Yes, Zyprexa is an antipsychotic. Specifically, it belongs to the class known as atypical (or second-generation) antipsychotics. Its generic name is olanzapine, and it works by blocking activity at multiple receptor sites in the brain, particularly those involved in dopamine and serotonin signaling. This dual action is what distinguishes atypical antipsychotics from older, first-generation drugs that primarily target dopamine alone.
What Zyprexa Is Approved to Treat
Although it’s classified as an antipsychotic, Zyprexa is FDA-approved for more than just psychosis. Its approved uses include:
- Schizophrenia in adults and adolescents ages 13 and older
- Bipolar I disorder, for acute manic or mixed episodes in adults and adolescents ages 13 and older, as well as long-term maintenance treatment in adults
- Bipolar I disorder (as an add-on) alongside mood stabilizers like lithium or valproate for manic or mixed episodes in adults
- Bipolar depression, when combined with fluoxetine (an antidepressant), in adults and children ages 10 and older
- Treatment-resistant depression, also in combination with fluoxetine, for adults whose depression hasn’t responded to at least two different antidepressants
- Acute agitation associated with schizophrenia or bipolar mania, treated with the injectable form in adults
The range of uses reflects how atypical antipsychotics affect mood regulation broadly, not just the hallucinations or delusions people typically associate with the word “antipsychotic.”
How It Differs From Older Antipsychotics
First-generation antipsychotics (sometimes called “typical” antipsychotics) focus heavily on blocking dopamine receptors. They’re effective for symptoms like hallucinations, but they carry a higher risk of movement-related side effects: stiffness, tremors, and involuntary muscle contractions. Zyprexa and other atypical antipsychotics also block dopamine, but their additional effect on serotonin receptors is thought to reduce the likelihood of those movement problems. The tradeoff is a different side effect profile, particularly around weight and metabolism.
Available Forms
Zyprexa comes in several formulations designed for different situations. Standard tablets are available in strengths of 2.5, 5, 7.5, 10, 15, and 20 mg. There’s also an orally disintegrating tablet (sold as Zyprexa Zydis) in 5, 10, 15, and 20 mg strengths, which dissolves on the tongue without water. For hospital or crisis settings, a 10 mg single-dose intramuscular injection provides rapid relief from acute agitation. A long-acting injectable form called Zyprexa Relprevv, available in 210, 300, and 405 mg vials, is given every two to four weeks and must be administered in a certified healthcare facility because of the risk of a rare but serious post-injection reaction.
Weight Gain and Metabolic Effects
The most commonly discussed side effect of Zyprexa is weight gain, and the numbers are significant. In a 12-month follow-up study, participants gained an average of about 10 kg (roughly 22 pounds), going from a mean weight of 66.9 kg to 77.3 kg. Within the first month alone, 30% of participants had gained more than 7% of their starting body weight. By two months, that figure jumped to over 63%, and it remained around 67% at the one-year mark.
Cholesterol levels also shift. Over 12 months, average total cholesterol rose by about 30 mg/dL (an 18.7% increase), pushing 20% of study participants above the 200 mg/dL threshold considered elevated. Blood sugar changes were smaller but still measurable, with fasting glucose rising about 7% over the same period. Only about 6.6% of participants ended the study with blood sugar above the normal range.
These metabolic effects are a real consideration when weighing the benefits of Zyprexa against alternatives. The FDA has approved a newer formulation that combines olanzapine with a second compound designed to reduce the weight gain, offering an option for people who respond well to the drug but struggle with its metabolic impact.
Other Common Side Effects
Beyond weight gain, the most frequently reported side effects include drowsiness, dizziness, and dry mouth. Many people feel noticeably sedated, especially early in treatment. Constipation and increased appetite are also common. These effects tend to be most pronounced during the first few weeks and may lessen over time, though the sedation and appetite changes often persist for some people.
Important Safety Warnings
Zyprexa carries an FDA black box warning, the most serious type of safety alert, regarding use in elderly patients with dementia-related psychosis. Across 17 controlled studies, elderly patients with dementia who took atypical antipsychotics (including olanzapine) were 1.6 to 1.7 times more likely to die than those taking a placebo. Deaths were attributed to heart failure, sudden cardiac events, and infections like pneumonia. Zyprexa is not approved for treating behavioral symptoms in elderly patients with dementia.
Zyprexa is also not FDA-approved for children under 13 for schizophrenia or bipolar disorder, or for children under 10 when used in combination with fluoxetine for bipolar depression.
Why People Search “Is Zyprexa an Antipsychotic”
If you or someone you know was prescribed Zyprexa for depression, mood episodes, or even off-label uses like nausea or insomnia, seeing “antipsychotic” on the label can be confusing or alarming. The name of the drug class doesn’t always match the reason it was prescribed. Many atypical antipsychotics are widely used for conditions well beyond psychosis, including mood disorders, severe anxiety, and agitation. The label reflects the drug’s pharmacology and original approval pathway, not necessarily why your doctor chose it for you.