Priority was accorded to substances included within the WHO model list of essential drugs.³ Altogether 110 of 296 substances tested were degraded under the conditions employed.

³ WHO Technical Report Series, No. 722, 1985 (WHO Expert Committee on The Use of Essential Drugs).

Acetylsalicylic acid
Aminophylline
Amitriptyline hydrochloride
Ammonium chloride
Amphotericin B
Ampicillin sodium
Ampicillin trihydrate
Antimony sodium tartrate
Ascorbic acid

Bacitracin
Bacitracin zinc
Benzathine benyzlpencillin
Benzylpencillin sodium
Bephenium hydroxynaphthoate
Benzylpencillin potassium

Calcium gluconate
Calcium para-aminosalicylate
Carbenicillin sodium
Cefalexin
Chloral hydrate
Chloramphenicol sodium succinate
Chlorphenamine hydrogen maleate
Chlorpromazine hydrochloride
Chlortetracycline hydrochloride
Cloxacillin sodium (monohydrate)
Coal tar
Codeine phosphate
Colecalciferol
Cresol

Dapsone
Dexamethasone sodium phosphate
Dicloxacillin sodium (monohydrate)
Diethylcarbamazine dihydrogen citrate
Doxycycline hyclate

Emetine hydrochloride
Ephedrine
Ephedrine sulfate
Epinephrine
Epinephrine hydrogen tartrate
Ergocalciferol
Ergometrine hydrogen maleate
Ergotamine maleate
Ergotamine tartrate
Ethosuximide
Ethylmorphine hydrochloride

Ferrous sulfate
Fluphenazine decanoate
Fluphenazine hydrochloride
Formaldehyde solution

Gentamicin sulfate
Guanethidine sulfate

Hexylresorcinol
Hydralazine hydrochloride
Hydrocortisone sodium succinate
Hydroxocobalamin
Hyoscyamine sulfate

Imipramine hydrochloride
Ipecacuanha powder
Isoprenaline hydrochloride
Isoprenaline sulfate

Lidocaine hydrochloride

Melarsoprol
Mercuric oxide yellow
Metrifonate

Naloxone hydrochloride
Neomycin sulfate
Nystatin

Orciprenaline sulfate
Oxytetracyline hydrochloride

Paromomycin sulfate
Penicillamine
Pethidine hydrochloride
Phenobarbital sodium
Phenoxymethylpenicillin
Phenoxymethylpenicillin calcium
Phenoxymethylpenicillin potassium
Phentolamine mesilate
Phenylbutazone
Pilocarpine hydrochloride
Pilocarpine nitrate
Procainamide hydrochloride
Procaine benzylpencillin
Procaine hydrochloride
Procarbazine hydrochloride
Promazine hydrochloride
Promethazine hydrochloride
Pyridoxine hydrochloride

Quinine bisulfate
Quinine dihydrochloride

Retinol (Vitamin A)

Salbutamol sulfate
Senna leaf
Silver nitrate
Sodium calcium edetate
Sodium lactate
Sodium nitrite
Sodium para-aminosalicylate
Sodium stibogluconate
Sulfacetamide sodium
Sulfadiazine sodium
Sulfadimidine sodium
Suxamethonium chloride

Tetracaine hydrochloride
Tetracycline hydrochloride
Thiamine hydrochloride
Thiamine mononitrate
Thiopental sodium
Tolbutamide

Undecylenic acid

Warfarin sodium