It certainly harder to come by. I treat Human so I do not know much about what is available for researcher or Vet. The following is my information about pricin gof cefotaxime from uptodate.com, a professional medical information site that I use a lot.
I try to use medication that is cheap and easily available. If what we usually use does not work then we can expand to different antibiotic. Cephotaxime can be use and it should be effective. I would use 1000 mg per 10 liter. If you use it, please post so we can all gain some experience. These are wholesale price. Pharmacy will add their profit on top of this. AWP is Average Wholesale Price
Quote from uptodate.com
Pricing: U.S.
Solution (Claforan in D5W Intravenous)
1 gm/50 mL (50 mL): $16.15
2 gm/50 mL (50 mL): $28.54
Solution (reconstituted) (Cefotaxime Sodium Injection)
1 g (1): $2.64
2 g (1): $13.00
10 g (1): $65.00
500 mg (1): $6.38
Solution (reconstituted) (Claforan Injection)
1 g (1): $2.06
2 g (1): $5.05
10 g (1): $22.68
500 mg (1): $1.80
Solution (reconstituted) (Claforan Intravenous)
1 g (1): $4.04
2 g (1): $7.32
Disclaimer: The pricing data provide a representative AWP and/or AAWP price from a single manufacturer of the brand and/or generic product, respectively. The pricing data should be used for benchmarking purposes only, and as such should not be used to set or adjudicate any prices for reimbursement or purchasing functions. Pricing data is updated monthly.