I don't know for sure, Gaz. I do know that Dr. Droke donates appropriate drugs to SAGA when they go out of date, and it is safe to use those for a limited period. Discretion has to be used based on the condition of the drug and its packaging.

But I wasn't meaning to imply that SAGA only uses out-of-date drugs, just that in the case in question (and specific others) they did. But more to the point, other than pretty normal "over-the-counter" medicines, a vet is normally needed to determine what drugs should be given in any particular case, and in what dosage. And as Dr. Droke has posted on Facebook, to watch for adverse reactions to those drugs and deal quickly with that situation.