AZM pharmacokinetics in dogs were characterised by a long
half-life and slow clearance. Skin tissue concentrations were significantly
higher than serum concentrations and the ratio increased
further in the inflamed skin. Henderson–Hasselbalch equations
relating to the plasma and skin pH and the effect on AZM dissociation
in those matrixes cannot explain the increased AZM skin concentrations
in the inflamed skin. The increased skin concentration
in pyoderma may be advantageous therapeutically. The experimental
in vivo data obtained in this study is valuable in planning
future clinical trials and in establishing an ad hoc dose regimen.
A once daily 10 mg/kg dose during three consecutive days weekly
may be suitable for treatment of pyoderma in dogs.