Unless specifically excepted by state or federal law or regulation or more specifically included in another schedule, the following controlled substances are listed in Schedule IV:

(a) [(1)] Any material, compound, mixture, or preparation containing any of the following narcotic drugs, or their salts calculated as the free anhydrous base or alkaloid, in limited quantities as set forth below:

(1) [(a)] Not more than 1 milligram of difenoxin and not less than 25 micrograms of atropine sulfate per dosage unit.

(2) [(b)] Dextropropoxyphene (alpha-(+)-4-dimethylamino-1,2-diphenyl-3-methyl-2-propionoxybutane).

(b) [(2)] Depressants. Unless specifically excepted or unless listed in another schedule, any material, compound, mixture, or preparation containing any quantity of the following substances having a depressant effect on the central nervous system, including their salts, isomers, and salts of isomers whenever the existence of those salts, isomers, and salts of isomers is possible within the specific chemical designation:

(1) [(a)] Alprazolam;

(2) [(b)] Barbital;

(3) [(c)] Bromazepam;

(4) [(d)] Camazepam;

(5) [(e)] Carisoprodol;

(6) [(f)] Chloral betaine;

(7) [(g)] Chloral hydrate;

(8) [(h)] Chlordiazepoxide;

(9) [(i)] Clobazam;

(10) [(j)] Clonazepam;

(11) [(k)] Clorazepate;

(12) [(l)] Clotiazepam;

(13) [(m)] Cloxazolam;

(14) [(n)] Delorazepam;

(15) [(o)] Diazepam;

(16) [(p)] Dichloralphenazone;

(17) [(q)] Estazolam;

(18) [(r)] Ethchlorvynol;

(19) [(s)] Ethinamate;

(20) [(t)] Ethyl loflazepate;

(21) [(u)] Fludiazepam;

(22) [(v)] Flunitrazepam;

(23) [(w)] Flurazepam;

(24) [(x)] Halazepam;

(25) [(y)] Haloxazolam;

(26) [(z)] Ketazolam;

(27) [(aa)] Loprazolam;

(28) [(bb)] Lorazepam;

(29) [(cc)] Lormetazepam;

(30) [(dd)] Mebutamate;

(31) [(ee)] Medazepam;

(32) [(ff)] Meprobamate;

(33) [(gg)] Methohexital;

(34) [(hh)] Methylphenobarbital (mephobarbital);

(35) [(ii)] Midazolam;

(36) [(jj)] Nimetazepam;

(37) [(kk)] Nitrazepam;

(38) [(ll)] Nordiazepam;

(39) [(mm)] Oxazepam;

(40) [(nn)] Oxazolam;

(41) [(oo)] Paraldehyde;

(42) [(pp)] Petrichloral;

(43) [(qq)] Phenobarbital;

(44) [(rr)] Pinazepam;

(45) [(ss)] Prazepam;

(46) [(tt)] Quazepam;

(47) [(uu)] Temazepam;

(48) [(vv)] Tetrazepam;

(49) [(ww)] Triazolam;

(50) [(xx)] Zaleplon;

(51) [(yy)] Zolpidem; and

(52) [(zz)] Zopiclone.

(c) [(3)] Fenfluramine. Any material, compound, mixture, or preparation containing any quantity of the following substance, including its salts, isomers, and salts of such isomers, whenever the existence of such salts, isomers, and salts of isomers is possible: Fenfluramine.

(d) [(4)] Stimulants. Unless specifically excepted or unless listed in another schedule, any material, compound, mixture, or preparation containing any quantity of the following substances having a stimulant effect on the central nervous system, including their salts, isomers, and salts of isomers:

(1) [(a)] Cathine((+)norpseudoephedrine);

(2) [(b)] Diethylpropion;

(3) [(c)] Fencamfamin;

(4) [(d)] Fenproporex;

(5) [(e)] Mazindol;

(6) [(f)] Mefenorex;

(7) [(g)] Modafinil;

(8) [(h)] Pemoline (including organometallic complexes and chelates thereof);

(9) [(i)] Phentermine;

(10) [(j)] Pipradrol;

(11) [(k)] Sibutramine;

(12) [(l)] SPA ((-)-1-dimethylamino-1, 2-dephenylethane).

(e) [(5)] Other substances. Unless specifically excepted or unless listed in another schedule, any material, compound, mixture, or preparation containing any quantity of the following substance, including its salts:

(1) [(a)] Pentazocine;

(2) [(b)] Butorphanol, including its optical isomers.

The commission may except by rule any compound, mixture, or preparation containing any depressant substance listed in subsection (b) [(2)] of this section from the application of all or any part of this chapter if the compound, mixture, or preparation contains one or more active medicinal ingredients not having a depressant effect on the central nervous system, and if the admixtures are in combinations, quantity, proportion, or concentration that vitiate the potential for abuse of the substances having a depressant effect on the central nervous system.

The controlled substances listed in this section may be added, rescheduled, or deleted as provided for in RCW 69.50.201.

Commission may change schedules of controlled substances: RCW 69.50.201.