Is 150mg of promethazine in day for nausea safe?

The typical recommended dosage of promethazine for nausea in adults is usually between 12.5 mg to 25 mg every 4 to 6 hours, with a maximum daily dose generally around 75 mg. Taking 150 mg in a day exceeds the standard recommendations and could increase the risk of adverse effects, such as sedation, respiratory depression, or other serious complications. It's essential to consult a healthcare professional before using higher doses. Always follow a doctor's guidance regarding medication dosages.