Sides for me are very mild, but I definitely have read a wide variety of sides ranging from none to pretty bad digestive issues. Right now I'll get mild nausea but that's it, it's nothing serious and usually lasts 30 min and just once or twice a day when I get very hungry. It's odd I don't feel hungry per se but slightly nauseous and if I eat a light snack it goes away, just have to be smart and not eat junk. The hunger suppression is strong and I get full extremely fast and stay full for about 6 hours.
I actually just ordered tirz from stan too so excited to see how that works. I can post my response once I try it.