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A member asked:

Is it possiable for ur body to become immune against promethazine. i am 14 weeks pregnant n it prescribe by my doc. it help for a while but not it not?

A doctor has provided 1 answer
Dr. Gregory Hines answered

Specializes in Family Medicine

Tolerance: Phenergan (promethazine) should not be used continuously, as you could develop tolerance to it. It should only be used for extremes of morning sickness, and only if Reglan does not work, as it is generally considered safer.

Answered 6/30/2014

5.9k views

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