- PABA (para-aminobenzoic acid)PABA (para-aminobenzoic acid): Based on secondary sources, pirenzepine may interfere with exocrine pancreatic function and may decrease absorption of PABA. Based on a clinical trial, pirenzepine may decrease PABA serum levels (2698170).
- RiboflavinRiboflavin: Based on human evidence, anticholinergic drugs may affect riboflavin absorption (4636455, 4556316, 5059801, 5058638).
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