Formulation pH has been reported to be responsible for the incidence o
f phlebitis. In this study, the effect of pH on injection phlebitis is
investigated. Buffers of varying pHs were examined for their ability
to produce phlebitis in rabbits, Thermal measurements as well as visua
l evaluations were used for phlebitis quantitation. The results show t
hat formulation pH between 3.0 and 11.0 does not contribute to the inc
idence of phlebitis when administered as an iv bolus injection.