Sinicuichi (Heimia salicifolia) is a shrub from Mexico which is used by some Mexican shamans as a tool for divination.
Sinicuichi doesn't seem to have any consistently reported effects. Some users experience physical discomfort.
10 grams should be enough to make a tea from.
Some users have reported unpleasant side-effects after consumption (and also the day after): heavy muscle pain, aching joints, exhaustion, headache.