Tablet or caplet
I believe the answer is:
pill
I believe this clue is a double definition.
'tablet' is the first definition.
(I know that tablet can be written as pill)
'caplet' is the second definition.
(I've seen this in another clue)
(Other definitions for pill that I've seen before include "Lozenge" , "Dose of medicine" , "Form of medicine" , "Medical tablet" , "Medicinal pellet" .)