Does deltasone (prednisone) increase testosterone in man?

No. Deltasone is a brand of prednisone. While Prednisone is a steroid, it is a corticosteroid, not a sex steroid w/anabolic & androgenic properties, like testosterone. Taking Prednisone should have no impact on your testosterone production, at least not for the average person who isn't deathly ill and in need of a stress dose/boost. You can shut down acth w/o affecting lh in your pituitary.