A physician treating an addict for addiction may not prescribe for or furnish to the addict more than any one of the following amounts of controlled substances during each of the first 15 days of that treatment:
(a) Eight grains of opium.
(b) Four grains of morphine.
(c) Six grains of Pantopon.
(d) One grain of Dilaudid.
(e) Four hundred milligrams of isonipecaine (Demerol).