Olanzapine (Zyprexa)

What olanzapine is

Olanzapine is a medication sold under the brand name Zyprexa. It works on dopamine and serotonin, two of the chemical messengers nerve cells use to communicate, helping to steady signals involved in mood, thinking, and how the brain filters experience. It comes as a tablet and as a tablet that dissolves on the tongue.

What it treats

Your clinician might suggest olanzapine for one of these, among other possible off-label uses:

• Schizophrenia
• Bipolar disorder, for manic or mixed episodes and to help keep things steady over time

It is sometimes combined with another medication for certain kinds of depression, and it is not approved for behavior problems in older adults with dementia, where medicines in this group can carry serious risks. Whether it is a good fit for you depends on several factors, including your history and what you are working on. As with everything in psychiatry, that is decided case by case.

How it works

Honestly, no one knows with complete certainty how olanzapine produces its benefit. What robust research supports is that it works by steadying the activity of dopamine and serotonin, messengers involved in mood, thinking, and how the brain filters experience. The biology is only part of the picture: how much a medication helps, and how it feels, is individual. Two people on the same medication can have very different experiences.

How to take it

There is no single right way to take olanzapine; it depends on you and your clinician. It is taken once a day, with or without food, and is often taken in the evening because it can be calming. The plan you and your clinician make together is the one to follow, not a number you read online. A few general points apply broadly:

• Take it the way you and your clinician agreed. For the kind that dissolves on the tongue, use dry hands and let it dissolve rather than swallowing it whole.
• If you miss a dose, ask your clinician or pharmacist what to do rather than doubling up.
• Try not to stop on your own. Your clinician can guide any change, and stopping a medication like this is best done thoughtfully rather than all at once.
• Because olanzapine can affect weight, blood sugar, and cholesterol, your clinician will usually check these now and then. This is routine monitoring, and it is one of the more useful things to stay on top of with this particular medication.

What to expect

This varies from person to person. Some effects can show up before the benefit does: possible side effects, if they happen, often appear early, while the full benefit can take longer, sometimes a few weeks or more depending on what you are treating. That early stretch is common and tends to ease. If nothing has shifted after a fair trial, that is useful information, not a dead end, and there are other options. As always, this is case by case.

Side effects

Not everyone gets side effects, and many that do happen ease over the first weeks. The lists below are possibilities, not certainties.

Possible more common side effects:

• Feeling drowsy, tired, or calm, especially early on
• Increased appetite and weight gain
• Dizziness or feeling lightheaded when standing up
• Dry mouth or constipation
• Restlessness or a feeling of needing to move
• Changes in periods, or breast tenderness or discharge

If any of these stick around or bother you, they are worth raising. Send a non-urgent message through the patient portal or bring it up at your next visit; often a small change helps.

Less common, but concerning side effects that could require emergency care:

• Signs of an allergic reaction: rash, hives, or swelling of the face, lips, tongue, or throat, or trouble breathing or swallowing
• A rash with a fever, swollen glands, or swelling of the face, which can be a sign of a serious reaction
• A high fever with stiff muscles, confusion, heavy sweating, and a fast or irregular heartbeat, which can be a serious reaction that needs prompt care
• Uncontrollable or unusual movements of the face, mouth, tongue, arms, or legs
• Tightening of the neck muscles, or trouble swallowing
• A seizure
• Signs of very high blood sugar, such as being very thirsty, urinating often, or feeling confused or unusually drowsy
• Any new or worsening thoughts of harming yourself

For any of these, use the help options at the top of this page: call 911 or go to the nearest emergency department for a medical emergency or severe reaction, or call or text 988 for a mental health crisis.

When to reach out, and where

For routine questions, side effects that can wait, or how things are going, send your clinician a message through the patient portal. These are part of your ongoing care and are answered in the normal course of a few business days, so they are best for things that are not urgent.

If something feels urgent, you do not need to wait for a reply. The help options at the top of this page are the fastest way to get care: 911 or the nearest emergency department for a medical emergency or severe reaction, or 988 any time for a mental health crisis or thoughts of self-harm.

Questions to ask your clinician

• What are you hoping olanzapine will help with in my case?
• How and when will we know if it is working?
• How will we keep an eye on weight, blood sugar, and cholesterol?
• What should I do if I notice side effects?
• What is the plan if this one turns out not to be the right fit?
• How will we handle stopping it, if and when we get there?