Long Acting BRD Treatment for Cattle Product Description LONCOR 300 is a prescription injectable medication that contains florfenicol. It is made for use in beef cattle and dairy cows that are not producing milk. This product is used to treat bovine respiratory disease and foot rot. It can also be given to help control respiratory disease in cattle that are considered high risk. The medication can be administered either as an intramuscular injection or as a single subcutaneous dose, giving flexibility in how it is used. It helps against a wide range of bacteria and is dosed based on the animal’s weight, making it practical and straightforward to use. Benefits Broad Spectrum Coverage: Works against key bacteria such as Mannheimia haemolytica, Pasteurella multocida, Histophilus somni, Fusobacterium necrophorum, and Bacteroides melaninogenicus. Flexible Administration: Can be given either as a two-dose intramuscular treatment or as a single subcutaneous injection, following the approved dosing directions. High Risk Control: Approved for use in cattle that face a higher chance of developing bovine respiratory disease, helping manage and reduce the risk of respiratory illness in these animals. Established Withdrawal Periods: Includes clear slaughter withdrawal times, with 28 days required after intramuscular use and 38 days after subcutaneous use, helping ensure proper residue compliance. Documented Pharmacokinetics: Has demonstrated reliable absorption and maintained blood levels when administered by intramuscular injection at the recommended dose. Variants Loncor 300 (Florfenicol) Injectable Solution is available in the following sizes: 250mL vial 500mL vial Ingredients Composition Table Ingredient Quantity per mL Florfenicol 300 mg N-methyl-2-pyrrolidone 250 mg Propylene glycol 150 mg Polyethylene glycol qs How to Use Recommended-Dosage Chart Animal Weight (lbs) IM Dose 3 mL per 100 lb (mL) SC Dose 6 mL per 100 lb (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 Dosage & Administration Instructions Prescription Only: By federal law, this medication can only be used by a licensed veterinarian or under their direct guidance. IM Treatment Option: Give 20 mg per kg of body weight by intramuscular injection, then repeat the same dose 48 hours later. SC Single Dose: Give 40 mg per kg of body weight as one subcutaneous injection. Neck Injection Only: Administer injections only in the neck area to help reduce the risk and severity of tissue reactions. Site Volume Limit: Do not inject more than 10 mL into a single injection site. Response Monitoring: If the animal does not show clear improvement within 72 hours, review the diagnosis and reassess the treatment plan. Disclaimer: This dosage information is provided by the manufacturer. Always consult your veterinarian before administering or adjusting any supplement for your pet. Additional Information Precautions Breeding Restriction: Not for use in animals intended for breeding purposes. Dairy Limitation: Not approved for female dairy cattle 20 months of age or older. Veal Prohibition: Do not use in calves intended to be processed for veal. Injection Reaction: Intramuscular injection may cause local tissue reactions lasting beyond 28 days. Withdrawal Periods: Observe 28-day IM and 38-day SC slaughter withdrawal periods. Possible Side Effects Reduced Appetite: Inappetence may occur transiently following treatment administration. Lower Water Intake: Decreased water consumption has been reported after dosing. Diarrhea Episodes: Transient diarrhea may occur following treatment. Storage Information Temperature Control: Store below 30°C or 86°F to maintain product stability. Light Protection: Protect from light when not in use. Post Opening Use: Use contents within 6 months after first opening. Color Variation: Solution may appear light yellow to straw colored without affecting potency. Shipping & Return We offer ground, express, priority, and international delivery; see our shipping policy for details. For return instructions or product concerns, please refer to our detailed refund policy. Prescription items are NON-RETURNABLE and NON-REFUNDABLE. Frequently Asked Questions Q1: What is LONCOR 300 used for in cattle? Ans: LONCOR 300 is used to treat bovine respiratory disease caused by Mannheimia haemolytica, Pasteurella multocida, and Histophilus somni. It is also approved for the treatment of bovine interdigital phlegmon, commonly known as foot rot. In addition, it can be used to help control respiratory disease in cattle that are at a higher risk of developing bovine respiratory disease. Q2: How is LONCOR 300 administered to cattle? Ans: LONCOR 300 may be administered intramuscularly at 20 mg per kg body weight with a repeat dose after 48 hours, or as a single subcutaneous injection at 40 mg per kg. Injections must be given only in the neck and limited to 10 mL per site. Q3: What is the withdrawal period after using LONCOR 300? Ans: Cattle raised for human consumption should not be sent to slaughter until at least 28 days have passed after the final intramuscular dose or 38 days after a subcutaneous dose. This product is also not approved for use in female dairy cattle that are 20 months old or older. Q4: Is LONCOR 300 safe for all cattle? Ans: LONCOR 300 is cleared for use only in beef cattle and in dairy cows that are not lactating. It must not be given to female dairy cows that are 20 months old or older, calves that are being raised for veal, or animals intended for breeding. This is because its safety has not been established for these specific groups. Q5: What side effects can occur after administering LONCOR 300? Ans: Transient adverse reactions may include reduced appetite, decreased water consumption, or diarrhea following treatment. Intramuscular injections may also cause local tissue reactions that can persist beyond 28 days and may result in trim loss at slaughter.
