Free base
Pure molecular form of an amine, as opposed to its protonated salt form
Free base
In chemistry, a free base (freebase, free-base) is the neutral form of an amine or other Lewis base. The term is used in the pharmaceutical industry in contrast to salt-based formulations like hydrochlorides. The amine is often an alkaloid, such as nicotine, morphine, and cocaine, or derivatives thereof. Colloquially, "free-basing" also means the treatment of salts or other formulations to convert them into the free base form, especially for recreational drugs.
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