ויאמר יהוה אל-משה קח-לך סמים...
Hashem said to Moshe, take drugs...
What was Moshe on? And where do we see examples of this?
When Moshe was on Har Sinai receiving the torah he was high (up), so he must have had the drugs then.
Before matan torah he was on Har Sinai once before, talking to a burning bush. But it wasn't much of a bush -- a lowly thing, according to R' Eliezer in Sh'mot Rabbah, barely a bush at all.
More like a weed, really.
While poskim frown on weed because of the harm it does to us, there is room for leniency if it's actually good for you. Weed provided by God Himself, presented aflame to suggest smoking, is surely ok.
So the drug Moshe used was cannabis.
One drug that we know he took was RNA / DNA complex. Because Moses was about 80 years old, and we know that he fasted for about 120 days during approx. his first year leading the people, G-d was fearful that he would lose protein, so G-d tells him:
וַיֹּאמֶר֩ יְהוָ֨ה אֶל־מֹשֶׁ֜ה קַח־לְךָ֣ סַמִּ֗ים ... וְחֶלְבְּנָ֔ה
Take drugs - protein
DNA & RNA are the main composites of protein.