Chewable tab 500 mg (white, round, 18mm, bevelled-edge, flat, debossed with 'S405/500' on one side) x 90's. 750 mg (white, round, 20mm, bevelled-edge, flat, debossed with 'S405/750' on one side) x 90's. 1,000 mg (white, round, 22mm, bevelled-edge, flat, debossed with 'S405/1000' on one side) x 90's.