Dewormers & parasiticides · Over the counter
Synanthic withdrawal time for cattle
oxfendazole. Used for stomach and intestinal worms and lungworms — concentrated oral drench.
Slaughter withdrawal
7 days
| Route / formulation | Slaughter withdrawal | Detail |
|---|---|---|
| Oral drench (22.5% or 9.06% suspension) | 7 days |
Milk & dairy: Do not use in female dairy cattle of breeding age (no milk withdrawal established).
Synanthic is the third benzimidazole drench, with the shortest hold of the class: 7 days. The concentrated 22.5% suspension keeps dose volumes small, which crews appreciate at the chute.
Like Valbazen, it lacks a dairy approval — the dairy-legal member of the family is fenbendazole (Safe-Guard).
What the label requires
- Slaughter withdrawal: 7 days.
- Shortest withdrawal of the white-wormer drenches.
- Not for dairy females of breeding age.
Always follow the label on your bottle and your veterinarian's directions. Extra-label use — any different dose, route, or frequency — voids the withdrawal above; your vet sets the interval instead, usually via FARAD. When in doubt, hold longer. Label data checked July 18, 2026. Source: FDA label (DailyMed).
Never ship a treated animal by mistake
Log a treatment in HerdCommand with its withdrawal days and the animal carries a hold flag until the date clears — and the sale workflow warns you before a flagged animal ends up on a load. Works from the phone in your pocket, at the chute.
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Common questions
How long is the Synanthic withdrawal?
7 days from treatment to slaughter — the shortest of the benzimidazole drenches (Safe-Guard suspension is 8, Valbazen is 27).