Pancreatic transplantation is an established treatment for patients wi
th insulin-dependent diabetes mellitus. Side-effects are mainly relate
d to surgical complications, immunosuppressive therapy and graft rejec
tion. We report on two patients having recurrent hypoglycaemic events
following pancreatic transplantation. The cause of hypoglycaemia in ou
r patients remained obscure. Hypoglycaemia following pancreatic transp
lantation has been described. Hypoglycaemic events may appear years af
ter transplantation. In the article we review three possible mechanism
s of hypoglycaemia: hyperinsulinaemia, secondary to systemic drainage
(due to loss of first pass hepatic insulin clearance), presence of ant
iinsulin antibodies and persistence of counter-regulatory abnormalitie
s. Physicians and patients should be aware of possible hypoglycaemia e
vents following transplantation.