warnings
WARNINGS Phenoxybenzamine-induced alpha -adrenergic blockade leaves beta -adrenergic receptors unopposed. Compounds that stimulate both types of receptors may, therefore, produce an exaggerated hypotensive response and tachycardia.
FDA label cc8b3ef0-6aff-4f45-a398-b483c34fceeb
openFDA label record#
This page contains supplementary openFDA label data. For the canonical label presentation, use the corresponding DailyMed Structured Product Label.
Verified complete openFDA source JSON
- SPL set ID
- 79a53bb1-fa5a-41a7-aeaf-01a60fb4f810
- SPL ID
- cc8b3ef0-6aff-4f45-a398-b483c34fceeb
- Version
- 5
- Effective date
- 2022-11-30
- Source export date
- 2026-09-28
- Source partition
- 2
- Source file
- https://download.open.fda.gov/drug/label/drug-label-0002-of-0014.json.zip
- Source object key
- raw/openfda/drug-label/2026-09-28/f7d2b6e3f8600cd856280ab55a9c6fa54a642647191d164f9d1110e89f3f4097/drug-label-0002-of-0014.json.zip
- Source manifest SHA-256
- cd2e66336a5cd2223fa3995098fdbdb84c6a7ee5c0a4addb236ccb22dd1e6887
- Import run
- 20260929T050834Z
- Imported at
- 2026-09-29 05:16:05
Harmonized identifier links#
Every typed identifier imported from the complete openFDA harmonization object is paginated here; values are not reduced to a first match.
| Type | Scope | Identifier | Source field |
|---|---|---|---|
| spl id | cc8b3ef0-6aff-4f45-a398-b483c34fceeb | id | |
| spl set id | 79a53bb1-fa5a-41a7-aeaf-01a60fb4f810 | set_id |
Warnings cross-check#
openFDA text is shown for search and cross-checking; DailyMed SPL is canonical.
Adverse reactions cross-check#
openFDA text is shown for search and cross-checking; DailyMed SPL is canonical.
adverse reactions
ADVERSE REACTIONS The following adverse reactions have been observed, but there are insufficient data to support an estimate of their frequency. Autonomic Nervous System*: Postural hypotension, tachycardia, inhibition of ejaculation, nasal congestion, miosis. *These so-called “side effects” are actually evidence of adrenergic blockade and vary according to the degree of blockade. Miscellaneous: Gastrointestinal irritation, drowsiness, fatigue.
Reported adverse events (FAERS/openFDA)#
Adverse event summaries are temporarily unavailable. Other product information remains available.