# Resflor Gold (Florfenicol + Flunixin meglumine) Dose for Cattle: Strengths & Dose Calculator

> Resflor Gold combines florfenicol 300 mg/mL with flunixin 16.5 mg/mL (Merck Animal Health) for bovine respiratory disease and its fever in beef and non-lactating dairy cattle. It is a single SC dose…

- Source page: https://wevet.in/vet-products/resflor-gold-florfenicol-flunixin-meglumine/
- Type: Vet product
- Publisher: WeVet
- Updated: 2026-11-02
- Medically reviewed by: Dr. Ravi Baraiya, B.V.Sc. (2026-11-02)
- Audience: veterinarians and veterinary students

Resflor Gold combines florfenicol 300 mg/mL with flunixin 16.5 mg/mL (Merck Animal Health) for bovine respiratory disease and its fever in beef and non-lactating dairy cattle [1]. It is a single SC dose of 6 mL per 100 lb — 40 mg/kg florfenicol and 2.2 mg/kg flunixin [1].

- Brand: Resflor Gold
- Contains: Florfenicol + Flunixin meglumine
- Company: MSD Animal Health (Merck Animal Health in the US)
- Label species: Cattle
- Data from: USA (FDA label)

## Strengths

- Resflor Gold injection: Florfenicol 300 mg per mL (verified, [1]); Flunixin meglumine 16.5 mg per mL (verified, [1])

## Dose by species

| Species | Use | Dose | Route | How often | Basis |
|---|---|---|---|---|---|
| Cattle | Bovine respiratory disease with fever (Gives 2.2 mg/kg flunixin at the same time. Not more than 10 mL per injection site.) | 40 mg/kg [1] | SC | Once | Label |

## Label directions

- Give once SC: 40 mg/kg florfenicol + 2.2 mg/kg flunixin (6 mL per 100 lb) [1].
- No more than 10 mL at each site [1].

## Warnings and precautions

- Not approved for female dairy cattle 20 months of age or older, including dry cows [1].
- Do not use in calves to be processed for veal or in animals intended for breeding [1].

## Withdrawal periods

- Cattle, meat: 38 days — Not slaughtered within 38 days of treatment. [1]

Interactive dose calculator (strength prefilled only when confirmed): use the page link above.

## Frequently asked questions

### What is the Resflor Gold dose?

One SC injection of 6 mL per 100 lb — 40 mg/kg florfenicol and 2.2 mg/kg flunixin [1].

### What is the meat withdrawal for Resflor Gold?

38 days [1].

## References

[1] RESFLOR GOLD — label — Drugs.com Vet — US label text, Merck Animal Health (2026). https://drugs.com/vet/resflor-gold.html
[2] Dosages of Chloramphenicol and Florfenicol — Merck Veterinary Manual (table) (2024). https://www.merckvetmanual.com/multimedia/table/dosages-of-chloramphenicol-and-florfenicol
[3] ZELERIS — Canadian label — Drugs.com Vet — Canadian label text, Ceva (2026). https://www.drugs.com/vet/zeleris-can.html
[4] Nonsteroidal Anti-inflammatory Drugs in Animals — Merck Veterinary Manual — S. H. Edwards (updated Sep 2024) (2024). https://www.merckvetmanual.com/pharmacology/inflammation/nonsteroidal-anti-inflammatory-drugs-in-animals
[5] BANAMINE (flunixin meglumine injection) — label — Drugs.com Vet — US label text, Merck Animal Health (2026). https://drugs.com/vet/banamine-injectable-solution.html
[6] BANAMINE Transdermal (flunixin pour-on) — Canadian label — Drugs.com Vet — Canadian label text, Merck Animal Health (2026). https://drugs.com/vet/banamine-transdermal-can.html
[7] MEGLUDYNE Injection — product page — Virbac India — official product page (2026). https://in.virbac.com/home/cattle/products/anti-inflammatory/megludyne-injection-flunixin-meglumine-injection

---
Numbers in [brackets] cite the references above. For veterinary professionals. Information supports — never replaces — clinical judgement; always check the current product label and local regulations.
Ask follow-up questions in WeVet (free AI assistant for veterinarians): https://wevet.in/