Dexamethasone suppression tests are used to assess the status of the hypothalamic-pituitary-adrenal (HPA) axis and for the differential diagnosis of adrenal hyperfunction. The low-dose dexamethasone suppression tests are used to assess nonsuppressible cortisol production by adrenal incidentalomas and to differentiate patients with Cushing's syndrome of any cause from patients who do not have Cushing's syndrome. The high-dose dexamethasone suppression tests help to distinguish patients with Cushing's disease (Cushing's syndrome caused by pituitary hypersecretion of corticotropin [ACTH]) from most patients with the ectopic ACTH syndrome (Cushing's syndrome caused by nonpituitary ACTH-secreting tumors).
Tobramycin/dexamethasone ( INNs , trade name Tobradex , Tobrason in Jordan  ) is a prescription medication in the form of eye drops and eye ointment , marketed by Alcon . The active ingredients are tobramycin % (an antibiotic ) and dexamethasone % (a corticosteroid ). It is prescribed for a wide spectrum of bacterial eye infections. Tobradex can also be used to clear or contract styes that are also found in the eye. It is prescribed for the treatment of pink eye in combination with bacterial infections. Because it contains a steroid, careful use with gradual reduction of doses is required.