EXCENEL® RTU (ceftiofur hydrochloride) Sterile Suspension0% Milk Discard. 100% Peace of Mind. Protect your cows and your bottom line with EXCENEL® RTU (ceftiofur hydrochloride) Sterile Suspension. EXCENEL RTU offers effective treatment, along with the peace of mind that comes with no milk discard.* Once you discover the efficacy, cost savings, ease of use and versatility of EXCENEL RTU, you’ll wonder how you ever ran your dairy without it.