The document evaluates the therapeutic response of metformin HCl alone and in combination with other drugs on glycemic control in diabetic patients. It describes a retrospective and prospective study conducted at TTD Central Hospital and SVIMS involving 320 type 1 and type 2 diabetic patients between October 2006 and March 2007. The study assessed glycemic values, adverse drug reactions, diabetic complications, and demographic data to evaluate the effectiveness of different treatment regimens including metformin alone or in combination with other drugs like glibenclamide, glipizide, pioglitazone, and acarbose. The results showed that combination therapies were more effective at improving glycemic control and had better tolerability compared to individual drugs.