Is Ondem MD Advisable For Nausea And Morning Sickness?

Is there a difference between Ondem 4 mg and Ondem MD-4? I am 12 weeks pregnant, I was adviced Ondem 4 mg by my Gynae in my 8th week, I am still taking it, because the nausea won t stop. My Chemist did not have Ondem 4 mg so he gave me Ondem MD -4. Is it OK to use Ondem MD 4 for nausea and morning sickness?