Totally-OT, But I Need the Help

[Legbreaker]

Very true, and we know that horse steroids are often abused by weightlifters and the like. It seems likely to me that many other animal medications may also be used in humans (with possible unwanted side effects).
The trick will be in having a character of sufficient skill in Biology, Chemistry and Medical to make the necessary allowances and perhaps even tinker with the chemical structure/purity/etc of the animal medicine.

Given the game is often set in 2000 and nuclear war commenced roughly three years earlier, I doubt there would be much prewar animal medicine left in usable/safe condition. It also seems highly doubtful there'd have been any significant production post nuke, with those few surviving laboratories concentrating on human needs first and foremost.

Herbs and other natural remedies would likely be the only recourse for most farmers and animal owners, with even military animals being treated with techniques from the 19th century (I see human medicine being equivalent to roughly the 1920's on the whole).