Diclegis and Tinnitus

Does anyone have any info on this drug? It's used as an anti-nausea drug for women during pregnancy. My wife is pregnant and started taking it and upon taking it, she said she felt like she was less nauseous but her ringing got louder.

I can't seem to find much info on this. Can it cause permanent damage to the ear? I know one of the side effects is ringing in the ears, but I can't seem to find whether or not it is just temporary.