该款兽药用于促进猪生长以及饲料在猪体内的转化率。生产厂商表示，该款兽药不再生产，因此美国FDA撤销该款兽药的许可申请。
部分原文报道如下：
The Food and Drug Administration （FDA） is withdrawing approval of
those parts of a new animal drug application （NADA） for a 3-way,
fixed-ratio, combination drug Type A medicated article that pertain to
use of the procaine penicillin component for production indications in
swine. This action is being taken at the sponsor's request because the
3-way Type A medicated article is no longer manufactured.
原文链接：https://www.federalregister.gov/documents/2016/09/14/2016-21984/new-animal-drugs-chlortetracycline-procaine-penicillin-and-sulfamethazine-withdrawal-of-approval
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