Cutting xanax xr in halfI began cutting them in half and took only 1mg per day, and occassionally if really . . . Best Answer: DO NOT cut a Xanax XR in half. . . . . . . of alprazolam by 18%, decreased clearance by 22%, and increased half-life . However, klonopin has a much longer half life than xanax, so it will stay in your system . . . . . because those have longer onsets and last MUCH longer in the body. . . Crazy Meds Talk ver 9. . . . I suggest you to start by cutting the dosage in half ... more