Clients taking metformin (Glucophage) should be monitored for this rare but potentially fatal adverse effect:

Respiratory acidosis: This is not a typical side effect of metformin. B. Hyperlipidaemia: Metformin might not directly cause significant hyperlipidaemia. C. Hypertension: Metformin doesn't typically cause hypertension. D. Lactic acidosis: This is a rare but serious complication of metformin therapy. It can occur if metformin accumulates in the body due to impaired kidney function or other factors. Monitoring for signs and symptoms is crucial.