The right medicine for a female about to go droopy (6)

I believe the answer is:
dosage
'go droopy' is the definition.
I can't tell whether this defines the answer.
'the right medicine for a female about' is the wordplay.
'the right medicine for' becomes 'sag' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'a female' becomes 'doe' (female deer).
'about' is an insertion indicator.
'sag' put inside 'doe' is 'DOSAGE'.
'to' is the link.
Can you help me to learn more?
(Other definitions for dosage that I've seen before include "Giving of medicine in prescribed amount" , "quantity of drug" , "Correct use of a prescribed drug" , "Medicine administered" , "Sea dog (anag)" .)
