Alternative method of oral dosing for rats

Area of Science:

• Pharmacology
• Animal Models
• Drug Delivery

Background:

• Oral drug administration in rodents commonly uses gavage, which can cause esophageal injury and distress.
• Alternative methods are needed to reduce morbidity and distress associated with traditional gavage techniques.

Purpose of the Study:

• To evaluate syringe feeding as an alternative oral dosing method in rats.
• To compare the palatability and pharmacokinetics of donepezil and galantamine via syringe feeding versus gavage.
• To assess the impact of syringe feeding on cognitive performance in a novel object recognition test.

Main Methods:

• Male Lister hooded rats were administered donepezil, galantamine, or nicotine via syringe feeding or traditional gavage.
• Palatability was assessed by measuring voluntary intake from a syringe containing sucrose.
• Pharmacokinetic profiles and cognitive performance (novel object recognition test) were evaluated for each administration method.

Main Results:

• Rats readily learned to drink voluntarily from the syringe, with decreasing latency.
• Nicotine addition to sucrose resulted in aversive effects, inhibiting intake.
• Syringe feeding improved oral bioavailability of donepezil but not galantamine.
• Both donepezil and galantamine improved cognitive performance similarly across both administration methods.

Conclusions:

• Syringe feeding is a viable and effective alternative oral dosing method in rats.
• This technique can reduce distress and potential injury compared to gavage.
• Syringe feeding demonstrates potential for enhanced oral bioavailability of certain drugs and maintains therapeutic efficacy.