Earlier, I used to have dreams. Sometime during my depression I stopped having them. I started going to therapy and few months later I started having dreams again.
So if medication can affect the ability (?) to have dreams, can it also affect nature or tone of dreams?
Medication (and mother substances) can affect your ability to have dreams, and what they are about too. Depends a lot on the type of medication and your specific case (not everyone reacts the same to each medication), so YMMV. I’ve been in treatment for depression for over 20 years with different medications and therapy styles and definitely I saw significant differences.