warnings
WARNING 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 0303dcbd-d777-4440-967d-39815299f065
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
- 02c70c23-b644-430c-b524-29af3360436d
- SPL ID
- 0303dcbd-d777-4440-967d-39815299f065
- Version
- 5
- Effective date
- 2021-01-26
- Source export date
- 2026-10-12
- Source partition
- 12
- Source file
- https://download.open.fda.gov/drug/label/drug-label-0012-of-0014.json.zip
- Source object key
- raw/openfda/drug-label/2026-10-12/edd23646015c9adc800cdbe2b778398a2d2b70e90dce5721ef2b191499a0397f/drug-label-0012-of-0014.json.zip
- Source manifest SHA-256
- 7e6b178df8f32cac9a78e0f5d09c588344509b04fe41effb1dde9102e2a45be6
- Import run
- 20261013T011858Z
- Imported at
- 2026-10-13 02:51:06
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 | 0303dcbd-d777-4440-967d-39815299f065 | id | |
| spl set id | 02c70c23-b644-430c-b524-29af3360436d | 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. To report SUSPECTED ADVERSE REACTIONS, contact Validus Pharmaceuticals LLC at 1-866-982-5438 (1-866-9VALIDUS) or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch.
Reported adverse events (FAERS/openFDA)#
Adverse event summaries are temporarily unavailable. Other product information remains available.