What happens when the Hospira UK Ltd vincristine sulfate 1 mg/ml solution for injection product contacts furosemide in a syringe or sequentially through a Y-site without flushing?

The Hospira UK Ltd vincristine sulfate 1 mg/ml solution for injection product undergoes immediate precipitation when mixed with furosemide in a syringe or administered sequentially with furosemide through a Y-site without flushing between injections.