Hi, may I answer your health queries right now ? Please type Hello,My mother gets heartburn a lot and some family friends told her to take yeast. She didnt know there was a difference in yeast and took active rapid rising yeast. She took it for 4 days last tuesday-friday. Since Saturday, she hasnt been able to eat or drink anything because she feels horrible, she says almost like a, you ate way too much kind of feeling. She wanted to know what the side effects were or what she should do. Thank you for your time.