I would suggest preloading with milk thistle 2 weeks before your cycle though as to prepare your liver.
I hope you are educated on this pro hormone and you have a proper PCT. If you don't know what I'm talking about,start researching.
Also, consider pre-loading Hawthorne Berry for a week or two, its known to cause an initial spike in blood pressure.
@ Brahmin. Example of the 4 hour time window (because no disrespect, but it sounds like you need one):
8 AM: First Halodrol dosage
Noon: N2Guard/Milk Thistle
4 PM: Second Halodrol dosage
8 PM: N2Guard/Milk Thistle
I'm not saying to follow this exactly, like Axillist said before, adapt it to your schedule but for maximum androgen absorption try to keep that 3.5-4 hours in between dosing the halo and the milk thistle.