Managing women with nausea and vomiting of pregnancy. Canadian consensus

I have a 30-year-old pregnant patient who is asthmatic and is taking prednisone. Whenever she decreases her prednisone dose, her nausea increases tremendously even though she is taking two tablets of doxylamine and pyridoxine combination (Diclectin) daily. She is already at 26 weeks' gestation, and I really do not want her to continue the prednisone beyond what is needed for her asthma, but two attempts to taper prednisone off failed because of unbearable nausea.

Several controlled trials show the efficacy of prednisone for nausea and vomiting of pregnancy (NVP), but your case is fascinating in proving the point by challenge-rechallenge. You should try to decrease the prednisone while increasing doxylamine and pyridoxine to its recommended dose of two tablets before sleep, one in the morning, and on in the afternoon.