INFLUENCE OF HYDRATED SODIUM CALCIUM ALUMINOSILICATE AND ACTIVATED CHARCOAL ON THE PHARMACOKINETICS OF SINGLE PULSE DOSING OF ENROFLOXACIN IN BROILER CHICKEN
Objective: The present study was undertaken to evaluate the interaction kinetics of enrofloxacin, the commonly used antibacterial in poultry with
mycotoxin binders namely hydrated sodium calcium aluminosilicate (HSCAS) and activated charcoal (AC), which have become inevitable components
of poultry feed.
Methods: Control group received normal feed free of toxin binder, whereas HSCAS and AC group were supplemented with HSCAS and AC at 0.5% in
feed, respectively. Enrofloxacin was administered as single pulse dose (at 10 mg/kg) through drinking water to all the groups. Blood samples were
collected at predetermined time intervals after drug administration, and plasma was separated and analyzed for enrofloxacin concentrations using
high-performance liquid chromatography.
Results: Significant decrease in area under the plasma concentration-time curve (AUC
was noticed in AC group when compared to control group
(13.90Â±1.15 vs. 19.67Â±1.68 mg.h/ml), whereas HSCAS group (16.42Â±1.24 mg.h/ml) neither differed significantly from AC nor control group. The
volume of distribution and clearance were significantly high in AC group when compared to control group (8.31Â±0.89 vs. 6.39Â±0.13 l/kg; 0.77Â±0.07 vs.
0.53Â±0.05 l/h/kg). HSCAS group was intermediate and did not differ significantly from the other two groups (8.13Â±0.45 l/kg; 0.63Â±0.04 l/h/kg).
However, volume of distribution at steady state was significantly high in both AC (10.42Â±1.09 l/kg) and HSCAS group (9.45Â±0.48 l/kg) when compared
to control group (7.21Â±0.20 l/kg). Maximum plasma concentration
was significantly low (0.99Â±0.04, 0.97Â±0.06, 1.38Â±0.04 mg/ml) and time to reach
maximum plasma concentration was significantly delayed (7.33Â±0.42, 6.67Â±0.67, 4.33Â±0.67 h) in AC and HSCAS group when compared to control
group, respectively. The relative bioavailability was significantly low in both AC and HSCAS group (74.95Â±10.70, 88.88Â±15.03%) when compared
to control group. Pharmacokinetic/pharmacodynamic integration revealed that the dose of enrofloxacin (10 mg/kg) was capable of treating only
moderately sensitive organisms (minimum inhibitory concentration â‰¤0.125 mg/ml) both in the presence and absence of toxin binder and higher
dosage is needed for the less sensitive organism.
Conclusion: The study revealed that the administration of enrofloxacin to HSCAS and AC supplemented broilers would lead to decrease in clinical
efficacy and promote the development of antimicrobial resistance. AC was found to interact more with enrofloxacin than HSCAS as observed from
the PK parameters. Hence, careful adjustment of dosage or withdrawal of the usage of toxin binder containing either HSCAS or AC in feed during
enrofloxacin treatment is recommended.
Keywords: Enrofloxacin, Pulse dosing, Hydrated sodium calcium aluminosilicate, Activated charcoal, Interaction kinetics.
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