Starting Strattera 40 MG tomorrow.

I am starting Strattera 40 MG for the first time tomorrow. I was on Vyvanse for 5 weeks and the side effects didn't sit well with me. One major one was ED so I am concerned that this will happen with Strattera. I'm wondering if 40 MG is too high to start. I am in the 45-55 age bracket. I am not sure what to expect from this med so any advice would be appreciated. Especially on the ED front. I hope this doesn't mess with my sex drive and ability to perform.