Do not take w/ gemfibrozil or clopidogrel. Body's response to NovoNorm may change w/ MAOIs; β-blockers; ACE inhibitors; salicylates (eg, aspirin); octreotide; NSAIDs; steroids (anabolic & corticosteroids); OCs; thiazides; danazol; thyroid products; sympathomimetics; clarithromycin, trimethoprim, rifampicin; itraconazole, ketoconazole; ciclosporin; deferasirox; phenytoin, carbamazepine, phenobarb; St. John's wort.