It was tested in T1DM and T2DM patients on antidiabetic medications, but no additional reduction in blood glucose levels was observed.60 The antiarrhythmic drug verapamil reduced the apparent Km for the (presumed) SGLT1–mediated uptake of D‐galactose by rabbit jejunum in vitro. Here, SLC5A1 is linked to type 1 diabetes mellitus.