Diltiazem with xanax. . . . suggest a possible drug interaction with alprazolam for the following: diltiazem . ) related to Cardizem (Diltiazem). From FDA and community: a study of Tarceva, Prilosec, Amaryl, Diltiazem, Macrobid, Atacand, Metformin Hcl, Synthroid, Simvastatin, Detrol, Indapamide, Vicodin, Xanax for . . It is used for the . Click on the relevant link below to view a . . 1 XANAX ® XR CIV (alprazolam) extended-release tablets DESCRIPTION XANAX XR Tablets . . Mfr: Not Specified, E... more