- Nonlinear pharmacokinetics of DQ-2556, a new 3-quaternary ammonium cephalosporin antibiotic, in rats caused by non-Michaelis-Menten type, dose-dependent renal clearance. Matsubayashi, K., Shintani, S., Yoshida, K., Yamada, M., Tachizawa, H. Journal of pharmaceutical sciences. (1994)