amiodarone and phenylephrine hydrochloride: label evidence and limits

The phenylephrine hydrochloride injection label explicitly lists amiodarone among drugs that can oppose its blood-pressure-raising effect, and notes antagonism in the other direction as well.

Which products this evidence covers

Phenylephrine hydrochloride injection for intravenous use.

What this finding does and does not establish

This is an injection-label statement. It should not be extended to oral decongestants or nasal products, or used to infer an individual treatment decision.

Supporting label passage

α-adrenergic blocking agents, including phenothiazines (e.g., chlorpromazine) and amiodarone block phenylephrine and are in turn blocked by phenylephrine.

Read the product label on DailyMed. Section: 7.2 Antagonizing the Pressor Effect. Compared label version 4, dated 2024-02-22.

How this brief was prepared

This brief uses an AI-assisted source comparison dated 2026-10-16. The label version and supporting passage were checked again on 2026-10-25. Independent clinical review has not been recorded. The comparison does not validate CDI's severity category or determine individual treatment.

Discuss your exact medicines with your pharmacist

Ask whether the cited formulation and route apply to your products and circumstances. Confirm medication decisions with your pharmacist or prescriber before changing treatment.

Check your medication list with CDI.