Section 23(2)(a): amended, on 8 August 1990, by section 3 of the Medicines Amendment Act (No 2) 1990 (1990 No 97).
Section 23(4): amended, on 23 February 1987, by section 2(1) of the Medicines Amendment Act 1987 (1987 No 9).
Section 23(4A): inserted, on 23 February 1987, by section 2(2) of the Medicines Amendment Act 1987 (1987 No 9).
Section 23(4B): inserted, on 23 February 1987, by section 2(2) of the Medicines Amendment Act 1987 (1987 No 9).