In terms of benzo's or SSRI's, unless you're taking MAOIs (and as I'm told benzos don't fall into this category), then there should be no physical danger in taking the DMT and/or LSD. However it could definitely muddy up the experience, make it hard to get effects or just be a general lack in clarity.
"Science without religion is lame. Religion without science is blind" - Albert Einstein
"The Mighty One appears, the horizon shines. Atum appears on the smell of his censing, the Sunshine- god has risen in the sky, the Mansion of the pyramidion is in joy and all its inmates are assembled, a voice calls out within the shrine, shouting reverberates around the Netherworld." - Egyptian Book of the Dead
"Man fears time, but time fears the Pyramids" - 9th century Arab proverb