Overview
Dexamethasone is a highly potent, long-acting synthetic glucocorticoid with pronounced anti-inflammatory and immunosuppressive properties. It is widely used to treat a variety of severe inflammatory, allergic, and autoimmune conditions, as well as certain types of cancer and cerebral edema.

Mechanism of Action
It binds to intracellular glucocorticoid receptors, altering gene expression to suppress the production of inflammatory mediators (such as cytokines and prostaglandins) and inhibit the immune response. It lacks significant mineralocorticoid activity, meaning it does not cause notable sodium and water retention.

Dosage and Administration
Dosage is highly variable and depends entirely on the specific condition being treated. It can be administered orally, intravenously, intramuscularly, or topically. The dose must be carefully titrated to the lowest effective level and gradually tapered off if used for prolonged periods.

Side Effects
Short-term use is generally well-tolerated but may cause insomnia, mood changes, and increased appetite. Long-term systemic use can lead to serious complications, including Cushing’s syndrome, osteoporosis, immunosuppression, hyperglycemia, hypertension, muscle wasting, and adrenal suppression.

Contraindications
It is contraindicated in patients with systemic fungal infections and those with a known hypersensitivity to the drug. Caution is required in patients with peptic ulcer disease, osteoporosis, psychiatric disorders, and poorly controlled diabetes mellitus.

Pregnancy and Lactation
It should be used during pregnancy only if the potential benefit justifies the potential risk to the fetus, as it can cross the placenta. Short courses are sometimes used to promote fetal lung maturation in anticipated preterm delivery. It may be excreted in breast milk.