How soon after taking Emend will my symptoms improve?

Emend (aprepitant) is a preventive medication and should be taken one hour prior to chemotherapy and three hours prior to surgery. If taken properly, your symptoms of nausea and vomiting should not occur or will be reduced following these medical events. Do not take Emend if you are currently experiencing these symptoms. Emend cannot improve nausea symptoms once they begin.

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