Common analgesic (7)
'common analgesic' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for aspirin that I've seen before include "Headache pill" , "Pain relief" , "Mild pain-killing drug" , "Pain-relieving tablet" , "Common pain tablet" .)
(Other definitions for ibuprofen that I've seen before include "Anti-inflammatory medicine" , "anaesthetic" , "Painkiller" , "Drug" .)