The authors compared the two portions of the OFF period in patients with Parkinson disease and response fluctuations: time to ON (the latency from levodopa intake to turning ON) and wearing off (time from termination of the beneficial dose effect until the time when the next dose was taken). Time to ON was more than twice the duration of wearing off. Although underrecognized, time to ON is the major component of total daily OFF.
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Merims et al. (2003) studied this question.
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