If I take 2mg of saboxone a day will it show up on a hair test

Yeah... if you were afraid of failing the test you would not take anything not prescribed to you or prohibited.

Of course it will, without a doubt.

I'm assuming you don't have a prescription for this?

If you do have a prescription, and are taking the dosage recommended by your doctor, then you simply bring in the bottle, and show that it's prescribed. Prescribed meds are okay. But if you don't have a prescription, you're screwed.

I would need more info to give a better answer. But a hair drug test is meant to show consistent use over time. Also it is possible that it won't be pick up as most labs don't test for saboxone. As an example, if the lab did test for saboxone and you were taking 2mg of saboxone a day for a month or so it is possible for you to test positive for it.