I use the medication for the relief of arthritis pain. I have also had an aorta valve replaced, and take medications for that, (Metoprolol Tartrate,Lisinopril,Digoxin-Lanoxin, Pravastatin, Potassium, Aspirin and Furosemide) yesterday I had to take a ua test and tested positive for cocain use. Never touched the stuff, can any of these medications cause that type of result?