Dear Sir, My dad (60 yrs) is suffering from Anklosing Spondylitis for 25 years, and have been using Microcid 25 mg ( 2 tab ) in morning & 2 tab in night ( 100 mg per day ) for 25 yrs. Recently for the last 2 years, we added K-Link product ( K-Artis ) to reduce his pain. Now, we have found that his kidney is shrunk and urea ( 40) , creatinine (1.4) value is in border . 1.Will the renal failure is due to microcid? 2. Can we try using microcid for one week to check if urea & Sr. Creatinine increases or is stable? Please advice