The traditional treatment for hearing voices in western medicine has been prescription drugs.
You should never change or stop medication without consulting your doctor.
However, psychiatrists, psychologists and psychotherapists are increasingly using talking therapies to explore the meaning of the voices. This works by understanding the messages for the individual in what the voices are saying and cultivating more helpful responses to them. Eleanor Longden explains this very clearly in the video below.
Another related approach is Compassion Focused Therapy. This encourages us to develop the compassionate side of ourselves alongside the sad or angry parts.
The Voices in my Head – Eleanor Longden (YouTube video)
Compassion therapy for voice-hearing
From ABC in Australia: Tapping into your compassionate self as an approach to therapy for voice hearing and psychosis (audio link).
Compassion for Voices: a tale of courage and hope
(video from the Cultural Institute at Kings).
A new (2019) website which aims to make it easier for people to find information about different approaches to voice-hearing and ways of supporting those who are struggling with the voices that they hear.
Hearing Voices Network
HVN supports people who experience voice hearing, visions, tactile sensations and other sensory experiences. Their support includes providing self-help groups and a telephone line for information and help (web link).