Mechanisms of Action and Change in Psychedelic-Assisted Therapies: A Holistic Framework for Ethical, Competent Clinical Care

Psychedelic-assisted therapies show promise for stress- and trauma-related conditions that have not responded well to existing treatments. Current explanations focusing on brain changes and neurotransmitter effects are insufficient to explain how healing occurs through preparation, altered states, relationships, meaning-making, and integration. The authors propose a multilevel framework that distinguishes mechanisms of action from mechanisms of change, describing how neuroplasticity, memory updating, relational processes, context, and meaning-making may interact to create time-limited windows for experiential relearning. Ethical considerations and the possibility of increased vulnerability when safeguards are inadequate are discussed, along with guidance for clinicians.

Study at a glance

Abstract

Psychedelic-assisted therapies (PATs) are emerging as novel combination treatments for selected stress- and trauma-related psychiatric conditions, particularly in cases where existing pharmacologic and psychotherapeutic approaches have provided limited benefit. Although current mechanistic models emphasize neuroplasticity, large-scale network changes, and modulation of neurotransmitter systems, these are insufficient to explain how therapeutic change emerges within the broader context of preparation, altered states of consciousness, interpersonal relationships, meaning-making, and integration. The authors introduce a non-neuroreductionist, multilevel framework that distinguishes mechanisms of action from mechanisms of change, highlighting how neuroplasticity, memory updating, relational processes, contextual factors, and meaning-making may interact to support therapeutic change. They draw on relevant evidence and clinical theory to describe how these treatments may create time-limited windows that support experiential relearning. Ethical considerations; limitations; and implications for practice, including the possibility that vulnerability may be increased when safeguards are inadequate, are discussed. Guidance is provided for clinicians who encounter PATs in practice.