Ketamine is sometimes offered for the treatment of chronic pain. Usually, this is in the form of an IV infusion. Ketamine treatment for pain should be prescribed by a doctor experienced in treating acute and chronic pain with ketamine.
The use of ketamine in patient-controlled analgesia for hospital patients with acute pain is common worldwide.
Low-dose oral ketamine has been used for pain with some success in trials, however its use is not generally advocated by physicians treating chronic pain and the evidence for its use is inconsistent.