The following Venn diagram attempts to organize and provide a basic overview of the most common psychoactive drugs into intersecting groups and subgroups based upon pharmacological classification and method of action.[1][2]
Items within each subgroup are close to those of most similar action, and also follow a general placement in accordance with the legend below the diagram. Primary intersections are represented via color mixing.
Blue: Stimulants generally increase in potency to the upper left.
Red: Depressants generally increase in potency to the lower right.
Green: "Hallucinogens" are psychedelic to the left, dissociative to the right, generally less predictable down and to the right, and generally more potent towards the bottom.
Pink: Antipsychotics are generally more sedative/tranquilizing to the right.
Light-pink: Center overlap of all four sections (Stimulants, Depressants, Hallucinogens and Antipsychotics) - Cannabis, containing both THC and CBD exhibits a mix of all sections, leaning towards the hallucinogen section due to THC being the primary constituent.