warnings
WARNINGS Patients to be treated with trihexyphenidyl should have a gonioscope evaluation and close monitoring of intraocular pressures at regular periodic intervals.
FDA label 3ec8b709-e7b1-25d1-e054-00144ff88e88
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
- 29c9122a-135d-461b-a833-0aa242288de3
- SPL ID
- 3ec8b709-e7b1-25d1-e054-00144ff88e88
- Version
- 2
- Effective date
- 2016-10-13
- Source export date
- 2026-09-28
- Source partition
- 8
- Source file
- https://download.open.fda.gov/drug/label/drug-label-0008-of-0014.json.zip
- Source object key
- raw/openfda/drug-label/2026-09-28/ae3816359e336a5de4f44607730a3d12ceb61ffa012a132189ceda22541b38ee/drug-label-0008-of-0014.json.zip
- Source manifest SHA-256
- cd2e66336a5cd2223fa3995098fdbdb84c6a7ee5c0a4addb236ccb22dd1e6887
- Import run
- 20260929T050834Z
- Imported at
- 2026-09-29 05:51:44
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 | 3ec8b709-e7b1-25d1-e054-00144ff88e88 | id | |
| spl set id | 29c9122a-135d-461b-a833-0aa242288de3 | 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 Isolated instances of suppurative parotitis secondary to excessive dryness of the mouth, skin rashes, dilatation of the colon, paralytic ileus, and certain psychiatric manifestations such as delusions and hallucinations, plus one doubtful case of paranoia all of which may occur with any of the atropine-like drugs, have been reported rarely with trihexyphenidyl. Patients with arteriosclerosis or with a history of idiosyncrasy to other drugs may exhibit reactions of mental confusion, agitation, disturbed behavior, or nausea and vomiting. Such patients should be allowed to develop a tolerance through the initial administration of a small dose and gradual increase in dose until an effective level is reached. If a severe reaction should occur, administration of the drug should be discontinued for a few days and then resumed at a lower dosage. Psychiatric disturbances can result from indiscriminate use (leading to overdosage) to sustain continued euphoria. Potential side effects associated with the use of any atropine-like drugs include constipation, drowsiness, urinary hesitancy or retention, tachycardia, dilation of the pupil, increased intraocular tension, weakness, vomiting, and headache. The occurrence of angle-closure glaucoma due to long-term treatment with trihexyphenidyl hydrochloride has been reported.
Reported adverse events (FAERS/openFDA)#
Adverse event summaries are temporarily unavailable. Other product information remains available.