Tabernanthalog

Tabernanthalog (TBG, DLX-007) is a synthetic, water-soluble analog of the indole alkaloid ibogaine, first reported by Cameron et al. in a 2020 publication in Nature from the Olson laboratory at the University of California, Davis. The compound was engineered through function-oriented synthesis to isolate the therapeutic pharmacophore of ibogaine while eliminating two liabilities that have prevented clinical development of the parent alkaloid: blockade of the human ether-a-go-go-related gene (hERG) potassium channel (the basis of ibogaine-associated QT prolongation and fatal cardiac arrhythmia) and activation of hallucinogenic signaling cascades downstream of the serotonin 5-HT2A receptor. Tabernanthalog retains the capacity to promote rapid, sustained structural neuroplasticity in cortical neurons, including dendritic arborization and spinogenesis in the prefrontal cortex, through activation of the 5-HT2A receptor and downstream TrkB, mTOR, and AMPA receptor signaling pathways. A 2025 publication in Nature Neuroscience by Aarrestad et al. demonstrated that tabernanthalog achieves this neuroplasticity without inducing the immediate glutamate burst or the immediate early gene (IEG) activation that characterize classical hallucinogenic psychedelics, establishing a dissociation between psychoplastogenic structural remodeling and the acute transcriptional programs previously considered prerequisite. In behavioral pharmacology, tabernanthalog does not produce the mouse head-twitch response, the standard behavioral proxy for hallucinogenic activity, confirming its non-hallucinogenic profile. Preclinical efficacy has been demonstrated across multiple disease-relevant models: a single dose reduces immobility in the forced swim test (antidepressant-like activity); a single dose restores functional neural circuits, including dendritic spine density and sensory processing, disrupted by unpredictable mild stress in mice (Lu et al., Molecular Psychiatry 2021); a single dose reduces heroin self-administration in rats and alcohol binge drinking in mice; and tabernanthalog reduces motivation for both heroin and alcohol in a polydrug use model with effects persisting up to 14 days after treatment (Heinsbroek et al., 2023). The molecular pharmacology of tabernanthalog extends beyond 5-HT2A partial agonism to include antagonism at the 5-HT2B receptor, agonism at 5-HT1B, 5-HT1F, 5-HT2C, and 5-HT6 receptors, inhibition of monoamine oxidase A, activity at the alpha-2A adrenergic receptor and the serotonin transporter, and inhibition of alpha-7 and alpha-9/alpha-10 nicotinic acetylcholine receptors at low-micromolar concentrations. The compound does not interact significantly with opioid receptors, the NMDA receptor, or the hERG potassium channel. Tabernanthalog is prepared in a single synthetic step from commercially available precursors, is freely water-soluble as the fumarate salt, and has a molecular weight of 230.31 g/mol (free base). Despite strong preclinical validation and assignment of the development code DLX-007 by Delix Therapeutics, the compound has not entered human clinical trials as of May 2026; the company's lead clinical candidate is the structurally related psychoplastogen zalsupindole (DLX-001). This monograph reviews the chemistry, synthesis, and structure-activity relationships of tabernanthalog; the multi-target molecular pharmacology in receptor-level and signaling-pathway detail; the available pharmacokinetic characterization; the preclinical efficacy data across depression, stress, addiction, pain, and cognitive models; the clinical development status; sourcing and quality verification considerations; reconstitution and handling; stack-interaction implications; the adverse-event and safety profile; and a comparative assessment of five alternative psychoplastogens and ibogaine analogs against tabernanthalog on five competency standards.