Drug interactions
Bretylium + Dopamine
Severity: Moderate
Bretylium and Dopamine: 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
Bretylium initially releases norepinephrine from sympathetic nerve terminals and then blocks further release. During this phase it can enhance the pressor and arrhythmogenic effects of catecholamines such as dopamine. This can cause marked hypertension, tachycardia or ventricular arrhythmias.
What this interaction means in plain words
Bretylium and Dopamine 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
Bretylium inhibits neuronal catecholamine reuptake and causes transient norepinephrine release, which potentiates the adrenergic effects of dopamine.
What to do
Start dopamine at a low dose, titrate cautiously and monitor blood pressure, heart rate and ECG continuously. Reduce the dopamine dose if there is an exaggerated pressor response.
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 Dopamine
- Dihydroergotamine intranasal + Dopamine Contraindicated
- Dihydroergotamine + Dopamine Contraindicated
- Dopamine + Promethazine Contraindicated
- Dopamine + Selegiline transdermal Contraindicated
- Amitriptyline + Dopamine Major
- Clomipramine + Dopamine Major
Frequently asked questions
Can I take Bretylium with Dopamine?
MediHelp rates the interaction as moderate. Bretylium and Dopamine 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. Bretylium initially releases norepinephrine from sympathetic nerve terminals and then blocks further release. During this phase it can enhance the pressor and arrhythmogenic effects of catecholamines such as dopamine. This can cause marked hypertension, tachycardia or ventricular arrhythmias.
How serious is the interaction between Bretylium and Dopamine?
MediHelp rates it moderate, on a four-level scale (minor, moderate, major, contraindicated) based on published labels and references. What to do, in brief: Start dopamine at a low dose, titrate cautiously and monitor blood pressure, heart rate and ECG continuously. Reduce the dopamine dose if there is an exaggerated pressor response.
What other medicines interact with Dopamine?
MediHelp also lists interactions of Dopamine with, for example, Dihydroergotamine intranasal, Dihydroergotamine, Promethazine. The full list is on the Dopamine page.
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