Multiple unit effervescent dosage form

An effervescent dosage form comprising, as a first component, effervescent excipients and as a separate second component, a plurality of individual units comprising a pharmaceutically active compound selected from the group consisting of a proton pump inhibitor and a beta blocking agent and optionally pharmaceutically acceptable excipients wherein each unit is provided with a floating generating system comprising at least two coating layers, one of which is a gas generating layer and the other layer is a barrier layer enclosing the generated gas, and wherein the first component is separated from the second component by the layers of the floating generating system.