Glycopyrrolate + AtenololUnknown
Atenolol's bioavailability may be increased with coadministration of glycopyrrolate. A reduction in the atenolol dose may be needed. ( 7 ) • Atenolol or metformin: Glycopyrrolate may increase serum levels of atenolol or metformin.
Source: FDA drug label - glycopyrrolate