I have not used Spiriva so I am unsure of its dosage, but I have taken
ipratropium which is in the same class. As a
neb solution it lasts 6 hours and as an MDI it last 4 hours. Check your prescription for dosing on this medication.
Advair is a combination medication used to treat COPD and asthma. It has two active components a cortocosteroid (antiinflamatory) AND an LABA (long acting beta2 agonist that lasts 12 hours). Beta2 agonists are the broncho-dilaters.