A dosage form not commercially available is made by a pharmacy.

the sign-out initials of nurses who administer medications to patients.

Extemporaneous is defined as being carried out, such as a performance, with little to no preparation. A sentence for this word is "The candidate's extemporaneous speech really seemed to motivate his audience".

The opposite of extemporaneous is premeditated or planned.

The extemporaneous style of speaking lies midway between reading a prepared text and impromptu delivery.