Medications that affect ketosis include: Antibiotics, such as amoxicillin and ciprofloxacin Anticonvulsants, such as phenytoin and carbamazepine Anti-inflammatory drugs, such as ibuprofen and naproxen Antihistamines, such as diphenhydramine Beta-blockers, such as propranolol and metoprolol Calcium channel blockers, such as nifedipine and verapamil Corticosteroids, such as prednisone Diuretics, such as hydrochlorothiazide and furosemide Hormones, such as estrogen and testosterone Insulin Methyldopa Oral contraceptives, such as ethinyl estradiol and levonorgestrel Phenothiazines, such as chlorpromazine Steroids, such as prednisone and dexamethasone Thyroid medications, such as levothyroxine