Effects of coadministration of corn oil and ponazuril on serum and cerebrospinal fluid concentrations of ponazuril in horses.

This study investigates whether using corn oil in conjunction with ponazuril, a treatment for equine protozoal myeloencephalitis (EPM), brings about higher concentration levels of ponazuril in the horse’s serum and cerebrospinal fluid. The authors conclude that the coadministration of corn oil does indeed result in higher ponazuril concentration and therefore might enhance the treatment’s effectiveness.

Objective and Method of Study

• The primary objective of this research was to investigate if coadministration of ponazuril and corn oil leads to higher concentration levels of the drug in the horse’s serum and cerebrospinal fluid (CSF) compared to that of ponazuril administration alone.
• The experiment design was a cohort study involving ten adult horses owned by the university. These horses were divided into two groups: one group was given a ponazuril treatment alone (PON group) and the other group received a combination of ponazuril and corn oil (PONOIL group), once daily for a period of 21 days.
• The serum and CSF of all the horses were collected on specific days (Days 0, 7, 14, and 21 for serum, and days 1, 7, 14, and 21 for CSF) and the concentration of ponazuril was determined and compared among the two groups using repeated-measures ANOVA.

Results

• Upon analyzing the ponazuril concentration in the serum of the horses, it was found that those in the PONOIL group had higher concentrations at a steady state (6.2 ± 0.9 mg/L) than those in the PON group (4.5 ± 1.0 mg/L), indicating that corn oil administration aids in increasing the serum concentration of ponazuril.
• Similar effects were observed in the CSF concentrations as well with the PONOIL group registering higher concentrations (0.213 mg/L ± 0.04) as opposed to the PON group (0.162 ± 0.04 mg/L).

Conclusion

• The findings of the study indicate that when ponazuril is coadministered with corn oil, the resulting concentrations of the drug in a horse’s serum and CSF are higher than when ponazuril is administered alone.
• This suggests that the use of corn oil could potentially enhance the effectiveness of ponazuril treatment for equine protozoal myeloencephalitis (EPM).