Arimidex will do nothing for Deca induced gyno. Deca can give you gyno through progesterone, not estrogen. Arimidex is only effective at preventating the aromatization to estrogen.
All the 19-nortestosterone derivatives can give you gyno through progesterone: Deca, Anadrol, Trenbolone.
Also if you shoot Eod you need to adjust the doses acoordingly. 100mg EOD will not give you 300mg or 400mg a week, because one week you will be injecting 3 times, and the following week 4 times. 7 injection in 14 days, therefore 350mg a week.
All the 19-nortestosterone derivatives can give you gyno through progesterone: Deca, Anadrol, Trenbolone.
Also if you shoot Eod you need to adjust the doses acoordingly. 100mg EOD will not give you 300mg or 400mg a week, because one week you will be injecting 3 times, and the following week 4 times. 7 injection in 14 days, therefore 350mg a week.