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Seretide evohaler is an asthma inhaler which contains two medicines.One ingredient is the long-acting bronchodilator salmeterol. Salmeterol keeps your airways open and prevents asthma symptoms.The second medicine is fluticasone. Fluticasone is a corticosteroid which reduces inflammation and the swelling in your airways.Seretide is a purple inhaler and it needs to be used every day, twice daily.The Seretide Evohaler is available in three strengths, each one with 25 micrograms of salmeterol xinafoate, but increasing fluticasone propionate dosage:25 micrograms of salmeterol xinafoate, and 50 micrograms of fluticasone propionate, per inhalation.25 micrograms of salmeterol xinafoate, and 125 micrograms of fluticasone propionate, per inhalation.25 micrograms of salmeterol xinafoate, and 250 micrograms of fluticasone propionate, per inhalation.