A medicinal pill, originally compressed herbs. A throat pastille is a large candy-like lozenge, which, when sucked, releases oils to soothe a sore throat and sometimes vapors to help unblock the nose or sinuses
A pastille is a small, round sweet or piece of candy that has a fruit flavour. Some pastilles contain medicine and you can suck them if you have a sore throat or a cough. a small round sweet, sometimes containing medicine for a sore throat = lozenge