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Drug
Dosage
Castor oil
Dogs: 5–25 mL, PO
Foals: 25–50 mL, PO
Bisacodyl
Dogs: 5–20 mg, PO, once to twice daily
Cats: 2.5–5 mg, PO, once to twice daily
Magnesium sulfate (Epsom salts)
Dogs: 5–25 g, PO
Cats: 2–5 g, PO
Horses: 30–100 g, PO
Magnesium hydroxide (milk of magnesia)
Dogs: 5–10 mL, PO
Cats: 2–6 mL, PO
Horses: 1–4 L, PO
Lactulose
Dogs: 5–15 mL, PO, tid
Cats: 2–3 mL, PO, tid
Docusate sodium, docusate calcium, docusate potassium
Dogs and cats: 2 mg/kg/day, PO
Horses: 10–20 mg/kg in 2 L water
