Copovidone-related Cutaneous Response in the Dog

Area of Science:

• Veterinary Toxicology
• Pharmaceutical Sciences
• Drug Formulation

Background:

• Cutaneous adverse reactions, including localized swelling and erythema, have been observed in canine toxicology studies.
• These responses occurred across multiple studies involving structurally unrelated test items administered orally using copovidone as a vehicle.
• The commonality across these studies, conducted between 2009 and 2015, was the use of a copovidone amorphous solid dispersion (ASD) formulation.

Purpose of the Study:

• To investigate the cause of unexpected cutaneous responses observed in dog toxicology studies.
• To identify the role of copovidone, specifically in its amorphous solid dispersion (ASD) form, in eliciting these skin reactions.
• To explore the potential involvement of histamine in the observed cutaneous changes.

Main Methods:

• Comparative analysis of toxicology studies utilizing copovidone ASD formulations versus non-ASD formulations of the same compounds.
• Examination of data from placebo (copovidone control) groups within these studies.
• Review of existing literature on the effects of polyvinylpyrrolidone, a component of copovidone, in canine models.

Main Results:

• Cutaneous responses were consistently noted in dogs receiving test items formulated with copovidone ASD.
• Similar reactions were absent when the same test items were administered in non-ASD formulations.
• Occasional cutaneous responses were also observed in dogs receiving placebo formulations containing only copovidone.
• Literature indicated that intravenous administration of polyvinylpyrrolidone can induce comparable findings in dogs.

Conclusions:

• Copovidone, particularly in its amorphous solid dispersion (ASD) form, is implicated as the likely cause of the observed cutaneous responses in dogs.
• The formulation excipient, rather than the active test compounds, appears responsible for the localized swelling and erythema.
• Further investigation into the mechanism, potentially involving histamine release, is warranted to fully understand these drug-induced skin reactions.