I remember something about beta blockers (propranalol specifically? not sure) being tested to reduce the vividness of memories after trauma to prevent PTSD. The idea is burst of anxiety enhance memory (through adrenalin? again not sure - see my memory is toast too) anyway by blocking that effect, you'd reduce the occurrence of PTSD in theory.

That of course is about memory of trauma. I don't know if it affects all memory. But it's interesting to think about. Have you looked at the side effect profile for your medications? Maybe they mention it.