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==Pharmacokinetic Considerations==
 
==Pharmacokinetic Considerations==
 
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Dihydrofolate reductase inhibitors: Lipophilic weak bases. 
 
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• Orally active. 
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• Widely distributed throughout the body, ion trapped in acidic fluids. 
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• Cleared by hepatic metabolism – rate varies with species and individual drug (trimethoprim rapidly metabolised by most veterinary species).
    
==Side Effects and Contraindications==
 
==Side Effects and Contraindications==
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