For all you codeine fiends, not quite as simple as a cwe but a great procedure f you want to make lots up at once. Pure and easy for measuring and containing. Also, when in this form a little bit more chemistry can be applied and greater results can occur. Don't know if I allowed to go into that though.
1. Extraction of codeine
Several packets of tablets, sufficient to yield about 2 g of codeine, are crushed and mixed with water. The mixture is filtered using a filter pump, Buchner funnel and side-arm flask, to remove tablet binding agents, diluents and other excipients. The aqueous filtrate is poured into a separating funnel and sodium hydroxide solution added to make the solution strongly alkaline. This is then extracted with chloroform (about 50 ml). The chloroform layer is drained off and evaporated to dryness using gentle heating (often on a domestic stove). The aqueous layer containing aspirin and paracetamol is discarded. The codeine base is recovered as a white crystalline solid.