Frusemide 40mg tablet is indicated for the treatment of edema associated with heart failure or renal impairment, contraindicated in patients with anuria or severe electrolyte imbalances, may cause side effects such as dehydration, hypotension, and electrolyte disturbances, and can interact with other medications that affect renal function or electrolyte levels, such as NSAIDs and certain antihypertensives.