Words to Describe painkillers

How painkillers often is described ("________ painkillers")

• extra
• regular
• opiate
• opioid
• simple
• inflammatory
• endogenous
• many
• prescribed
• more
• potent
• strong
• heavy
• pharmaceutical
• natural
• mild
• fewer
• conventional
• ordinary
• excellent
• few
• nonprescription
• enough
• internal
• serious
• synthetic
• artificial
• based
• avoid
• usual
• dreadful
• stronger
• own
• oral
• addictive
• nonaddictive
• strongest
• duty
• available
• counter
• effective
• narcotic
• powerful
• traditional
• other
• acting