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Date: Thursday, May 2, 2024 16:38

Release 2.61
Resflor® 300/16.5 mg/ml Solution for Injection for Cattle
 
Species: Cattle
Therapeutic indication: Pharmaceuticals: Antimicrobials: Injections
Active ingredient: Florfenicol, Flunixin Meglumine
Product:Resflor® 300/16.5 mg/ml Solution for Injection for Cattle
Product index: Resflor® 300/16.5 mg/ml
Cattle - milk: See notes
Cattle - meat: 46 days
Withdrawal notes: Milk: Not authorized for use in lactating animals producing milk for human consumption. Do not use during lactation or drying off periods. Do not use in pregnant animals which are intended to produce milk for human consumption within 2 months of expected parturition.
Incorporating:
Qualitative and quantitative composition
Each ml contains:
Active substances:
Flunixin 16.5 mg equivalent to 27.4 mg flunixin meglumine
Florfenicol 300 mg
Excipients:
N-Methyl-2-Pyrrolidone 250.0 mg
Propylene Glycol (Antimicrobial Preservative) E1520 150.0 mg
For a full list of excipients, see section “Pharmaceutical Particulars”.
Pharmaceutical form
Solution for injection.
Clear, light yellow to straw coloured liquid.
Clinical particulars
Target species
Cattle
Indications for use
Treatment of respiratory infections caused by Mannheimia haemolytica, Pasteurella multocida, Mycoplasma bovis and Histophilus somni associated with pyrexia.
Contraindications
Do not use in adult bulls intended for breeding purposes.
Do not use in animals suffering from hepatic and renal diseases.
Do not use if there is a risk of gastrointestinal bleeding or in cases where there is evidence of altered haemostasis.
Do not use in animals suffering from cardiac diseases.
Do not use in cases of hypersensitivity to the active substances or to any of the excipients.
Special warnings for each target species
None.
Special precautions for use
Use of the product should be based on susceptibility testing of the bacteria isolated from the animal. If this is not possible, therapy should be based on local (regional, farm level) epidemiological information about susceptibility of the target bacteria.
Official and local antimicrobial policies should be taken into account when the product is used.
Use of the product deviating from the instructions given in the SPC may increase the prevalence of bacteria resistant to florfenicol.
Avoid use in dehydrated, hypovolaemic or hypotensive animals as there is a potential risk of increased renal toxicity. Concurrent administration of potentially nephrotoxic drugs should be avoided.
Repeated daily dosing has been associated with abomasal erosions in the pre-ruminant calf. The product should be used with caution in this age group.
The safety of the product has not been tested in calves of 3 weeks of age or less.
Flunixin is toxic to avian scavengers. Do not administer to animals susceptible to enter wild fauna food chain. In case of death or sacrifice of treated animals, ensure that they are not made available to wild fauna.
Operator warnings
Care should be taken to avoid accidental self-injection.
People with known hypersensitivity to propylene glycol and polyethylene glycols should avoid contact with the veterinary medicinal product.
Wash hands after use.
Laboratory studies in rabbits and rats with the excipient N-methyl pyrrolidone have shown evidence of foetotoxic effects. Women of childbearing age, pregnant women or women suspected of being pregnant should use the veterinary medicinal product with serious caution to avoid accidental self-injection.
Adverse reactions
Cattle:
Very common
(>1 animal / 10 animals treated):
Injection site swelling1
Very rare
(<1 animal / 10,000 animals treated, including isolated reports):
Anaphylactic-type reaction2
1becomes palpable 2-3 days after subcutaneous injection. The duration of the injection site swellings ranged from 15-36 days post-injection. Grossly, this is associated with minimal to mild irritation of the subcutis. Extension into the underlying muscle was noted in only a few instances. By 56 days post-dosing, no gross lesions were observed that would require any trim-out at slaughter.
2these reactions may be fatal.
Reporting adverse events is important. It allows continuous safety monitoring of a veterinary medicinal product. Reports should be sent, preferably via a veterinarian, to either the marketing authorisation holder or its local representative or the national competent authority via the national reporting system. See the package leaflet for respective contact details.
Use during pregnancy or lactation
The safety of the veterinary medicinal product has not been established in cattle during pregnancy, lactation or in animals intended for breeding. Laboratory studies in rabbits and rats with the excipient N-methyl pyrrolidone have shown evidence of foetotoxic effects. Use only according to the benefit-risk assessment by the responsible veterinarian.
Interactions
Concurrent use of other active substances that have a high degree of protein binding may compete with flunixin for binding and thus lead to toxic effects. Pre-treatment with other anti-inflammatory substances may result in additional or increased adverse effects and accordingly a treatment-free period with such drugs should be observed for at least 24 hours before the commencement of treatment. The treatment-free period, however, should take into account the pharmacokinetic properties of the products used previously. The product must not be administered in conjunction with other NSAIDs or glucocorticosteroids. Gastrointestinal tract ulceration may be exacerbated by corticosteroids in animals given NSAIDs.
Amounts to be administered and administration route
Subcutaneous use.
40 mg/kg florfenicol and 2.2 mg/kg flunixin (2 ml/15 kg body weight) to be administered by a single injection. To ensure a correct dosage, body weight should be determined as accurately as possible. The dose volume given at any one injection site should not exceed 10 ml.
It is recommended to treat animals in the early stages of the disease and to evaluate the response to treatment 48 hours after injection. The anti-inflammatory component of the veterinary medicinal product, flunixin, may mask a poor bacteriological response to florfenicol in the first 24 hours after injection. If clinical signs of respiratory disease persist or increase, or if relapse occurs, treatment should be changed, using another antibiotic, and continued until clinical signs have resolved.
The injection should only be given in the neck.
Swab septum before removing each dose. Use a dry sterile needle and syringe.
Overdose
Overdose studies in the target species for 3 times the duration of treatment showed decreased food consumption in the groups given 3 and 5 times the recommended dose. Decreased body weights were observed in the 5 times overdose group (secondary to decreased food consumption). Decreased water consumption was observed in the 5 times overdose group. Tissue irritation increases with injection volume.
Treatment at 3 times the recommended treatment duration was associated with dose related erosive and ulcerative abomasum lesions
Withdrawal periods
Meat and offal: 46 days.
Milk: Not authorised for use in animals producing milk for human consumption. Do not use in pregnant animals which are intended to produce milk for human consumption within 2 months of expected parturition.
Pharmacological particulars
ATCvet code: QJ01BA99
Pharmacotherapeutic Group
Antibacterials for systemic use, amphenicols, combinations.
Pharmacodynamic properties
Florfenicol is a synthetic broad spectrum antibiotic effective against most Gram-positive and Gram-negative bacteria isolated from domestic animals. Florfenicol acts by inhibiting bacterial protein synthesis at the ribosomal level and is bacteriostatic. Laboratory tests have shown that florfenicol is active against the most commonly isolated bacterial pathogens involved in bovine respiratory disease which include M. bovis, M. haemolytica, P. multocida and H. somni. Florfenicol is considered to be a bacteriostatic agent, but in vitro studies of florfenicol demonstrate bactericidal activity against M. haemolytica, P. multocida and H. somni. Florfenicol bactericidal activity was characterised as essentially time dependant against the three target pathogens with the possible exception of H. somni where a concentration dependency was observed. During the florfenicol susceptibility monitoring program (2000-2003) a total of 487 M. haemolytica, 522 P. multocida and 25 H. somni isolates were collected. MIC values ranged between <0.12 and 2 µg/ml for M. haemolytica (MIC90 = 1 µg/ml), between <0.12 and 2 µg/ml for P. multocida (MIC90 = 0.50 µg/ml) and between 0.12 and 0.5 µg/ml for H. somni. Breakpoints have been established by the CLSI (Clinical and Laboratory Standard Institute) for bovine respiratory pathogens as follows (see table):
Table for Resflor 300/16.5 mg/ml
Pathogen
Florfenicol Disk Concentration (µg)
Diameter (mm)
MIC (µg/ml)
S
I
R
S
I
R
M. haemolytica
P. multocida
H. somni
30
≥19
15-18
≤14
≤2
4
≥8
There are no established breakpoints for M. bovis nor have culture techniques been standardized by CLSI. Despite a reduction in M. bovis pathogen load, M. bovis may not be fully eliminated from the lungs after treatment with the veterinary medicinal product.
The only mechanisms of chloramphenicol resistance that are known to have significant clinical relevance are CAT-mediated inactivation and efflux-pump resistance. Of these, only some of the efflux mediated resistance would also confer resistance to florfenicol and thus have the potential to be affected by florfenicol use in animals. Resistance to florfenicol in the target pathogens has only been reported on rare occasions and was associated with efflux pump and the presence of the floR gene. Flunixin meglumine is a non-steroidal anti-inflammatory drug with analgesic and antipyretic activity. Flunixin meglumine acts as a reversible non-selective inhibitor of cyclo-oxygenase (both COX 1 and COX 2 forms), an important enzyme in the arachidonic acid cascade pathway which is responsible for converting arachidonic acid to cyclic endoperoxides. Consequently, synthesis of eicosanoids, important mediators of the inflammatory process involved in central pyresis, pain perception and tissue inflammation, is inhibited. Through its effects on the arachidonic acid cascade, flunixin also inhibits the production of thromboxane, a potent platelet pro-aggregator and vasoconstrictor which is released during blood clotting. Flunixin exerts its antipyretic effect by inhibiting prostaglandin E2 synthesis in the hypothalamus. Although flunixin has no direct effect on endotoxins after they have been produced, it reduces prostaglandin production and hence reduces the many effects of the prostaglandin cascade. Prostaglandins are part of the complex processes involved in the development of endotoxic shock.
Pharmacokinetic properties
The administration of the product by the subcutaneous route at the recommended dosage of 40 mg/kg florfenicol maintained efficacious plasma levels in cattle above a MIC90 of 1 µg/ml for approximately 50 hours and above a MIC90 of 2 µg/ml for approximately 36 hours. Maximum plasma concentration (Cmax) of approximately 9.9 µg/ml occurred approximately 8 hours (Tmax) after dosing.
After administration of the product by the subcutaneous route at the recommended dosage of 2.2 mg/kg flunixin peak plasma concentrations of 2.8 µg/ml were achieved after 1 hour.
The binding of florfenicol on proteins is approximately 20% and for flunixin > 99%. The degree of elimination of florfenicol residues in urine is approximately 68% and in faeces approximately 8%. The degree of elimination of flunixin residues in urine is approximately 34% and for faeces approximately 57%.
Environmental properties
Flunixin is toxic to avian scavengers although foreseen low exposure leads to low risk.
Pharmaceutical particulars
Excipients
Propylene Glycol (E1520)
N-Methyl-2-Pyrrolidone
Citric acid, anhydrous
Macrogol 300
Major incompatibilities
In the absence of compatibility studies, this veterinary medicinal product must not be mixed with other veterinary medicinal products.
Shelf life
Shelf life of the veterinary medicinal product as packaged for sale: 2 years.
Shelf life after first opening the immediate packaging: 28 days.
Special precautions for storage
Do not store above 25 °C. Do not freeze. Protect from frost.
Immediate packaging
Type I glass vials closed with bromobutyl stoppers and aluminium seals.
Carton box containing 100 ml vial
Carton box containing 250 ml vial
Not all pack sizes may be marketed.
Disposal
Medicines should not be disposed of via wastewater.
Marketing Authorisation Number
UK (GB): Vm 01708/5081
UK (NI): Vm 01708/3014
Significant changes
Date of the first authorisation or date of renewal
16 May 2011.
Date of revision of the text
October 2023.
Any other information
For animal treatment only. Keep out of the sight and reach of children.
If you notice any side effects or other effects not mentioned in this leaflet, or you think that the medicine has not worked, please inform your veterinary surgeon.
Legal category
Legal category: POM-V
GTIN
GTIN description:Resflor 1x100ml:
GTIN:05017363026535,
GTIN description:Resflor 1x250ml:
GTIN:05017363026528