Freebase vs. Fumarate — What's the Difference?

To purify (cocaine) by treating its powdered hydrochloride form with an alkaloid solution such as ammonia and then using a heated solvent to separate out the precipitate.

A salt or ester of fumaric acid.

To use (cocaine purified in this way) by smoking it or by inhaling the fumes after burning it.

Any salt or ester of fumaric acid; they are produced in the body as part of the urea cycle.

To prepare or use cocaine purified in this way.

A salt of fumaric acid.

Cocaine purified by this method.

(chemistry) The purified, dry form of an amine, especially an alkaloid natural product, that is normally used in solution.

(specifically) The purified, dry form of certain illegal drugs, especially cocaine.

To purify a drug by crystallization.

To use a purified drug, especially cocaine, by heating it and inhaling the fumes produced.