Remember, PD drugs often take several months to develop their full therapeutic effects and you need to be patient. Don't stop taking your medications or abruptly change your dosage without talking with your doctor first. Sometimes side effects are caused by drugs you are taking for other medical conditions. In this case your drug regimen may simply need adjustment. One of the most common side effects from PD drugs is nausea.
Nausea is also a symptom of PD itself.
For many the nausea on starting a PD medication is the reason the drug is stopped, possibly prematurely. I experienced significant nausea from nearly all the PD medications I have taken. It should be emphasized that for many people, over time, this troublesome drug induced side effect will lessen or disappear altogether Again, try to be patient and don't discontinue the drug unless the nausea is unbearable or your doctor advises it be stopped. Don't give in too soon. To reduce my almost daily nausea ,worse in the morning, I walked, took the drug with a glass of juice, ate a few crackers, or drank ginger ale.