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Most doctors advise against taking olanzapine with alcohol, as the interaction between the substances can lead to serious medical risks. Olanzapine, along with other psychoactive drugs, has the potential to strengthen the effects of alcohol in an individual's brain, resulting in abnormal function. There is also the possibility of the interaction affecting the patient's cardiovascular health. Although some doctors might allow patients some leeway in taking olanzapine with alcohol, it is only after rigorous testing and in minimal amounts. In general, it is best to avoid alcohol while under olanzapine to minimize health risks.

Olanzapine and alcohol both have depressant qualities; taking the two together can have a cumulative effect. Patients who take olanzapine with alcohol are prone to bouts of severe drowsiness and confusion, both of which could increase the risk for physical harm. Some experts believe that a combination of the two substances could result in comas or death when taken in significantly large amounts. The combination could also lower an individual's blood pressure to abnormal levels, causing problems in the circulatory system. One of the rarer side effects of olanzine is negative liver function, which could be worsened by regular alcohol consumption.

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