Benztropine and Diphenoxylate and atropine interaction
Benztropine and Diphenoxylate and atropine: both prescribing labels flag this combination with the strongest language, such as a contraindication, a boxed warning, or an instruction to avoid it.
Do not combine without a prescriber's guidance. The label language below is the strongest FDA uses.
What the FDA labels say
From the Benztropine (BENZTROPINE MESYLATE) label · effective 2026-02-16
Because of its atropine-like side effects, this drug is contraindicated in pediatric patients under three years of age, and should be used with caution in older pediatric patients.
For this reason, it should be administered with caution during hot weather, especially when given concomitantly with other atropine-like drugs to the chronically ill, the alcoholic, those who have central nervous system disease, and those who do manual labor in a hot environment.
Since benztropine mesylate contains structural features of atropine, it may produce anhidrosis.
From the Diphenoxylate and atropine (Diphenoxylate Hydrochloride and Atropine Sulfate) label · effective 2026-02-23
Clinical presentations vary in terms of which toxicity (anticholinergic vs. opioid) will present first or predominate; non-specific findings have been reported and include symptoms such as drowsiness (see OVERDOSAGE ).
Anticholinergic and Opioid-Toxicities Toxicities associated with the atropine and diphenoxylate components of diphenoxylate hydrochloride and atropine sulfate have been reported.
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Open in the checkerNot medical advice. Interaction Checker quotes FDA label text and NIH fact sheets. Whether an interaction matters for you depends on doses, timing, kidney and liver function, and other conditions. Confirm with a pharmacist or prescriber.