Hypoprolactinaemic galactorrhoea in long-term methadone treatment

Although hyperprolactinaemia is associated with galactorrhoea, galactorrhoea often occurs without any hyperprolactinaemia. This has been well established, and it has been documented in women prescribed/using methadone and other opiates. One case series described amenorrhoea and galactorrhoea in 'female heroin addicts', but it has not before been described in a patient with hypoprolactinaemia. We report a case of a 30 year old non-pregnant, non-puerperal, opioid-dependent, HIV positive woman on long-term methadone maintenance programme, who presented with bilateral, milky nipple discharge, associated with painful breast lumps, but with serum prolactin levels below the normal range. She was not prescribed any other medications likely to have effect on the endocrine system. This case highlights the need for prescribers to be alert to the implications of long-term use of opioids.