Iowa Code § 205.5: Regulations as to sales of certain poisons.

It shall be unlawful for any person except a licensed pharmacist to sell at retail any of the poisons enumerated in this section: Ammoniated mercury, mercury bichloride, red mercuric iodide, and other poisonous salts and compounds of mercury; salts and compounds of arsenic; salts of antimony; salts of barium except the sulphate; salts of thallium; hydrocyanic acid and its salts; chromic, glacial acetic, and picric acids; chloral hydrate, croton oil, creosol, chloroform, dinitrophenol, ether, oil of bitter almonds, phenol, phosphorus and sodium fluoride; aconitine, arecoline, atropine, brucine, homatropine, hyoscyamine, nicotine, strychnine, and the salts of these alkaloids; aconite, belladonna, cantharides, digitalis, nux vomica, veratrum, and the preparations of these poisonous drugs.