"Mechanism of Action Oxomemazine, a phenothiazine derivative, is a sedating antihistamine"
The above information is about all I could find on this drug. If it is used in the US, I have no idea what label it's under.
Even if I had been able to find more information, I am not qualified to tell you to either stop or start or change any medications. You need to speak with your doctor or chemist for an answer to your question.
Peace
Greenlydia