Objective: To compare pharmacokinetics and safety of recombinant human hyaluronidase (rHuPH20)-facilitated subcutaneous (SC) ceftriaxone administration versus SC ceftriaxone preceded by SC saline placebo or intravenous (IV) ceftriaxone administration.
Research design and methods: This Phase I, two-part, placebo-controlled, crossover study was conducted in 54 healthy volunteers. In Part 1 (N = 24), subjects received 1 mL rHuPH20 (150 USP units) or placebo (0.9% sodium chloride) SC, followed by 1 or 2 g ceftriaxone (10-350 mg/mL). In Part 2 (N = 30), subjects received 1 g ceftriaxone at the Part 1 maximum tolerated concentration (MTC) administered either SC - preceded by SC rHuPH20 or placebo - or IV. Subjects were monitored for adverse events (AEs); blood samples were obtained (Part 2 only) during 48 hours post-dosing for ceftriaxone bioanalysis.
Main outcome measures: Part 1 primary endpoint was the SC ceftriaxone (with or without rHuPH20) MTC. Pharmacokinetic parameters were determined in Part 2. Bioequivalence was based on maximum concentration (C(max)) and area under plasma concentration-time curve (AUC).
Results: The highest SC ceftriaxone concentration tested in Part 1 (350 mg/mL) was selected as the Part 2 MTC. In Part 2, median time to maximum concentration (t(max)) was 1 hour earlier (P < 0.0001), and C(max) was 12% higher (P < 0.0001) for ceftriaxone (350 mg/mL) administered via rHuPH20-facilitated SC versus SC preceded by placebo. IV ceftriaxone led to higher C(max) and shorter t(max) values than either SC treatment. Ceftriaxone exposure (AUC) was comparable among all three treatments. At least 1 AE was experienced by 100% of subjects after SC ceftriaxone and 76% after IV; most commonly reported AEs were infusion-site reactions.
Conclusions: Ceftriaxone AUC did not differ significantly between the three administration routes. C(max) was higher and t(max) shorter with rHuPH20-facilitated SC than SC preceded by placebo. rHuPH20-facilitated SC ceftriaxone was generally well tolerated. This study is limited by evaluation of healthy adults and absence of repeated-dose groups.