pillhead
(noun) A person who is addicted to and abuses prescription narcotics. More often than not the pillhead pulverizes their narcotics, preparing the drug for inhalation. It is then when the pillhead sniffs/snorts up all the pulverized narcotic before them, ingesting it how many people might ingest cocaine.
Robbie's got to be the biggest pillhead in the neighborhood. I've seen the motherfucker sniff fuckin' everything up his nose; Lorset, Tylox, Metadone, you name it. If he can turn it to powder you can consider it up his nose. I, myself, am considering the real possibility that the son-of-a-bitch stole my tools last night.