Phenytoin, Phenytoin Sodium Dosing for Dogs, Cats, Horses By Weight
Important Safety Information
Safe and effective dose has not been established in cats. Use with caution and monitor closely.
For horses: Initial bolus of 20 mg/kg q12h PO for four doses, followed by 10-15 mg/kg q12h PO.
Reference Source
Saunders Handbook of VETERINARY DRUGS, Page 661-662
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Standard Dosage Guidelines
Small Animal Dosage
| Species | Route | Dosage | Frequency |
|---|---|---|---|
| Dogs | PO | 20-35 mg/kg | q8h |
| IV | 10 mg/kg | Single dose over 5 min | |
| Cats | - | Not established | - |
Large Animal Dosage
| Species | Route | Dosage | Frequency |
|---|---|---|---|
| Horses | PO | 10-20 mg/kg | q12h |
| IV | 7.5-8.8 mg/kg | Single dose followed by oral maintenance |