Lorazipam, Librium, Xanax, Valium, Clonopin, along with quite a few others are all tranquilizers, mixing any combination of them will really do no harm... If you are on an SSRI or SDRI, I would refrain from doing them too often as your medication might start to not work as well.
(youll start becoming dependent on tranquilizers to "chill" you out, when your normal scrip is supposed to do that)
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"He who makes a beast of himself gets rid of the pain in being a man"
Hunter S. Thompson