The present invention provides a pharmaceutical composition, presented as asolid unit dosage form adapted fororal administration of sodium oxybate. The preferred unit dosage form is atablet comprising a relatively high weight-percentageof sodium oxybate, in combination with a relatively small weight-percentage oftotal excipients. This permits the tablets tocontain/deliver a pharmaceutically effective amount, e.g., about 0.5-1.5 g ofsodium oxybate in each tablet with a delivery profilesimilar to that of the liquid form. The tablets are bioequivalent to theliquid form.