Importance of Timing of Preprandial Subcutaneous Insulin Administration in the Management of Diabetes Mellitus

Since little is known regarding the appropriate time for preprandial insulin administration, we compared the effects of 30-min subcutaneous insulin infusions started 60 min, 30 min, and immediately before meal ingestion on postprandial plasma glucose and insulin profiles in eight subjects with insulin-dependent diabetes mellitus. Of these three regimens, administration of insulin 60 min before meal ingestion provided plasma glucose and insulin profiles closest to normal and permitted less insulin to be used. Our results suggest that adjustments in the timing as well as in the amount of insulin administered preprandially may be used in the management of diabetes and that prolonging the interval between administration of insulin and meal ingestion may reduce insulin requirements and thus decrease the hyperinsulinemia usually associated with insulin therapy.

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