Seretide Diskus 50/250 mcg is a prescription inhalation powder medication manufactured by GSK. Each dose contains 50 micrograms of salmeterol (as xinafoate) and 250 micrograms of fluticasone propionate. The inhaler device provides 60 metered doses. This powder inhalation device (Diskus) is designed for controlled delivery of the medication. Seretide and Diskus are registered trademarks owned by the GSK group of companies. The product requires a prescription and should be used as directed by a healthcare provider.