Although Seretide products are no longer included in the formulary, there will be patients who are stable on these inhalers. Please remember that Seretide Accuhaler ® is designed to be administered as one blister per dose because each blister contains 50micrograms of salmeterol. Patients should never be prescribed 2 blisters (or 2 puffs) per dose of an Accuhaler ® eg. 2 puffs twice daily. This is an overdose of salmeterol. In contrast, Seretide Evohaler ® should be administered as two puffs of the approprate inhaler strength because each puff only contains 25micrograms of salmeterol per dose.