A Boy Ate 25 Laxative Brownies In 1 Hour. This Is What Happened To His Kidneys.
1 Brownie = 2 tablets (50mg) sennosides = daily recommended dose
Kidney imaging isn't used for cases like this, so I can't link to any videos showing it cause there are none. Laxative "pranks" are painful and can be life threatening. Don't do it.
