Dexamethasone tablets 0.5 mg are indicated for the treatment of inflammatory and autoimmune conditions, contraindicated in patients with systemic fungal infections or hypersensitivity to the drug, may cause side effects such as increased appetite, weight gain, and mood changes, and can interact with medications like nonsteroidal anti-inflammatory drugs (NSAIDs) and anticoagulants, potentially increasing the risk of gastrointestinal bleeding and altering blood clotting.