From bugs to behavior: targeting the gut-brain interface for addiction therapeutics

Oct 28, 2025Gut microbes

Targeting the Gut-Brain Connection to Treat Addiction

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Gut-Brain Axis on OpenScience ↗PubMed ↗DOI ↗OA ↗

Abstract

Substance use disorders are influenced by gut microbial communities and their metabolites.

Gut microbiota and their metabolites may play a role in the communication between the gut and the brain.
Microbial communities can modulate the brain's reward system and the metabolism of addictive substances.
Certain microbial-derived compounds, like short-chain fatty acids and neurotransmitters, could reinforce compulsive drug-seeking behaviors.
Chronic use of substances may lead to changes in gut microbiota composition and damage to the intestinal barrier.
This dysregulation may create a cycle that perpetuates addiction.
Targeted interventions, such as probiotics and dietary changes, may help restore gut-brain balance and reduce relapse.

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Substance use disorders involving alcohol, cocaine, tobacco, opioids, and methamphetamine represent a significant global health burden, driven by the dysregulation of neurobiological and metabolic pathways in addiction. Emerging research highlights the gut-brain axis (GBA) as a critical mediator of addictive behaviors, with gut microbiota and their metabolites influencing bidirectional communication between the gastrointestinal tract and the central nervous system. This review synthesizes current evidence on how gut microbial communities modulate the brain's reward circuitry and the metabolism of addictive substances, thereby shaping behavioral and physiological responses to substance use. We explore the mechanistic interplay between microbial-derived metabolites (short-chain fatty acids, neurotransmitters) and host neuroimmune signaling, which may reinforce compulsive drug-seeking behaviors. Additionally, we discuss how chronic substance exposure alters gut microbiota composition and intestinal barrier integrity, perpetuating a vicious cycle of addiction. By reframing addiction through the lens of the GBA, this review highlights the therapeutic potential of microbiota-targeted interventions, such as probiotics, prebiotics, and dietary modulation, to restore gut-brain homeostasis and mitigate relapse. These insights advocate for a paradigm shift in understanding addiction as a systemic disorder, offering novel avenues for biomarker discovery and personalized treatment strategies. e.g.,