We hypothesize that metformin co-administered with olanzapine will be well tolerated and
associated with significantly less insulin resistance, weight gain and dyslipidemia as
compared to olanzapine plus placebo.
Increased risk of metabolic complications with olanzapine therapy, relative to other
antipsychotics, may lead clinicians to avoid its use, despite evidence of greater efficacy.
These problems may also pose a therapeutic dilemma for patients who respond well to
olanzapine. Metabolic complications negatively impact on morbidity and mortality, impair
quality of life and increase illness relapse secondary to medication non-compliance. Thus
far, no pharmacologic agent co-administered with olanzapine has proven effective at
preventing these untoward effects. The present study proposes to examine the efficacy and
safety of metformin to attenuate the metabolic side effects associated with olanzapine.
- Diagnosis of: Schizophrenia, Schizoaffective Disorder, Bipolar I or II or major
depression with psychotic features who will be started on or who have just started
taking Olanzapine (Zyprexa).
- Patients with either a history of diabetes mellitus or a baseline FBG>126 or two
random blood sugars of > 200 or during a OGTT glucose level of > 200 two hours after
a glucose load of 50 grams. (All American Diabetes Association criteria for diabetes
- Baseline liver function tests (SGOT, SGPT, AP) greater than 3X normal.
- Chronic alcoholism
- MDRD less than 60 ml/1.73 m2. Modification of Diet in Renal Disease (MDRD) Equation
estimates the glomerular filtration rate as a measure of kidney function. This
equation takes into account the plasma creatinine, age, race and gender, and is a
more accurate estimation of glomerular filtration rate than serum creatinine alone.
- Patients with unstable medical problems, including cardiovascular instability or
significant congestive heart failure (as determined by study investigators).
- Prolonged QTc greater than 430 ms on baseline EKG.
- History of lactic acidosis.
- History of hypoglycemia.
- Current treatment with metformin or other antidiabetic agents.
- Treatment with any antihyperlipidemic medication within 3 months of randomization.
- Treatment with olanzapine or clozapine within 3 months of randomization.
- Concurrent treatment with ziprasidone, risperidone, quetiapine or aripiprazole or any
other neuroleptic medication.
- Concurrent use of OTC chromium, gymnema or cimetidine will be prohibited. Patient
may discontinue these medications up to one day prior to randomization.
- Current treatment with corticosteroids.