XR........FORTAMET. Not prescribed as yet in the UK. Not in the current BNF.
FORTAMET is a once-daily 1000 mg extended-release metformin tablet for patients with type 2 diabetes. The extended release delivery allows for consistent therapeutic drug levels resulting in effective blood sugar control in many patients with type 2 diabetes. Indicated for use by adults 17 years of age and older, FORTAMET extended-release tablets can be used either as monotherapy or in combination therapy taken once daily. FORTAMET should be taken as an adjunct to diet and exercise to lower blood glucose for patients with type 2 diabetes.
SR is also slow release or is also known as modified release. This is usually once daily but can be given on a split daily dose.