warnings
WARNINGS Do not exceed recommended dose. Methenamine may combine with sulfonamides in the urine to give mutual antagonism and should not be used with sulfonamides.
FDA label f357550a-7880-4300-b992-a9dd56d03750
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
- d8e5364a-ac4c-4715-979b-21c9f535d12c
- SPL ID
- f357550a-7880-4300-b992-a9dd56d03750
- Version
- 2
- Effective date
- 2020-05-31
- Source export date
- 2026-10-12
- Source partition
- 4
- Source file
- https://download.open.fda.gov/drug/label/drug-label-0004-of-0014.json.zip
- Source object key
- raw/openfda/drug-label/2026-10-12/b939c18fdf51df171cf60ce5558819d08ac66bb16bb9991d48cbec91028d783e/drug-label-0004-of-0014.json.zip
- Source manifest SHA-256
- 7e6b178df8f32cac9a78e0f5d09c588344509b04fe41effb1dde9102e2a45be6
- Import run
- 20261013T011858Z
- Imported at
- 2026-10-13 01:35:40
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 | f357550a-7880-4300-b992-a9dd56d03750 | id | |
| spl set id | d8e5364a-ac4c-4715-979b-21c9f535d12c | 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 Prolonged use may result in a generalized skin rash, pronounced dryness of the mouth, flushing, difficulty in initiating micturition, rapid pulse, dizziness or blurring of vision. If any of these reactions occurs, discontinue use immediately. Acute urinary retention may be precipitated in prostatic hypertrophy. See “OVERDOSE”.
Reported adverse events (FAERS/openFDA)#
Adverse event summaries are temporarily unavailable. Other product information remains available.