MDA is similar to MDMA, but its an empathogen-entheogen rather than an empathogen-entactogen. It (as opposed to MDMA) does make one stoned, and at higher doses it tends to be hard to remember the first part of the sentence that a person is speaking. Its generally not considered anywhere near as useful for therapy as MDMA, although some researchers have had some success with it.☆ Neurochemically, MDA and MDMA are quite different. Their active isomers are switched, and MDA seems to effect the 5-HT2 receptor where MDMA is inactive. ☆