Diamet: 500 mg 3 times daily or 850 mg twice daily, with maximum daily dose not exceeding 2.5 g/day, with or after meals, gradually increased if necessary to a maximum of 3 g/day.
Diamet SR: 1000 mg once daily with the evening meal, although 500 mg may be utilised when clinically appropriate. Dosage increases should be made in 500-mg increments weekly, up to a maximum of 2500 mg once daily with the evening meal.