in BREO
Pronunciation: vye-LAN-ter-ol


What it isLong-acting beta-2 agonist, marketed only in combination; asthma and COPD.
Why this oneOnce-daily duration, which the older LABAs do not achieve.
What limits itNever as monotherapy in asthma. Tachycardia and hypokalemia at high dose; CYP3A4-dependent.
NO BOXED WARNINGS
Principal riskTachycardia and hypokalemia; never as monotherapy in asthma
Defining liabilityCardiovascular stimulation and unsafe asthma monotherapy