I am taking the following medications, and would like to know if any interactions may occur that would cause stiffness in my knees? Allopurinol 300mg 1xday, Atorvastatin 40mg 1xday, Warfarin 2.5mg 1xday, Sotalol Hcl 120mg 2xday, Diltiazem Er caps 120mg, 2xday. Thank you for your consideration!