Label: NUFLOR-S- florfenicol injection

PRODUCT
INFORMATION

For intramuscular use in swine except for nursing piglets and swine of reproductive age intended for breeding.

CAUTION: Federal law restricts this drug to use by or on the order of a licensed veterinarian.

DESCRIPTION: Nuflor®-S Injectable Solution is a sterile solution of the synthetic, broad-spectrum antibiotic florfenicol. Each milliliter of sterile Nuflor®-S Injectable Solution contains 300 mg of florfenicol, 250 mg N-methyl-2-pyrrolidone (NMP), 150 mg propylene glycol and polyethylene glycol q.s.

INDICATIONS: Nuflor®-S Injectable Solution is indicated for treatment of swine respiratory disease associated with Actinobacillus pleuropneumoniae, Pasteurella multocida, Salmonella Choleraesuis, Streptococcus suis, Bordetella bronchiseptica, and Glaesserella (Haemophilus) parasuis in swine except for nursing piglets and swine of reproductive age intended for breeding.

DOSAGE AND ADMINISTRATION: Nuflor®-S Injectable Solution should be administered by intramuscular injection to swine at a dose rate of 15 mg/kg (1 mL/45 lb) body weight. A second dose should be administered 48 hours later. The injection should be given only in the neck musculature. If a positive response is not noted within 24 hours after the second injection, the diagnosis should be re-evaluated, and/or an alternative treatment may be considered. Administered dose volume should not exceed 10 mL per injection site.

WARNINGS: NOT FOR HUMAN USE. KEEP OUT OF REACH OF CHILDREN. This product contains materials that can be irritating to skin and eyes. Avoid direct contact with skin, eyes and clothing. In case of accidental eye exposure, flush with water for 15 minutes. In case of accidental skin exposure, wash with soap and water. Remove contaminated clothing. Consult a physician if irritation persists. Accidental injection of this product may cause local irritation. Consult a physician immediately. Reproductive and developmental toxicities have been reported in laboratory animals following high, repeated exposures to NMP. Pregnant women should wear gloves and exercise caution or avoid handling this product. The Safety Data Sheet (SDS) contains more detailed occupational safety information.

For customer service, adverse effects reporting and/or a copy of the SDS, call 1-800-211-3573. For additional information about adverse drug experience reporting for animal drugs, contact FDA at 1-888-FDA-VETS or online at www.fda.gov/reportanimalae.

PRECAUTIONS: Not for use in animals intended for breeding purposes. The effects of florfenicol on porcine reproductive performance, pregnancy and lactation have not been determined.

Intramuscular injection in swine may result in local tissue reaction which could persist up to 21 days post-dosing. This may result in trim loss of edible tissue at slaughter.

RESIDUE WARNINGS: Swine intended for human consumption must not be slaughtered within 11 days of the last intramuscular treatment.

ADVERSE REACTIONS: Perianal inflammation, rectal eversion, rectal prolapse and diarrhea may occur transiently following treatment. Decreased feed and water consumption may occur if the labeled dosage regimen is exceeded.

CLINICAL PHARMACOLOGY: The pharmacokinetic disposition of florfenicol was evaluated in 20 pigs following a single IM injection of Nuflor®-S at the labeled dose of 15 mg/kg BW. The mean ± standard deviation maximum plasma concentration (Cmax) and the time to reach Cmax (Tmax) of florfenicol were 3.42 ± 0.82 μg/mL and 4.70 ± 2.15 hours, respectively. The mean ± standard deviation area under the drug concentration-time curve between times 0 and the last quantifiable concentration (AUC0-LOQ) and the terminal half-life (T1/2) of florfenicol were 70.34 ± 23.78 μg*hours/mL and 11.21 ± 3.73 hours, respectively.

ANIMAL SAFETY: A safety study was conducted in 40 healthy crossbred growing pigs. Pigs were administered florfenicol by IM injection in the neck at 1X, 3X, or 5X the labeled dose (15, 45, or 75 mg/kg BW, respectively) for 3X the labeled duration of treatment (6 injections at 48-hour intervals), or 10X the labeled dose (150 mg/kg BW) administered as two injections 48 hours apart. Test article-related diarrhea (moderate), anal swelling/erythema (mild to moderate), and injection site swelling (mild to moderate) were seen in all florfenicol-treated groups after dosing, most frequently in the 3X and 5X groups. Although these findings were considered clinically relevant, the incidence and severity in the 1X group was considered within acceptable limits. Test article-related decreases in feed and water consumption and an associated decrease in body weight were seen in the 3X and 5X groups. Test article-related changes in some serum chemistry parameters and decreased numbers of white blood cells were seen in the 3X, 5X, and/or 10X groups; the changes were generally minimal and not considered clinically significant. Most changes in drug-related, in-life parameters did not become apparent until after dosing was extended beyond the labeled duration of two injections, 48 hours apart.

Injection site irritation was evaluated in a safety study using 20 healthy crossbred growing pigs administered florfenicol at 15 mg/kg BW IM in the neck as two injections 48 hours apart. Mild injection site swelling was seen in up to approximately 32% of the pigs by 4 days post-injection and was resolved by 16 days post-injection. Gross and histopathologic evaluation showed that injection site discoloration and inflammation was present at 7 and 14 days post-injection, and absent at 21, 28, and 42 days post-injection.

STORAGE CONDITIONS: Store between 2-30°C (36-86°F). Do not store above 30°C (86°F). Protect from light when not in use. Use within 30 days of first puncture and puncture a maximum of 30 times. If more than 30 punctures are anticipated, the use of multi-dosing equipment is recommended. When using a draw-off spike or needle with bore diameter larger than 18 gauge, discard any product remaining in the vial immediately after use.

HOW SUPPLIED: Nuflor®-S (florfenicol) Injectable Solution is packaged in 100 mL glass sterile multiple dose vials.

Approved by FDA under NADA # 141-063
Formulated in Germany.
Copyright© 2022 Merck & Co., Inc., Rahway, NJ, USA
and its affiliates. All rights reserved.
Rev. 06/22

394544 R1

100 mL
Multiple-Dose Vial
300 mg/mL

NDC 0061-5581-02
Sterile

Nuflor®-S
(FLORFENICOL)
Injectable Solution

For intramuscular use in swine
except for nursing piglets and
swine of reproductive age intended
for breeding.

CAUTION: Federal law restricts this
drug to use by or on the order of a
licensed veterinarian.

Approved by FDA under NADA
# 141-063

MERCK
Animal Health