Memory loss - is it related to ADD? Meds for ADD? Or something else?

New concern with ADD DH- he is experiencing memory loss. He claims that he doesn't recall specific conversations that we have.  Conversations that I know we have had -some that are important, others more conversational - it doesn't matter - he really doesn't recall them taking place.  Sometimes, I can relay some of the conversation to him and he may recall or he may not. He is frustrated and concerned with this issue. He is taking Dextroamphetamine XR and Prozac and some other meds for health issues.  Could this be a result of the med's interacting? Is this memory loss common with ADD?  He has made an appointment with his primary care doctor for this week to discuss this issue.