I've recently been prescribed 20mg Prozac instead of my daily 30mg Cymbalta, to hopefully help with the relentless fatigue.

I understand Cymbalta is SNRI, and Prozac SSRI.

Can I clean switch to Prozac? Do I start Prozac whilst tapering off Cymbalta? Or do I taper off Cymbalta entirely first, then start with Prozac?