Can Droxidopa be used for augmenting orthostatic hypotension treatment in patients who are already on midodrine and/or fludrocortisone?

I routinely combine droxidopa with fludrocortisone just as I would midodrine and fludrocortisone when orthostatic hypotension is refractory to tolerated doses of monotherapy.

The use of droxidopa and midodrine is something I do less commonly, or frankly just rarely. They compete for the same recept...