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A slow-release silicone pellet for chronic amphetamine administration
European Journal of Pharmacology
|October 1, 1977
Summary
A novel slow-release amphetamine pellet provides sustained drug delivery for over 10 days in rats. This tool enables research into the long-term behavioral and physiological impacts of amphetamine intoxication.
Area of Science:
- Pharmacology
- Neuroscience
- Animal Models
Background:
- Amphetamine is a widely studied stimulant.
- Understanding prolonged amphetamine effects requires sustained drug delivery models.
Purpose of the Study:
- To describe a novel slow-release amphetamine pellet for sustained drug delivery.
- To evaluate the pharmacokinetic and behavioral effects of this pellet in rats.
Main Methods:
- Development of a silicone capsule pellet containing d-amphetamine base in polyethylene glycol.
- Subcutaneous implantation of pellets in rats.
- Measurement of brain amphetamine levels over time.
- Assessment of motor activity and behavioral responses using stabilimeters.
Main Results:
- Pellets achieved brain amphetamine levels comparable to acute dosing, sustained for over 10 days.
- Sustained motor stereotypies and hyperactivity observed for 2-3 days post-implantation.
- Exaggerated startle responses and handling resistance noted in later stages despite detectable brain amphetamine.
Conclusions:
- The slow-release amphetamine pellet offers a unique tool for studying prolonged amphetamine intoxication.
- This model allows for investigation of long-term behavioral and physiological consequences of sustained amphetamine exposure.