The Oral route is the preferred route for medicating rats post-operatively . Catching the rat is a stressor, especially if it's already uncomfortable. Injecting the rat is a stressor.
Rats dislike injections, but enjoy treats.
You must order this product through the usual campus purchasing channels. For information about ordering controlled substances, see the UC Davis Policy and Procedure Manual Section 290-70. Animals exhibiting pica may ingest large quantities of bedding after recovering from anesthesia which may occasionally cause gastric obstruction. It is recommended that analgesics be given prior to the animal's recovering from anesthesia. Animals painful enough to require an analgesic should not be gavaged.