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Olanzapine is an atypical antipsychotic medication that is commonly used to treat conditions such as schizophrenia and bipolar disorder. One of the well-documented side effects of olanzapine is weight gain. This occurs due to several mechanisms, including increased appetite and changes in metabolism that can lead to fat accumulation.

Patients on olanzapine often notice an increase in their weight over time, which can be significant. This side effect is particularly concerning as it can contribute to other health issues, such as cardiovascular disease and type 2 diabetes. Consequently, monitoring weight and implementing lifestyle changes are essential components of treatment for individuals prescribed olanzapine.

While drowsiness, dry mouth, and constipation can also occur with olanzapine, they are generally less prominent or considered secondary effects when compared to the risk of weight gain. This makes weight gain a key side effect that clinicians need to be aware of when prescribing olanzapine, ensuring proactive management strategies are in place for patients.