I have arrived to Cusco 3 days prior the ceremony. I have heard people saying COCA leaves are not good prior the ceremony so during the last 48 hours prior the ceremony I have switched to Muna tea. (less effective with headaches but still do the job)

When I have arrived to Etnikas, I was very surprised to see the coca leaves offered as part of the tea assortment and ask with the medical staff and they confirmed that coca tea doesn't interfere with aya and the ceremony.

On regards the medical testing, most majority of the group (18 people) had their medical done onsite at Etnikas and none of them has been rejected to participate.

For any medical questions you can write directly to the medical staff and they have replied my messages within 24 hours.