Brycanil is Terbutaline and Theodur is Theophylline, so as mentioned I took T&T together with Singulair -- and I believe that so do other patients, especially since, as I said, Singulair doesn't have many side effects.
The larger question is whether T&T with or without Singulair help stop or prevent episodes of SCLS. For some patients, they seem to do that. For others, they do not -- which is why in Europe, and now in North America, more patients are transitioning to IVIG.
Prednisolone and Prednisone have been found to be effective in stopping episodes, but because they are steroids and they have serious side effects over time, no doctor is likely to recommend taking steroids over many months and years to prevent episodes of SCLS. However, as mentioned, they can be useful in dealing with episodes as they happen.