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Open Access Effect of Respiratory Tract Disease on Pharmacokinetics of Tilmicosin in Rats

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Background and Purpose: In rats, murine respiratory mycoplasmosis is caused by Mycoplasma pulmonis. Tilmicosin, a macrolide antibiotic, has good tissue penetration and reaches high concentration in the lungs. Therefore, a model for studying the effects of disease on pharmacokinetics of tilmicosin was developed, using LEW rats.

Methods: Seventy-two LEW rats were assigned at random to two groups: one group was inoculated with M. pulmonis, and the other served as an uninoculated control group. On postinoculation day 31, all rats received a single dose of tilmicosin (20 mg/kg of body weight, subcutaneously).

Results: Concentration of tilmicosin in the lungs of both groups of rats was significantly higher than serum tilmicosin concentration at all times. Infected rats had significantly higher lung tilmicosin concentration than did noninfected rats. No correlation was found between pH of the lungs and tilmicosin concentration in the lungs in either treatment group, nor did treatment have any effect on pH of the muscle.

Conclusion: Tilmicosin accumulates in the lungs, and infection/inflammation further improves its tissue penetration.

Document Type: Research Article

Publication date: 1999-06-01

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  • Comparative Medicine (CM), an international journal of comparative and experimental medicine, is the leading English-language publication in the field and is ranked by the Science Citation Index in the upper third of all scientific journals. The mission of CM is to disseminate high-quality, peer-reviewed information that expands biomedical knowledge and promotes human and animal health through the study of laboratory animal disease, animal models of disease, and basic biologic mechanisms related to disease in people and animals.

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