Adex is used for pct to simply limit (but not eliminate) estrogen so as to make the SERMs (especially clomid)'s job easier at the hypothalamus in "blocking" estrogen feedback. In order to get sufficient elimination of negative feedback with an AI, your estrogen levels would have to dip dangerously low. Estrogen has too many other necessary functions in the body to risk that. An AI is a good addition to clomid pct, but it should be used at moderate doses, with merely controlling estrogen levels in mind.