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The aim of the study was to evaluate the incidence of chronic kidney disease (CKD) in patients with chronic back pain and nonsteroidal anti-inflammatory drugs (NSAIDs) intake not less than a year, and to study the interrelation between CKD, peculiarities of pain and its treatment. Material and Methods. 91 patients with axial spondyloarthri-tis — ax-SpA(ankylosing spondylitis and non-radiographic ax-SpA) and 35 patients with degenerative diseases of the spine (DDS) with NSADs intake not less than 1 year were involved in the study. The control group included healthy volunteers who did not took NSAIDs during the last year (n=51). By age, gender, factors of cardiovascular risk, GFR in patients with ax-SpA, DDS and controls were comparable. The activity of pain was evaluated according to the accepted recommendations. The index of NSAID intake as calculated for the preceding year. Results. GFR in patients with ax-SpAwas 87,0 [77,25; 102,0] ml/min/1,73 m2, 11 (18%) patients showed a reduction in GFR of less than 60 ml/ min/1,73m2. In patients with DDS GFR was 87,5 [65,5; 97,0] ml/min / 1,73 m 2 (p=0,27), decreased GFR of less than 60 ml/min / 1,73 m2 was detected in 3 (15%) patients. The ratio of albumin / creatinine urine in patients with ax-SpA was 35,8 [25,46; 43,4] mg/g, in patients DDS —207,1 [91,66; 244,59] mg/g (p

We studied the use ofnon-steroid anti-inflammatorydrugs (NSAID) at the in-patient department ofcentral district hospitalwith the application ofDDD-techniques before and after the formular system adoption. After introduction of drug formular and treatment standards the use of NSAID was reduced; the physicians began to use modern drugs. Non-indicated and contraindicated NSAID were prescribed more seldom. Itwas determined that reduction of antihypertensive drugs efficiency in hypertensive patients was the main side effect of NSAID use. NSAID gastropathy occurred more seldom, and mainly in the patients receiving several NSAIDs simultaneously.