Almost from the day in 1995 that GlaxoSmithKline introduced Flonase, it was a runaway hit. The nasal spray alleviated seasonal allergy symptoms without causing drowsiness, and Americans (50 million of whom have allergies) clamored for a prescription. Flonase did $600 million in sales by 2000, and in 2005 raked in $1.3 billion.
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