Though no longer the standard of care, given the low cost, low side effect profile, and possible benefit of use, it is reasonable to consider NAC use in the prevention of CIN at a dose of 600 1200 mg orally twice a day for 4 doses, starting 12 hours pre contrast and continuing post contrast exposure how to buy stromectol Some have explored the use of dual energy CT to virtually reconstruct the non contrast portion by acquiring data with two tube potentials, although this has not yet proven reliable enough for clinical use and further refinement of this technique is ongoing