Storage before Reconstitution: Vials of lyophilized antigen component: Store refrigerated between 36° and 46°F (2° and 8°C). Protect vials from light. Prefilled ungraduated syringes of sterile water diluent: Store refrigerated between 36° and 46°F (2° and 8°C) or at controlled room temperature up to 77°F (25°C). Do not freeze lyophilized antigen component or sterile water diluent. Storage after Reconstitution: Administer PRIORIX immediately after reconstitution. If not used immediately, store refrigerated between 36° and 46°F (2° and 8°C) and administer within 8 hours. Discard reconstituted vaccine if not used within 8 hours. Do not freeze. Discard if the reconstituted vaccine has been frozen.