I Have Been Taking Omez -D For My Acidity Problem

I have been taking Omez -D for my acidity problem and I found it very effective. But the doctor suggested taking it long would have side effects. He prescribed another medicine starting "Rh.....-D"The pharmacist says he cannot read it neither do I. I am quite far from the doctor and do not have his tel. no to call. Will you please help me to identify the medicine