It seems to me that it means that something was done according to a previous scenario (script). So it was "scripted previously" (script was done previously to doing it) = pre-scripted. Of course it could also be a wrong use of prescribed.
Something recemended by doctors.
What does 5mld mean on a prescription bottle
Rx stands for prescription, GRP for group. It is the group number of your prescription.
means prescription and take
Geriatric=elderly
apple cheese
Queer sort
you are myopic.
original pack
take monthly
once daily
non-renewable
BID or bid on a prescription mean "twice a day". PM mean afternoon or evening, unless it was prn and that means "as needed". Or if it is po, then that means "by mouth".