A MUCOSAL BIOADHESIVE SLOW RELEASE CARRIER COMPRISING AN ACTIVE PRINCIPLE AND DEVOID OF STARCH, LACTOSE, WHICH CAN RELEASE THE ACTIVE PRINCIPAL FOR A DURATION OF LONGER THAN 20 HOURS. THIS BIOADHESIVE CARRIER CONTAINS A DILUENT, AN ALKALI METAL ALKYLSULFATE, A BINDING AGENT, AT LEAST ONE BIOADHESIVE POLYMER AND AT LEAST ONE SUSTAINED RELEASE POLYMER, AS WELL AS A METHOD FOR ITS PREPARATION.