Capsule contents (4)
'capsule contents' 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 (med.)" , "some Viagra, perhaps?" , "Measure of medicine" , "Measure of drug" , "Measured portion of medicine" .)
(Other definitions for overview that I've seen before include "Broad perspective formed from above, general survey" , "General summary of a subject" , "inspection" .)