USA – Merck Animal Health has received FDA approval for NUFLOR-S (florfenicol) Injectable Solution and AROVYN (tulathromycin injection) – broad-spectrum, prescription antibiotics that treat the most important organisms associated with swine respiratory disease (SRD).

Merck Animal Health is pleased to expand our portfolio of offerings with two antimicrobials to help veterinarians and producers combat SRD,” Doug King, DVM, associate director of the swine technical services for Merck Animal Health, said in a release.

We are committed to partnering with veterinarians and swine producers and offering comprehensive solutions that lead to improved animal health outcomes and welfare. Expanding our portfolio to include antimicrobials further enables us to accomplish this goal.”

Florfenicol Injectable Solution is indicated for remedy of SRD related to Actinobacillus pleuropneumoniae, Pasteurella multocida, Salmonella Choleraesuis, Streptococcus suis, Bordetella bronchiseptica.

It is also indicated for Glaesserella (Haemophilus) parasuis in swine apart from nursing piglets and swine of reproductive age supposed for breeding. 

Tulathromycin injectable solution is indicated for the treatment of SRD caused by Actinobacillus pleuropneumoniae, Pasteurella multocida, Bordetella bronchiseptica, Haemophilus parasuis, and Mycoplasma hyopneumoniae.

It is also indicated for the control of SRD caused by Actinobacillus pleuropneumoniae, Pasteurella multocida, and Mycoplasm hyopneumoniae.

This medication should not be given to animals who are known to be hypersensitive to it. Tulathromycin injectable solution has an 18-day preslaughter withdrawal time in cattle.

This medication should not be used on female dairy cattle over the age of 20 months. Tulathromycin injectable solution has a preslaughter withdrawal time of 5 days in swine.

Florfenicol – a prescription antibiotic for swine, and Tulathromycin — a prescription antibiotic for cattle and swine – will be available from or on the order of a licensed veterinarian.

Florfenicol will be available in 100-mL vials and Tulathromycin will come in 100-, 250- and 500-mL vials.

Florfenicol’s dosage and administration

Florfenicol Injectable Solution should be given to cattle intramuscularly at a dose rate of 20mg/kg body weight (3 mL/100 lbs).

A follow-up dose should be given 48 hours later. Florfenicol Injectable Solution can also be given to cattle as a single subcutaneous injection at a dose rate of 40mg/kg body weight (6 mL/100 lbs).

Care should be taken not to give more than 10 mL at each site. The injection should only be given in the neck.

Florfenicol injectable solution should not be administered to breeding animals. According to Merck, perianal inflammation, rectal eversion, rectal prolapse, and diarrhea may occur transiently following treatment.

Furthermore, swine intended for human consumption must not be slaughtered within 11 days of the most recent intramuscular treatment.

At the time of slaughter, intramuscular injection may result in trim loss of edible tissue. Florfenicol’s effects on porcine reproductive performance, pregnancy, and lactation have yet to be determined

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