Koichi screamed, "Stop doing drugs right now!" and pointed at Viet's nose with his index finger.
Viet made a clean break from both the yakuza world and drugs.
Have you ever had an allergic reaction to any medicines?
Medicine things are medicines and drugs. Try not to take too many of these, now!
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.