The needle got me sick, whatever Robitussin will get it
I'mma dragon,

from Domo Genesis & Alchemist (Ft. Tyler The Creator) – No Idols Lyrics on Rap Genius

Meaning

The drugs he takes to soothe his asthma make him a sick rapper (aka a good rapper).
He uses the words “needle” and “dragon” as a play on using Heroin, as when people use it, it’s called “chasing the dragon.” He’s also comparing himself to dragon because he spits fire when he raps.

Additionally, Chris Rock highlighted a joke that whatever the problem is Robotussin will ‘get it’ (i.e — cure any problem).

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