Of course. Arimadex is an AI to reduce bloat and help prevent gyno. As long as you are taking your dose at the same time of the day for your arimadex, I do not see a problem.
arimidex is generally weak. its a strong suppressor of sulftase and weaker suppressor of aromatase (coupled with the fact that it like letrozole upregulates aromatase production- likely because they suppress sulftase so strongly though also probably because they are competitive inhibitors and not suicidal).
some people love arimidex, though generally most people prefer aromasin or AIFM. then there are people that need letrozole (high level suppression of both sulftase and aromatase- though a steroidal AI taper is reccomended with letro to prevent rebound)
its likely that people that respond well to arimidex do not produce much aromatase or experience little upregulation of aromatase (from any stimulus) and their primary issue is with sulftase conversion.
i use adex & AIFM.. in my 4th week (2nd week of adex, 3x's a week/1-2 pumps AIFM throughout) of a test only cycle.. no problems at all, been making great gains & sex drive has even improved.. just my 2 cents