One tablet, maybe (4)
I believe the answer is:
dose
'one tablet maybe' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for dose that I've seen before include "Measure of drug" , "Shot of medicine" , "Measure (med.)" , "Measured amount of medicine" , "Amount of medicine to be taken at one time" .)