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Does Epinephrine Interact with Phentolamine?

CDI records a major classification for Epinephrine and Phentolamine. The stored summary is: Alpha-adrenergic blocking drugs antagonize the vasoconstricting and hypertensive effects of epinephrine. The mechanism involves alpha-adrenergic antagonism. Patients taking both medications should consult their healthcare provider before starting, stopping, or changing the dosage of either drug. This record was extracted from drug labeling through openFDA. NIH/NLM RxNorm is used for drug identities. The summary and severity classification are CDI's processed information, not a verbatim source quotation. Product, route, and patient circumstances matter.

Severity: Major
Epinephrine Class: alpha-Adrenergic Agonist
Management: Close medical supervision required
Data Source: U.S. FDA via OpenFDA

Recorded Mechanism

alpha-adrenergic antagonism

What To Tell Your Doctor or Pharmacist

If you are taking Epinephrine and your doctor is considering prescribing Phentolamine (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 how frequently you should be monitored while these are co-prescribed
Ask whether any dosage adjustments are needed
Never stop or change either medication without first consulting your healthcare provider

💊 Epinephrine(Adrenalin)+💊 Phentolamine(Ryzumvi)

Severity & Interaction Details

⚠️

major

Use with caution — major interaction

Serious risk of clinically significant harm. Generally avoid; if used, monitor closely.

Severity scale

MinorContra

On record

Yes

Drug A class

alpha-Adrenergic Agonist

Drug B class

—

Source

NLP:epinephrine

What this means in plain English

Alpha-adrenergic blocking drugs antagonize the vasoconstricting and hypertensive effects of epinephrine.

About Epinephrine and Phentolamine

Epinephrine is an alpha-Adrenergic Agonist. You may recognize them by the brand names Adrenalin and Ryzumvi.

Source and Limitations

This record was produced by automated extraction from drug-label information, including AI processing. The summary and mechanism are not verbatim FDA quotations. The drug profiles below may describe different formulations from the source label. Confirm the exact product and route with your pharmacist. This page does not establish independent clinical review.

📖 Source: NLP:epinephrine

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How this information is prepared: CDI uses automated extraction, including AI, to summarize drug labeling from openFDA and includes separately identified curated-reference records. RxNorm helps identify medications; it does not verify interaction claims. Extracted summaries and CDI severity classifications can contain errors and are not verbatim FDA statements or independent clinical review. Maintained by CheckDrugInteractions.com. See our methodology or report a correction at support@checkdruginteractions.com.

Data sourced from U.S. FDA drug labeling via openFDA and the NIH National Library of Medicine, supplemented with a small number of well-established interactions from curated clinical references. For informational purposes only. Always consult your pharmacist or physician.