Certain medicines are especially likely to affect the amount of sugar in your blood: • steroids (used to treat inflammation) such as prednisolone or dexamethasone • beta-2-agonists (used to treat asthma), such as salbutamol or salmeterol • diuretics (used to get rid of water), such as furosemide or indapamide • ACE inhibitors (used to treat high blood pressure), such as enalapril or captopril • gemfibrozil (used to lower cholesterol) • rifampicin (used to treat tuberculosis and other infections) • cimetidine (used to reduce stomach acid).