warnings
WARNINGS Large doses of methenamine (8 grams daily for 3 to 4 weeks) have caused bladder irritation, painful and frequent micturition, albuminuria, and gross hematuria.
FDA label 4ea002b4-0da9-40c9-b1cd-36c29b156d5f
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
- 4d649196-b7b4-4d49-a905-80d07bc49f97
- SPL ID
- 4ea002b4-0da9-40c9-b1cd-36c29b156d5f
- Version
- 2
- Effective date
- 2014-03-24
- Source export date
- 2026-10-12
- Source partition
- 13
- Source file
- https://download.open.fda.gov/drug/label/drug-label-0013-of-0014.json.zip
- Source object key
- raw/openfda/drug-label/2026-10-12/b8dac220ac9fc8ffb4d86c6e00ece30169fc4575ca0cc92e5c9ce1a524fb0249/drug-label-0013-of-0014.json.zip
- Source manifest SHA-256
- 7e6b178df8f32cac9a78e0f5d09c588344509b04fe41effb1dde9102e2a45be6
- Import run
- 20261013T011858Z
- Imported at
- 2026-10-13 03:02:08
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 | 4ea002b4-0da9-40c9-b1cd-36c29b156d5f | id | |
| spl set id | 4d649196-b7b4-4d49-a905-80d07bc49f97 | 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 Minor adverse reactions have been reported in less than 3.5% of patients treated. These reactions have included nausea, upset stomach, dysuria, and rash.
Reported adverse events (FAERS/openFDA)#
Adverse event summaries are temporarily unavailable. Other product information remains available.