This medication has been very effective for me, who suffers from nausea on a frequent basis and does not know yet for a 100% cause of it. It is possibly anxiety.
Anyway, one side effect this medication causes for me is constipation. But a lot of different medications cause that. If you are constipated, start taking fish oil. It makes stools softer and more regular.
Another side effect is drowsiness but that goes away after a while of taking the medication.