Why is 1,1,1-trichloroethane or methyl chloroform in the K11 white round pill called HYDROXYZINE HCL

... 25 MG tablets? I was just prescribed these which is a generic Atarax to replace my generic Vistaril. I am fearful in trying these pills since Google search revealed that it contained an inert pesticide that is mildly toxic to humans. And the pesticide was called 1,1,1-trichloroethane or Methyl Chloroform.