At 50 300mg a wk is a cycle. Even at a younger age. Things like elevated prolactin, estrogen etc could effect erection.
Two options, drop down to 50-60mg 2x a wk. That’s a better dose for you. Then you most likely wouldn’t need an AI.
But if you need to stay on 300mg, get a new doc as he has not clue what he’s doing. Or buy and AI like Arimidex from a sponsor.
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