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Updated: Jul 21, 2026

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Published on: August 18, 2008
Interaction between phencyclidine (PCP) and GABA-ergic drugs: clinical implications
(-) Baclofen effectively antagonized phencyclidine (PCP)-induced hyperactivity in mice, suggesting its potential for managing PCP intoxication. This GABAergic agent also demonstrated anesthetic properties when combined with higher PCP doses.
Area of Science:
- Neuropharmacology
- GABAergic system research
Background:
- Phencyclidine (PCP) is a dissociative drug with stimulant effects.
- The role of the GABAergic system in mediating PCP's effects is not fully understood.
Purpose of the Study:
- To investigate the potential of GABAergic agents as antagonists to PCP's locomotor stimulant effects.
- To explore the anesthetic properties of (-) baclofen in conjunction with PCP.
Main Methods:
- Mice were pretreated with various GABAergic drugs, including (-) baclofen, before administering PCP or d-amphetamine.
- Locomotor activity was measured to assess the stimulant effects.
- Anesthetic responses (righting reflex, pain, corneal reflex) were evaluated at higher PCP doses with (-) baclofen pretreatment.
Main Results:
- (-) Baclofen demonstrated dose-dependent inhibition of PCP-induced locomotor stimulation, with its (+) isomer being inactive.
- Aminooxyacetic acid (AOAA) showed maximum blocking effects at 3 and 6 hours post-administration.
- Unlike d-amphetamine, PCP's stimulant effect was not significantly blocked by most tested GABAergic agents, except gamma-acetylenic GABA.
- Diazepam affected d-amphetamine response but not PCP-induced stimulation.
- Higher doses of PCP combined with (-) baclofen induced surgical anesthesia, with duration dependent on both drug dosages.
Conclusions:
- PCP's locomotor stimulant effects may involve GABA antagonism in specific brain regions.
- (-) Baclofen is a potent PCP antagonist and shows promise for treating PCP intoxication.
- (-) Baclofen may serve as a useful adjuvant for general anesthesia.
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