I dont think the drug company could make it much clearer...Do not use in cats is listed on the client info sheet in bold. It is also listed multiple times in the insert.
Im glad you are spending time researching it so you can make an informed decision. I did not do that for Latte 3.5yrs ago and she ended up in acute renal failure, fighting for her life for many weeks. She ended up w/ one partially working kidney when all was said and done.
It sounds as if LB already received a shot? If thats the case it would not be recommended to give any more (see black box warning). Dosing is a huge issue, as the vets in the US use a higher concentration, but neglect to take that into account, thus od'ing. This issue is addressed in a dr doctor letter sent to YOUR Vet and all others around the country. There is very little room for error when dosing metacam...VERY LITTLE. You do not just dbl a dose.
Please read some of the stories of other pet owners w/ cats who died or developed chronic life threatening conditions in the link in my sig (metacam kills), read the inser listed in the think tank again, ask your vet for alternative pain medication (buprenex is common for pancreatitis). Finally, ask yoursel...is it worth the risk? Have I tried all other SAFER options? Is this truley our last resort? Then, make your decision.
If you chose to go w/ it MAKE SURE you are using the correct dose and become familiar w/ what symptoms to look for in case of an adverse reaction. And DO get full labs done before starting to make sure your kitty does not already have renal issues. You will need to get regular labs while using it.