Last time I drank ayahuasca with huambisa/chaliponga (contains 5-meo-dmt) I vomited every 5-10 minutes for about 4 hours. It was horrible, and I had to ask for help because I couldn't even get up and refill my water bottle. Chacruna is more gentle and smooth.
Drink pomegranate juice and eat some ginger 20 minutes before. That stops any nausea with Ayahuasca for 6-8 hours, it evens "fix" the horrible taste to many.
I think it’d be counterproductive to stop the nausea, when nausea is an integral part of the Ayahuasca process of letting go, in addition to crying, yawning, sweating, etc. I just listen to my body and let it do its thing; sometimes I need to purge, sometimes I don’t need to purge.
The purge isn't necessary for healing, shamans use your physical purging as an anchor to help you emotionally purge, but that's just another technique.
It stops the nausea, but you still can purge (can't tell why). But it feels that you are just cleaning your body. And without nausea you can listen, IMHO, to your body, more carefully
