Related Experiment Video
Updated: Jun 11, 2026
A Conflict Model of Reward-seeking Behavior in Male Rats
Published on: February 20, 2019
Effects of methamphetamine on sexual performance and compulsive sex behavior in male rats
Karla S Frohmader1, Katherine L Bateman, Michael N Lehman
1Department of Anatomy & Cell Biology, University of Western Ontario, London, ON, Canada.
Rationale:
Methamphetamine (Meth) is a highly addictive psychostimulant associated with enhanced sexual desire, arousal, and sexual pleasure. Moreover, Meth abuse is frequently linked with the practice of sexual risk behavior and increased prevalence of human immunodeficiency virus. Currently, there is a lack of studies investigating the effects of Meth on maladaptive sexual behavior under controlled experimental settings in animal studies.
Objective:
The overall objective of the current study was to examine the effects of Meth on various aspects of male sexual behavior including maladaptive sex-seeking behavior.
Methods:
First, a dose-response curve of the effects of Meth (0, 1, 2, and 4 mg/kg; s.c.) on sexual motivation and performance was conducted in sexually naïve and experienced male rats. Next, the effects of Meth (1 mg/kg; s.c.) on inhibition of maladaptive sexual behavior was tested using a sex aversion conditioning paradigm, in which visceral illness induced by lithium chloride (LiCl) was paired with sexual behavior.
Results:
Meth administration inhibited sexual performance in a dose-dependent matter as evidenced by the decreased percentages of males that mated and increased latencies to initiate sexual behavior when injected with 2 or 4 mg/kg Meth. Moreover, an acute dose of Meth prior to or following sex aversion conditioning resulted in disrupted conditioned inhibition of sexual behavior.
Conclusions:
These data suggest that Meth administration in male rats impairs sexual motivation and performance. In addition, low doses of Meth that do not disrupt sexual function may result in maladaptive seeking of sexual behavior.
Insights
Methamphetamine impairs male rat sexual performance in a dose-dependent manner. Low doses may paradoxically increase maladaptive sex-seeking behaviors, highlighting risks associated with stimulant use.
Area of Science:
- Neuroscience
- Behavioral Pharmacology
Background:
- Methamphetamine (Meth) is a psychostimulant linked to increased sexual desire and risk behaviors.
- Meth abuse correlates with higher HIV prevalence.
- Limited research exists on Meth's effects on maladaptive sexual behavior in controlled animal studies.
Purpose of the Study:
- To investigate the impact of Meth on male rat sexual motivation and performance.
- To assess Meth's influence on maladaptive sex-seeking behavior.
Main Methods:
- A dose-response study (0-4 mg/kg) examined Meth's effects on sexual motivation and performance in male rats.
- A sex aversion conditioning paradigm tested Meth's (1 mg/kg) disruption of conditioned inhibition of sexual behavior.
Main Results:
- Meth impaired sexual performance dose-dependently, reducing mating success and increasing latency at higher doses (2-4 mg/kg).
- Meth disrupted the conditioned inhibition of sexual behavior when administered around conditioning trials.
Conclusions:
- Methamphetamine administration negatively impacts sexual motivation and performance in male rats.
- Low Meth doses, without overt performance impairment, may promote maladaptive sexual behavior.
Related Concept Videos
01:24CNS Stimulants: Cocaine, Amphetamines and Cannabinoids
01:15Drug Abuse and Addiction: Pharmacological Phenomena
01:23Drugs Acting on Autonomic Ganglia: Stimulants
Ganglionic stimulants activate NM nicotinic receptors in autonomic ganglia, falling into two categories: nicotine mimetics [e.g., lobeline, dimethylpiperazine, tetramethylammonium] and muscarinic receptor agonists [e.g., muscarine, methacholine]. The first category's action is rapid and blocked by nicotinic receptor antagonists, while the second category's action is delayed and blocked by atropine-like agents. Nicotine, an alkaloid, affects the heart rate by stimulating sympathetic or...
01:25Adrenergic Agonists: Indirect-Acting Agents
One mechanism involves depleting stored catecholamines by displacing them from synaptic vesicles. These agents, known as "displacers," are transported into vesicles at the expense of noradrenaline. Examples include amphetamine and tyramine, which lack a catechol moiety, resulting in prolonged action, improved oral bioavailability, and...