Drug interactions
Droxidopa + Phenylephrine
Severity: Moderate
Droxidopa 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
Droxidopa is converted to norepinephrine and phenylephrine is a direct alpha-1 agonist, so combining them can produce additive pressor effects. This raises the risk of supine hypertension and possibly reflex bradycardia or arrhythmia.
What this interaction means in plain words
Droxidopa 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.
Droxidopa belongs to Cardiovascular; Phenylephrine belongs to Respiratory.
Why it happens
Additive vasoconstriction and pressor effects from norepinephrine formed from droxidopa and direct alpha-1 stimulation by phenylephrine.
What to do
Monitor supine and standing blood pressure and avoid the combination unless clearly needed. Elevate the head of the bed and reduce doses if supine hypertension occurs.
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 Droxidopa
- Droxidopa + Lisdexamfetamine Major
- Droxidopa + Methamphetamine Major
- Droxidopa + Pseudoephedrine Major
- Adrenaline-articaine + Droxidopa Moderate
- Almotriptan + Droxidopa Moderate
- Caffeine + Droxidopa Moderate
Frequently asked questions
Can I take Droxidopa with Phenylephrine?
MediHelp rates the interaction as moderate. Droxidopa 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. Droxidopa is converted to norepinephrine and phenylephrine is a direct alpha-1 agonist, so combining them can produce additive pressor effects. This raises the risk of supine hypertension and possibly reflex bradycardia or arrhythmia.
How serious is the interaction between Droxidopa 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 supine and standing blood pressure and avoid the combination unless clearly needed. Elevate the head of the bed and reduce doses if supine hypertension occurs.
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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