Codeine
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Codeine is an opiate drug, primarily used in the management of mild-to-moderate pain. It occurs naturally in the sap of the opium poppy. The most common route of administration is oral via a pill, in which case the drug normally begins working within 30 minutes, although injection of codeine into a vein provides the quickest effects.
Codeine is a Class B drug in the UK, although it may be purchased in pharmacies in low doses.
Codeine is a prodrug of morphine (which also occurs naturally in opium) meaning it metabolises into morphine after administration.