Paranoid psychoses after abuse of proprietary cold remedies.

It is well established that psychosis may arise in the context of the abuse of certain prescribed or illicit drugs. Two cases of paranoid psychosis are described in which proprietary preparations containing amphetamine-like drugs were abused. The role of these drugs is discussed with reference to previous case reports, and it is emphasised that initial clinical assessment and urinary screening for drugs may fail to reveal the relevant history with respect to proprietary medicines.