Is singulair safe to take long-term? can it cause churg-strauss syndrome? on and off it for 3 years, only drug that clears up mucus in nose and throat

Considered safe: All medications have potential side effects, some of them severe, and Singulair is no exception. Churg-Strauss is among those possible effects. However, Singulair is considered on the safer end of the spectrum. Naturally, the longer you are on a medication, the more likely it is that a side effect would occur, but there are no specific recommendations against long-term use of Singulair.