A lot of doctors have this reflex view of hydroxychloroquine that it is an ‘immunosuppressant’. This is because of its utility in ‘autoimmune conditions’.
What they don’t realise is that ‘autoimmune’ is science fiction. It’s a Wrong Theory. The condition is, instead, crypto-immune: caused by a hidden (crypto-) pathogen. Hydroxychloroquine works, not by turning the immune system off, but, rather, by killing the hidden pathogen.