terbutaline
Severity: Moderate
Phenylephrine po and Terbutaline: 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
Oral phenylephrine is an alpha-1 agonist decongestant that can raise blood pressure, and terbutaline contributes tachycardia and tremor. Combined use may produce additive cardiovascular stimulation, which matters for patients with hypertension or heart disease.
What this interaction means in plain words
Phenylephrine po and Terbutaline 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
Additive adrenergic stimulation through alpha-1 agonism and beta-2 agonism.
What to do
Monitor blood pressure and heart rate, and avoid oral decongestants in patients with uncontrolled hypertension or arrhythmia. Use non-adrenergic options for nasal congestion if 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 Terbutaline
Frequently asked questions
Can I take Phenylephrine po with Terbutaline?
MediHelp rates the interaction as moderate. Phenylephrine po and Terbutaline 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. Oral phenylephrine is an alpha-1 agonist decongestant that can raise blood pressure, and terbutaline contributes tachycardia and tremor. Combined use may produce additive cardiovascular stimulation, which matters for patients with hypertension or heart disease.
How serious is the interaction between Phenylephrine po and Terbutaline?
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, and avoid oral decongestants in patients with uncontrolled hypertension or arrhythmia. Use non-adrenergic options for nasal congestion if possible.
What other medicines interact with Terbutaline?
MediHelp also lists interactions of Terbutaline with, for example, Carvedilol, Droperidol, Fexinidazole. The full list is on the Terbutaline page.
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