The purpose of research is to assess adverse drug reactions, which were registered in Volgograd region, using spontaneous reports. Retrospectively notice cards of suspected adverse drug reactions received by the Volgograd regional center of drugs safety monitoring during 2010 and 2011 were analyzed. Evaluation of reliability of causal relationship «Drug— Adverse Drug Reaction» was carried out in accordance with Naranjo algorithm. In 2011 the volume of registered side effects grew almost 3 times by increasing the activity of doctors than in 2010. We defined the structure of drugs, which caused adverse reactions the most frequently. During these two years doctors rarely reported about adverse drug reactions of type A, so we can suppose that doctors had troubles with detecting causal relationship « Drug —Adverse Drug Reaction».