Magnesium Sulfate Dosing for Dogs, Cats, Horses, Cattle By Weight
Important Safety Information
Do not exceed 25 g total in horses for IV infusion. Monitor for signs of magnesium toxicity.
Use with caution in animals with renal impairment or heart block.
Reference Source
Saunders Handbook of VETERINARY DRUGS, Page 495-497
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Standard Dosage Guidelines
Small Animal Dosage
| Species | Route | Dosage | Frequency | Notes |
|---|---|---|---|---|
| Dogs | PO | 1-2 mEq/kg/day | Daily | Equivalent to 0.5-1.0 mmol/kg PO (or 8-25 g/dog q24h PO) |
| Cats | PO | 2-5 g/cat | Daily | |
| Dogs and Cats | IV | 0.2-0.3 mEq/kg | Single dose at 0.12 mEq/kg/min | For magnesium deficiency or arrhythmias |
| CRI | 0.2-1.0 mEq/kg/day | Constant rate infusion | For treating arrhythmias or ongoing deficiency | |
| Fluid Supplement | 0.75-1.0 mEq/kg/day | During fluid therapy | Supplement fluid solutions |
Large Animal Dosage
| Species | Route | Dosage | Frequency | Notes |
|---|---|---|---|---|
| Cattle | IV | 2-3 g/cow | Over 10 minutes | May be followed by 200-400 mL of 25% magnesium sulfate SQ to supply 50-100 g per cow |
| Horses | PO | 1 g/horse | q12-24h | |
| IV | 2-4 mg/kg | Single dose | ||
| IV Infusion | 1-25 g | 1 g/min up to maximum | For ventricular tachycardia |