substitute
5 Controlled drugs—Code, s 600, def controlled drug
(1) A substance mentioned in schedule 1 is prescribed.
(2) The following substances (each of which is a related drug ) are also prescribed:
(a) a form of a drug mentioned in schedule 1, whether natural or synthetic, and the salts, derivatives and isomers of that drug and any salt of those derivatives and isomers;
(b) a drug that is in a class of drugs mentioned in schedule 1, whether natural or synthetic, and the salts, derivatives and isomers of that drug and any salt of those derivatives and isomers;
(c) an analogue in relation to a drug mentioned in schedule 1, which includes any substance having a substantially similar chemical structure to the drug, but differing in elemental composition due to the addition, deletion or replacement of any substituent element or group;
(d) a homologue in relation to a drug mentioned in schedule 1, which includes any substance which differs from that drug by one or more carbon containing groups (including methylene groups) in that chemical structure;
(e) a substance containing or mixed with a substance mentioned in schedule 1.