The rate of delivery you have described is (720 mg/da)/((4 ml/hr)(24 hr/da)) = 720/(4*24) mg/ml = 720/96 = 7 1/2 mg/ml. That's 2/15 ml/mg ≈ .133 ml/mg.
You need to check the medicine to see how it is actually formulated.
You need to check the medicine to see how it is actually formulated.