The standard drug label templates include a facility to generate a general purpose label.  A general purpose label will be printed for any medication product with the Printe Name set to "LABEL-CSB". For example:

This will generate a label like:

(this is using the Diskette sized label). As you can see the 'Animal Use Only' gets suppressed and the product name is replaced by the patient's Colour/Species/Breed (hence the CSB).

Note that because you can do a New Medication on the Patients|Medical records screen, select this product, fill in the label text and print the label, and THEN cancel, you can generate a label and not leave an entry in the medical records.