Does Phenylephrine Hydrochloride Injection Solution Interact with Amiodarone?
Phenylephrine Hydrochloride Injection Solution and Amiodarone have a moderate drug interaction according to U.S. FDA drug labeling data. Alpha-adrenergic blocking agent blocks phenylephrine and is in turn blocked by phenylephrine. The mechanism involves antagonistic effects with α-adrenergic blocking agents. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This information is based on official FDA drug labeling sourced from OpenFDA and the NIH National Library of Medicine.
- Severity
- Moderate
- Phenylephrine Hydrochloride Injection Solution Class
- alpha-1 Adrenergic Agonist
- Management
- Monitor for effects
- Data Source
- U.S. FDA via OpenFDA
How This Interaction Works
The interaction between Phenylephrine Hydrochloride Injection Solution and Amiodarone occurs because antagonistic effects with α-adrenergic blocking agents. Clinically, this means alpha-adrenergic blocking agent blocks phenylephrine and is in turn blocked by phenylephrine. This is classified as a moderate interaction. While it may not require stopping either medication, your healthcare provider should be aware you are taking both so they can monitor for potential effects and adjust treatment if necessary.
What To Tell Your Doctor or Pharmacist
If you are taking Phenylephrine Hydrochloride Injection Solution and your doctor is considering prescribing Amiodarone (or vice versa), make sure to:
- Inform your doctor and pharmacist of all current medications, including over-the-counter drugs and supplements
- Ask whether the benefits of combining these medications outweigh the risks for your specific situation
- Ask what symptoms to watch for that would indicate the interaction is causing problems
- Ask whether any dosage adjustments are needed
- Never stop or change either medication without first consulting your healthcare provider