Increased insulin requirements w/ corticosteroids, INH, lipid-lowering drugs (eg, niacin), estrogens, OCs, phenothiazines, thyroid replacement therapy. Decreased insulin requirements w/ oral hypoglycemics, salicylates, sulfa antibiotics, antidepressants (MAOIs), ACE inhibitors, β-adrenergic blockers, pancreatic function inhibitors (eg, octreotide), alcohol. Masked hypoglycemic symptoms w/ β-adrenergic blockers.