Triamcinolone acetonide is a synthetic corticosteroid and about 8 times more potent than prednisone. 1 The metered-dose nasal spray is a thixotropic formulation, containing triamcinolone acetonide suspended in a water-based medium. 2 Each delivered dose of spray contains 55 micrograms (mcg) of triamcinolone acetonide. 3