LONCOR 300- florfenicol solution
Bayer HealthCare, LLC Animal Health Division
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LoncorTM 300
(florfenicol)
300 mg/mL Injectable Solution
For intramuscular and subcutaneous use in beef and non-lactating dairy cattle only
Not for use in female dairy cattle 20 months of age or older or in calves to be processed for veal
DESCRIPTION
LONCOR™ 300 (florfenicol) 300 mg/mL Injectable Solution is a solution of the synthetic antibiotic florfenicol. Each milliliter of sterile LONCOR™ 300 contains 300 mg of florfenicol, 250 mg n-methyl-2-pyrrolidone, 150 mg propylene glycol, and polyethylene glycol qs.
INDICATIONS
LONCOR™ 300 is indicated for treatment of bovine respiratory disease (BRD) associated with Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni, and for the treatment of bovine interdigital phlegmon (foot rot, acute interdigital necrobacillosis, infectious pododermatitis) associated with Fusobacterium necrophorum and Bacteroides melaninogenicus. Also, it is indicated for the control of respiratory disease in cattle at high risk of developing BRD associated with Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni.
DOSAGE AND ADMINISTRATION
For treatment of bovine respiratory disease (BRD) and bovine interdigital phlegmon (foot rot): LONCOR™ 300 should be administered by intramuscular injection to cattle at a dose rate of 20 mg/kg body weight (3 mL/100 lbs). A second dose should be administered 48 hours later. Alternatively, LONCOR™ 300 can be administered by a single subcutaneous (SC) injection to cattle at a dose rate of 40 mg/kg body weight (6 mL/100 lbs). Do not administer more than 10 mL at each site. The injection should be given only in the neck.
NOTE: Intramuscular injection may result in local tissue reaction which persists beyond 28 days. This may result in trim loss of edible tissue at slaughter. Tissue reaction at injection sites other than the neck is likely to be more severe.
For control of respiratory disease in cattle at high risk of developing BRD: LONCOR™ 300 should be administered by a single subcutaneous injection to cattle at a dose rate of 40 mg/kg body weight (6 mL/100 lbs). Do not administer more than 10 mL at each site. The injection should be given only in the neck.
| Clinical improvement should be evident in most treated subjects within 24 hours of initiation of treatment. If a positive response is not noted within 72 hours of initiation of treatment, the diagnosis should be re-evaluated. | ||
|
ANIMAL WEIGHT (lbs) |
IM LONCOR 300 DOSAGE 3.0 mL/100 lb Body Weight (mL) |
SC LONCOR 300 DOSAGE 6.0 mL/100 lb Body Weight (mL) |
|
100 |
3.0 |
6.0 |
|
200 |
6.0 |
12.0 |
|
300 |
9.0 |
18.0 |
|
400 |
12.0 |
24.0 |
|
500 |
15.0 |
30.0 |
|
600 |
18.0 |
36.0 |
|
700 |
21.0 |
42.0 |
|
800 |
24.0 |
48.0 |
|
900 |
27.0 |
54.0 |
|
1000 |
30.0 |
60.0 |
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. The Material Safety Data Sheet (MSDS) contains more detailed occupational safety information. For customer service, adverse effects reporting, and/or a copy of the MSDS, call 1-800-422-9874.
PRECAUTIONS
Not for use in animals intended for breeding purposes. The effects of florfenicol on bovine reproductive performance, pregnancy, and lactation have not been determined. Toxicity studies in dogs, rats, and mice have associated the use of florfenicol with testicular degeneration and atrophy. Intramuscular injection may result in local tissue reaction which persists beyond 28 days. This may result in trim loss of edible tissue at slaughter. Tissue reaction at injection sites other than the neck is likely to be more severe.
RESIDUE WARNINGS
Animals intended for human consumption must not be slaughtered within 28 days of the last intramuscular treatment. Animals intended for human consumption must not be slaughtered within 38 days of subcutaneous treatment. This product is not approved for use in female dairy cattle 20 months of age or older, including dry dairy cows. Use in these cattle may cause drug residues in milk and/or calves born to these cows. A withdrawal period has not been established in pre-ruminating calves. Do not use in calves to be processed for veal.
ADVERSE REACTIONS
Inappetence, decreased water consumption, or diarrhea may occur transiently following treatment.
CLINICAL PHARMACOLOGY
The pharmacokinetic disposition of florfenicol was evaluated in feeder calves following single intramuscular (IM) administration at the recommended dose of 20 mg/kg body weight. Florfenicol was also administered intravenously (IV) to the same cattle in order to calculate the volume of distribution, clearance, and percent bioavailability1 (Table 1).
| * harmonic mean Cmax Maximum serum concentration ** mean value Tmax Time at which Cmax is observed *** following IV administration T 1/2 Biological half-life AUC Area under the curve Vdss Volume of distribution at steady state Clt Total body clearance |
||
|
Parameter |
Median |
Range |
|
Cmax (μg/mL) |
3.07* |
1.43 - 5.60 |
|
Tmax (hr) |
3.33 |
0.75 - 8.00 |
|
T 1/2 (hr) |
18.3** |
8.30 - 44.0 |
|
AUC (μg•min/mL) |
4242 |
3200 - 6250 |
|
Bioavailability (%) |
78.5 |
59.3 - 106 |
|
Vdss (L/kg)*** |
0.77 |
0.68 - 0.85 |
|
Clt (mL/min/kg)*** |
3.75 |
3.17 - 4.31 |
Florfenicol was detectable in the serum of most animals through 60 hours after intramuscular administration with a mean concentration of 0.19 μg/mL. The protein binding of florfenicol was 12.7%, 13.2%, and 18.3% at serum concentrations of 0.5, 3.0, and 16.0 μg/mL, respectively.
MICROBIOLOGY
Florfenicol is a synthetic, broad-spectrum antibiotic active against many Gram-negative and Gram-positive bacteria isolated from domestic animals. It acts by binding to the 50S ribosomal subunit and inhibiting bacterial protein synthesis. Florfenicol is generally considered a bacteriostatic drug, but exhibits bactericidal activity against certain bacterial species. In vitro studies demonstrate that florfenicol is active against the bovine respiratory disease (BRD) pathogens Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni, and that florfenicol exhibits bactericidal activity against strains of M. haemolytica and H. somni. Clinical studies confirm the efficacy of florfenicol against BRD as well as against commonly isolated bacterial pathogens in bovine interdigital phlegmon including Fusobacterium necrophorum and Bacteroides melaninogenicus.
The minimum inhibitory concentrations (MICs) of florfenicol for BRD organisms were determined using isolates obtained from natural infections from 1990 to 1993. The MICs for interdigital phlegmon organisms were determined using isolates obtained from natural infections from 1973 to 1997 (Table 2).
| * The correlation between the in vitro susceptibility data and clinical effectiveness is unknown. ** The lowest MIC to encompass 50% and 90% of the most susceptible isolates, respectively. |
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|
Indicated pathogens |
Year of |
Isolate |
MIC50** |
MIC90** |
|
Mannheimia haemolytica |
1990 to 1993 |
398 |
0.5 |
1 |
|
Pasteurella multocida |
1990 to 1993 |
350 |
0.5 |
0.5 |
|
Histophilus somni |
1990 to 1993 |
66 |
0.25 |
0.5 |
|
Fusobacterium necrophorum |
1973 to 1997 |
33 |
0.25 |
0.25 |
|
Bacteroides melaninogenicus |
1973 to 1997 |
20 |
0.25 |
0.25 |
ANIMAL SAFETY
A 10X safety study was conducted in feeder calves. Two intramuscular injections of 200 mg/kg were administered at a 48-hour interval. The calves were monitored for 14 days after the second dose. Marked anorexia, decreased water consumption, decreased body weight, and increased serum enzymes were observed following dose administration. These effects resolved by the end of the study.
A 1X, 3X, and 5X (20, 60, and 100 mg/kg) safety study was conducted in feeder calves for 3X the duration of treatment (6 injections at 48-hour intervals). Slight decrease in feed and water consumption was observed in the 1X dose group. Decreased feed and water consumption, body weight, urine pH, and increased serum enzymes, were observed in the 3X and 5X dose groups. Depression, soft stool consistency, and dehydration were also observed in some animals (most frequently at the 3X and 5X dose levels), primarily near the end of dosing.
A 43-day controlled study was conducted in healthy cattle to evaluate effects of florfenicol administered at the recommended dose on feed consumption. Although a transient decrease in feed consumption was observed, florfenicol administration had no long-term effect on body weight, rate of gain, or feed consumption.
STORAGE INFORMATION
Store below 30°C (86°F).
250 mL: Once opened, use contents within 6 months. The solution is light yellow to straw colored. Color does not affect potency.
500 mL: Stopper should not be punctured more than 90 times.
REFERENCE
1. Lobell RD, Varma KJ, et al. Pharmacokinetics of florfenicol following intravenous and intramuscular doses to cattle. J Vet Pharmacol Therap. 1994; 17:253-258.
Made in China
V-05/2016
©2016 Bayer
LONCOR™ 300
Bayer (reg’d), the Bayer Cross (reg’d) and LONCOR™ are trademarks of Bayer.
PRINCIPAL DISPLAY PANEL – 250 mL Carton Label
NDC 0859-2411-04
Multiple-Dose Vial
Sterile
LoncorTM 300
(florfenicol)
300 mg/mL
Injectable Solution
For intramuscular and subcutaneous use in beef and non-lactating dairy cattle only
Not for use in female dairy cattle 20 months of age or older or in calves to be processed for veal
CAUTION: Federal law restricts this drug to use by or on the order of a licensed veterinarian.
250 mL
Bayer HealthCare LLC, Animal Health,
Shawnee Mission, Kansas 66201 U.S.A.
Made in China
ANADA 200-582, Approved by FDA
PRINCIPAL DISPLAY PANEL – 250 mL Vial Label
NDC 0859-2411-03
Multiple-Dose Vial
Sterile
LoncorTM 300
(florfenicol)
300 mg/mL Injectable Solution
For intramuscular and subcutaneous use in beef and non-lactating dairy cattle only
Not for use in female dairy cattle 20 months of age or older or in calves to be processed for veal
CAUTION: Federal law restricts this drug to use by or on the order of a licensed veterinarian.
250 mL
DESCRIPTION: Each milliliter contains 300 mg of florfenicol, 250 mg n-methyl-2-pyrrolidone, 150 mg propylene glycol, and polyethylene glycol qs.
Bayer HealthCare LLC, Animal Health Division, Shawnee Mission, Kansas 66201 U.S.A.
Bayer (reg’d), the Bayer Cross (reg’d) and LoncorTM are trademarks of Bayer.
Made in China
ANADA 200-582, Approved by FDA
PRINCIPAL DISPLAY PANEL – 500 mL Vial Label
NDC 0859-2411-05
Multiple-Dose Vial
Sterile
LoncorTM 300
(florfenicol)
300 mg/mL Injectable Solution
For intramuscular and subcutaneous use in beef and non-lactating dairy cattle only
Not for use in female dairy cattle 20 months of age or older or in calves to be processed for veal
CAUTION: Federal law restricts this drug to use by or on the order of a licensed veterinarian.
DESCRIPTION: Each milliliter contains 300 mg of florfenicol, 250 mg n-methyl-2-pyrrolidone, 150 mg propylene glycol, and polyethylene glycol qs.
500 mL
Bayer HealthCare LLC, Animal Health Division
Shawnee Mission, Kansas 66201 U.S.A.
Bayer (reg’d), the Bayer Cross (reg’d) and LoncorTM are trademarks of Bayer.
Made in China
ANADA 200-582, Approved by FDA
| LONCOR 300
florfenicol solution |
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| Labeler - Bayer HealthCare, LLC Animal Health Division (152266193) |