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Schematic representation of mechanism of floatation and drug release: A floating elementary osmotic pump tablet (FEOPT) containing elementary osmotic pump tablet (EOPT), gas-generating layer, and polymeric film; B CO2 gas bubbles formation due to chemical reaction between sodium bicarbonate and SGF (within gas-generating layer) caused floatation of FEOPT; and C movement of gas bubbles in upward direction and descending of EOPT within FEOPT
