for how long does chemotherapy excrete
However, because repeated, long-term exposure to chemotherapy drugs can result in severe health problems, some precautions are necessary. A small amount of chemotherapy may be excreted in your petâs urine and feces for up to 72 hours after a dose of chemotherapy is given. It is important to avoid contact with your petâs urine or feces during this time. If your pet has an accident in the house, wear dishwashing gloves when cleaning it up. 1  Wipe up the waste first and then clean the area with a mild soap and water solution three times using disposable paper towels. Place these materials in a plastic bag and dispose of them in an outside/garage trash receptacle.