There are described delivery devices for insertion into a body cavity of a target mammal, the delivery device comprising a resilient frame adapted to receive one or more moulded impregnated masses. The frame, together with the impregnated mass, are insertable, retainable and withdrawable from the intended body cavity. The impregnated mass or masses are attached to the frame to present substantially all of each face of the masses to exposure to a fluid of the body cavity when retained therein.