Spectrum sells a large variety of quality chemical products including Naltrexone Hydrochloride. This off-white powder exudes no odor and is not a danger for flame or combustion. It is a hydrochloride salt with a heterocyclic structure and was first synthesized in the 1960's. It is soluble in water and should be stored at +4°C under desiccating conditions. Naltrexone Hydrochloride can keep in sotarge for up to 12 months.