PENSULIN SR is an analogue of insulin protamine reaction with a molecular weight of 6,500–7,500. It is a hyperglycosylated B-chain from insulin obtained from the bacteria Saccharomyces cerevisiae strain T234 (B-chain or B-type insulin). The mechanism of action is due to the formation of the drug by acid hydrolysis, which can be administered subcutaneously, intravenously or aerosolized. The duration of action of the drug after subcutaneous administration is 4-8 hours, and the pharmacokinetics