Some medicines can affect how trandolapril/verapamil works. Tell your doctor if you are using any of the following:Colchicine, cyclosporine, digitalis, digoxin, doxorubicin, everolimus, gold injection, ivabradine, lithium, ritonavir, sirolimus, St John's wort, sulfinpyrazone, tacrolimus, temsirolimus, or theophyllineAnother blood pressure medicine, including an angiotensin receptor blocker (ARB) or a beta-blockerDiuretic (water pill, including amiloride, spironolactone, triamterene)Insulin or oral diabetes medicine (including glyburide)Medicine for heart rhythm problems (including disopyramide, flecainide, quinidine)Medicine to lower cholesterol (including atorvastatin, lovastatin, simvastatin)Medicine to treat depression or sedatives (including almotriptan, buspirone, imipramine, midazolam)Medicine to treat infection (including clarithromycin, erythromycin, rifampin, telithromycin)Medicine to treat seizures (including carbamazepine, phenobarbital)NitratesNSAID pain medicine (including aspirin, celecoxib, diclofenac, ibuprofen, naproxen)