2C-T (or 4-methylthio-2,5-DMPEA) is a psychedelic and hallucinogenic drug of the 2C family. It is used by some as an entheogen. It has structural and pharmacodynamic properties similar to the drugs mescaline and 2C-T-2.

It was first synthesized and studied through a collaboration between David E. Nichols and Alexander Shulgin.

2C-T is in a class of compounds commonly known as phenethylamines, and is the 4-methylthio analogue of 2C-O, a positional isomer of mescaline. It is also the 2C analog of Aleph. The full name of the chemical is 2-(2,5-dimethoxy-4-(methylthio)phenyl)ethanamine. The CAS number of 2C-T is 61638-09-3.

2C-T's active dosage is around 75-150 mg and produces mescaline and MDMA-like effects that may last up to 6 hours.

The mechanism that produces 2C-T’s hallucinogenic and entheogenic effects has not been specifically established, however it is most likely to result from action as a 5-HT_2A serotonin receptor agonist in the brain, a mechanism of action shared by all of the hallucinogenic tryptamines and phenethylamines for which the mechanism of action is known. It also acts as a MAOI.