The Borax combo, also known by the informal brand names Blue Bliss and Pink Star, is a combination recreational and designer drug described as an MDMA-like entactogen.

[3][6][7] In addition, the Borax combo has received scientific interest due to its apparent ability to closely mimic the effects of MDMA.

[1][2][4] Subsequently, the Borax combo was encountered as a novel designer drug or "legal high" with growing prominence in 2020 and thereafter, owing to the fact that none of its several components were controlled substances (though see laws like the Federal Analogue Act).

[3][6][7] The combination has been sold online in the form of ecstasy-like pressed tablets under informal brand names such as Blue Bliss and Pink Star.

[2] There is scientific interest in the development of alternatives to MDMA with better properties like improved safety and reduced neurotoxicity for potential use in medicine such as in entactogen-assisted psychotherapy.