Before taking dexamethasone, tell your doctor or pharmacist if you are allergic to it; or to other corticosteroids (e.g., prednisone); or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details. The dosage and length of treatment are based on your medical condition and response to therapy. Your doctor may attempt to reduce your dose slowly from time to time to minimize side effects. Before using this medication, tell your doctor or pharmacist your medical history, especially of: infections (e.g., tuberculosis, herpes, fungal infections), kidney disease, liver disease, mental/mood conditions (e.g., psychosis, anxiety, depression), low blood minerals (e.g., low potassium/calcium), thyroid disease, stomach/intestinal problems (e.g., ulcer, ulcerative colitis, diverticulitis, unexplained diarrhea), high blood pressure, heart problems (e.g., congestive heart failure, recent heart attack), diabetes, eye diseases (e.g., cataracts, glaucoma, herpes infection of the eye), brittle bones (osteoporosis), history of blood clots. Do not stop taking this medication without consulting your doctor. Some conditions may become worse when this drug is suddenly stopped. Your dose may need to be gradually decreased.