The horse should receive 4 mL
Explanation:
- Step 1: Find the mL of oral solution the horse should be given.
Prescribed amount = 128 mg
Amount of solution in 160 mg = 5 mL
Amount of solution in 1 mg = 5/160 mL
⇒ Amount of solution in 128 mg = 128 × 5/160 = 4 mL