Pharmacology of the psychedelics

SubstanceMechanism of actionPharmacokinetics
PsilocybinMetabolized in the body to psilocin, which primarily binds to serotonin receptors (5-HT2A) in the brainDose-independent
Bioavailability: 50–70% (oral)
Onset of action: 20–30 minutes
Time to peak plasma concentration: 2–3 hours
Half-life: 1.5–3 hours (psilocin)
Duration of action: 2–6 hours
LSDBinds primarily to serotonin receptors (5-HT2A) in the brainDose-dependent
Bioavailability: 70–72% (oral)
Onset of action: 60 minutes
Time to peak plasma concentration: 30 minutes
Half-life: 3–4 hours
Duration of action: 6–12 hours
MDMAIncreases serotonin, dopamine, and norepinephrine levels in the brain by inhibiting their reuptakeDose-dependent
Onset of action: 30–60 minutes
Time to peak plasma concentration: 2 hours
Half-life: 8–9 hours
Duration of action: 6–12 hours
MescalineBinds to serotonin receptors (5-HT2A) and dopamine receptorsDose-dependent
Onset of action: 30 minutes
Time to peak plasma concentration: 2 hours
Half-life: 6 hours
Duration of action: 10–12 hours

LSD: lysergic acid diethylamide; MDMA: 3,4-methylenedioxymethamphetamine