We observed 3 diabetic patients,vith intolerable dizziness followed by
nausea and vomiting immediately after an initial administration of th
e alpha-glucosidase inhibitor, voglibose, These symptoms did not recur
after discontinuation of the drug. Adverse effects as observed in the
se cases have not been reported previously. Since the 3 patients were
relatively old (average age, 72 years old) and had various degrees of
micro- and macroangiopathies, these side effects may have been associa
ted with increased micro- and macrocirculatory disturbances in their c
entral nervous systems through alpha-glucosidase inhibition of this ag
ent.