Linda Frances is absolutely right motiilium also goes by the name domperidone. Metaclopramide also called maxalon should be avoided it reacts adversely with pd meds
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Possibly might be related to other meds u take. Ask your specialist about trying Domperidone. Look Domperidone up in Wiki. It helps with heartburn and nausea. I take it about 15 minutes before other meds.

If you are suffering with severe nausea, it could be a side effect of your medications. Many people will tell you that you cannot take anti nausea medications with Parkinson's medications. Please check with your doctor and ask him about a medication called motillium. This was prescribed for me by Parkinson's consultants as an anti nausea medication, but you need to consult your PD doctor first, to see if there is some other reason they have not suggested it for you. Hope this helps. Linda Francis

So are you feeling any benefits from the medication at all?
,I was very sick to begin with and if I hadnt decided to stick with it for 6 months I think I would have been off it after 6 weeks, you could try the domperidone closer to meal time asThunderoad suggest

What medicines are you taking and how much

Usual other questions/Tips
constipation
Stomach Acid ok
Camomile tea settles the stomach and nibbling stem ginger cookies
PLENTY FLUID