In case of an overdose, patients should contact a physician, poison control center (1-800-222-1222), or emergency room.

The signs and symptoms of overdosage include: headache; nausea; vomiting; blurred vision; dilated pupils; hot, dry skin; dizziness; dryness of the mouth; difficulty in swallowing; and CNS stimulation including convulsion. A curare-like action may occur (i.e., neuromuscular blockade leading to muscular weakness and possible paralysis).

One reported event included a 37-year-old who reported numbness on the left side, cold fingertips, blurred vision, abdominal and flank pain, decreased appetite, dry mouth, and nervousness following ingestion of 320 mg daily (four 20 mg tablets four times daily). These events resolved after discontinuing the dicyclomine.

The acute oral LD50 of the drug is 625 mg/kg in mice.

The amount of drug in a single dose that is ordinarily associated with symptoms of overdosage or that is likely to be life-threatening, has not been defined. The maximum human oral dose recorded was 600 mg by mouth in a 10-month-old child and approximately 1500 mg in an adult, each of whom survived. In three of the infants who died following administration of dicyclomine hydrochloride [see WARNINGS AND PRECAUTIONS], the blood concentrations of drug were 200, 220, and 505 ng/mL.

It is not known if BENTYL is dialyzable.

Treatment should consist of gastric lavage, emetics, and activated charcoal. Sedatives (e.g., short-acting barbiturates, benzodiazepines) may be used for management of overt signs of excitement. If indicated, an appropriate parenteral cholinergic agent may be used as an antidote.

BENTYL is contraindicated in infants less than 6 months of age [see Use In Specific Populations], nursing mothers [see Use in Specific Populations], and in patients with:

• unstable cardiovascular status in acute hemorrhage
• myasthenia gravis [see WARNINGS AND PRECAUTIONS]
• glaucoma [see ADVERSE REACTIONS and DRUG INTERACTIONS]
• obstructive uropathy [see WARNINGS AND PRECAUTIONS]
• obstructive disease of the gastrointestinal tract [see WARNINGS AND PRECAUTIONS]
• severe ulcerative colitis [see WARNINGS AND PRECAUTIONS]
• reflux esophagitis

Last reviewed on RxList: 2/1/2013
This monograph has been modified to include the generic and brand name in many instances.