I to- ugersundersøgelserne hos ældre patienter afkortede Zerene 5 mg ofte indsovningstiden i forhold til placebo, mens Zerene 10 mg altid gav kortere indsovningstid end placebo.
In elderly patients, the time taken to fall asleep was often decreased with Zerene 5 mg and was always decreased with Zerene 10 mg, when they were compared with placebo in the two-week studies.