Allergic 

there is poetry in chemistry:

dextromethorphan hydrobromide
pseudoephedrine hydrochloride
chloropheniramine

antihistamines
expectorants
decongestants

loratimide
netipot
rose hip

post nasal drip
post nasal depression
catarrh,
but no catharsis.

……another re-post, but ’tis the season.