The mean relative FEV1 across the combination dose groups returned toward baseline during the post-treatment 28-day washoutperiod.
FORBES: Personalized Cystic Fibrosis Drugs Get A Booster Shot
2.
To get around this potential problem, the University of Pennsylvania study only examined studies without a washoutperiod.
FORBES: Health Care
3.
Dug studies also may overestimate benefits of antidepressants because many drug studies have a placebo "washout" period, which attempts to exclude people likely to respond to a placebo.