Methylxanthine Bronchodilators

Theophylline (parenteral)

Dogs: 10 mg/kg, IV (slow) or IM

Horses: 15 mg/kg, IV (slow)

Theophylline (oral)

Dogs: 5–7 mg/kg, PO, q 8 h

Cats: 3 mg/kg, PO, q 12 h

Horses: 10–15 mg/kg, PO, q 12 h

Theophylline (extended-release tablets)

Dogs: 20 mg/kg/day, PO

Cats: 25 mg/kg/day, PO

Horses: 15 mg/kg/day, PO

Aminophylline (parenteral)

Dogs: 10 mg/kg, IV (slow)

Cats: 5 mg/kg, IV (slow)

Horses: 5 mg/kg, IV (slow)

Aminophylline (oral)

Dogs: 10 mg/kg, PO, q 8 h

Cats: 5 mg/kg, PO, q 12 h

Horses: 15 mg/kg, PO, q 12 h