A.T. Robertson Commentary Revelation 9:21

"and they repented not of their murders, nor of their sorceries, nor of their fornication, nor of their thefts." — Revelation 9:21 (ASV)

Of their murders (εκ των φονων αυτων). Heads the list, but "sorceries" (εκ των φαρμακων) comes next. Φαρμακον was originally enchantment, as also in Re 21:8, then drug. For φαρμακια see Re 18:34; Galatians 5:20. The two other items are fornication (πορνειας) and thefts (κλεμματων, old word from κλεπτω, here alone in N.T.), all four characteristic of demonic worship and idolatry. See other lists of vices in Mr 7:21; Galatians 5:20; Revelation 21:8; 22:15. Our word "pharmacy" as applied to drugs and medicine has certainly come a long way out of a bad environment, but there is still a bad odour about "patent medicines."