Murphy is 18 and from the Merseyside area but also has strong links to South Cumbria.
He is wanted for failing to appear at Crown Court for serious drugs supply offences.
He is described as white, of medium build and around six feet tall. He has brown hair and may have a beard or unshaven appearance.
Anyone who sees Murphy is urged to call police on 999. Anyone else with information which could assist is urged to call 101.
Call non-emergency number: 101
Or Crimestoppers anonymously on 0800 555 111.
Always call in an emergency 999