Mixing bleach with urine can produce a potentially toxic gas called chloramine gas, which can cause irritation of the eyes, nose, and throat, watering eyes, and a runny nose. The sodium hypochlorite in bleach can react with ammonia in urine, producing chloramine gas. Therefore, it is not recommended to pee into a toilet that still contains bleach in the bowl, as some of the bleach may splash up onto your skin, causing skin irritation or burns. Additionally, inhaling the fumes produced by the reaction of bleach and urine can be harmful. It is important to avoid mixing bleach with other cleaning products, including ammonia-containing cleaners, acids, and other chemicals, as this can cause serious injuries.