Fresenius Kabi Simplist System Fresenius Kabi introduced Fentanyl Citrate Injection, USP 50 mcg per 1 mL in its Simplist ready-to-administer prefilled syringe, the only 1 mL presentation currently available in the U.S. The 50 mcg per 1 mL prefilled syringe is designed to support initiatives at hospitals nationwide to reduce waste and diversion and help ensure safe delivery of the medication by eliminating steps where errors can occur. Simplist Fentanyl ready-to-administer prefilled syringes ...