Fluphenazine in Treating Patients With Refractory Advanced Multiple Myeloma

DISEASE CHARACTERISTICS:

* Histologically or cytologically confirmed multiple myeloma

  * Advanced disease
  * Must be refractory to ≥ 2 different methods of standard treatment
* Measurable disease, defined as serum paraprotein ≥ 1g/L or urine light chain ≥ 200 mg/24 hours
* No brain involvement or leptomeningeal disease
* No spinal cord compression unless the following criteria are met:

  * Patient has undergone prior surgery or radiotherapy
  * Neurological findings are ≤ grade 1
  * Patient is off steroids for spinal cord edema or is on a stable regimen of ≤ 10 mg/day of prednisone or equivalent

PATIENT CHARACTERISTICS:

* ECOG performance status (PS) 0-2 (ECOG PS 3 allowed if related to skeletal lesions)
* Life expectancy ≥ 12 weeks
* Absolute granulocyte count ≥ 1,000/mm\^3\*
* Platelet count ≥ 50,000/mm\^3\*
* Hemoglobin ≥ 8.0 g/dL\* (no transfusion within the past 7 days)
* AST and ALT ≤ 2.5 times upper limit of normal (ULN)
* Bilirubin ≤ 2 times ULN
* Creatinine clearance ≥ 30 mL/min
* LVEF ≥ 40%
* QTc \< 450 msec
* No evidence of dysrhythmias on EKG
* Not pregnant or nursing
* Negative pregnancy test
* Fertile patients must use effective contraception
* No congestive heart failure
* No angina pectoris
* No cardiac arrhythmia
* No uncontrolled hypertension, defined as systolic blood pressure (BP) \> 180 mm Hg and/or diastolic BP \> 105 mm Hg
* No myocardial infarction within the past year
* No active infection
* No HIV, hepatitis B, or hepatitis C infection
* No history of psychosis
* No history of subcortical brain damage
* No hypersensitivity to fluphenazine hydrochloride or other phenothiazines
* No history of seizures or extrapyramidal symptoms
* No other serious illness or medical condition
* No other malignancy within the past 5 years except adequately treated nonmelanoma skin cancer or carcinoma in situ of the cervix NOTE: \*Patients with values outside of this range due to infiltration by myeloma may be allowed at the discretion of the investigator

PRIOR CONCURRENT THERAPY:

* See Disease Characteristics
* Recovered from prior therapy
* At least 21 days since prior chemotherapy, immunotherapy, or radiotherapy
* At least 21 days since prior and no concurrent systemic steroids

  * Patients who have been taking chronically administered steroids for ≥ 1 month at a dose ≤ 10 mg/day of prednisone or equivalent are eligible
* At least 28 days since prior investigational agents
* At least 6 weeks since prior selective serotonin reuptake inhibitors (SSRIs) (a wash-out period equivalent to 5 times the terminal elimination half-life is required for tricyclic antidepressants or norepinephrine reuptake inhibitors)
* No concurrent SSRIs, tricyclic antidepressants, or norepinephrine reuptake inhibitors
* No concurrent dialysis therapy
* No concurrent hematopoietic growth factors except epoetin alfa

  * Treatment with hematopoietic growth factors may be started during study if patient develops or has progressive cytopenia
* No concurrent anticholinergics or other antipsychotics
* No concurrent antiseizure drugs except Neurontin for treatment of neuropathy