Proscaline

Proscaline, or 4-propoxy-3,5-dimethoxyphenethylamine, is a synthetic psychedelic in the mescaline-derived scaline family. It is the 4-propoxy analogue of mescaline and is structurally related to escaline and allylescaline. Laboratory studies have confirmed activity at serotonin 5-HT_2A receptors, while information about its human effects remains largely anecdotal.

Chemistry and relationship to mescaline

Proscaline retains the 3,5-dimethoxyphenethylamine structure of mescaline, but has a propoxy group at the 4-position of the aromatic ring. It is the phenethylamine counterpart of 3C-P, which has an additional alpha-methyl group on the side chain.

Proscaline belongs to the scaline series, in which the size and structure of the 4-alkoxy substituent vary. Escaline has an ethoxy group, while proscaline has a propoxy group. These changes can affect receptor interactions and the reported psychedelic profile.

Pharmacology

A 2022 in-vitro study found that proscaline binds to the 5-HT_2A receptor and acts as an agonist in the functional assay. The same research examined related scalines and found that longer 4-alkoxy substituents generally increased affinity and activation potency at 5-HT_2A and 5-HT_2C receptors (Kolaczynska and colleagues, 2022).

A mouse head-twitch study also compared proscaline with mescaline and other analogues. Proscaline produced a 5-HT_2A-mediated behavioural response, supporting its classification as a serotonergic psychedelic. Animal responses cannot be used as a direct measure of human subjective intensity (Mescaline analogue head-twitch study, 2019).

Subjective effects

The PsychonautWiki profile of proscaline and historical descriptions provide most of the available information about its subjective effects. Users compare it with mescaline, but the evidence is too limited to establish either a consistent experience or a reliable comparison of intensity.

Visual and cognitive effects

Reports mention visual patterning, changes in colour and depth perception, introspection and altered thought associations. Some accounts describe emotional shifts and changes in the perception of time. These descriptions are anecdotal and vary between individuals.

Physical effects

Reported physical effects include stimulation, nausea, muscle tension and changes in heart rate. The frequency and severity of these reactions have not been established through controlled human observations.

Toxicity and research limitations

Proscaline has not been examined in a substantial clinical toxicology programme. Its receptor activity and animal behavioural effects are better documented than its metabolism, acute toxicity or long-term effects in people. There are no controlled studies that establish dependence potential.

The pharmacology of proscaline should not be inferred solely from mescaline or 3C-P. The alpha-methyl group in 3C-P changes the chemical structure, while the longer propoxy substituent distinguishes proscaline from other scalines.

Related compounds

Proscaline is related to Escaline, Allylescaline, Methallylescaline and 3C-P. It is the 4-propoxy analogue of mescaline and the non-alpha-methyl counterpart of 3C-P.