Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Drugs withheld prior to commencement of protocol.
| Long acting beta agonists | For 12 h |
| Beta-2-agonists | For 6–8 h |
| Singulair (leukotriene-receptor antagonist) | For 4 days |
| Sodium cromoglycate and nedocromil | For 8 h |
| Antihistamines | For 72 h |
| Inhaled corticosteroids | For 12 h |
| Caffeine (cola, chocolate, coffee, tea) | For 8 h |
| Strenuous exercise | For 6 h |
