11.   Early indications are that the effects last for months.

12.   He believes that his is a once-in-a-lifetime treatment, and that the effects last indefinitely.

13.   He is hopeful, however, that the effect will last for days, if not weeks.

14.   He says that some studies have found that antidepression drugs increase left prefrontal cortex activity, although there is no research yet on how long the effects last.

15.   However, the reversal of symptoms was not complete and despite continued injections the effects lasted only a few days.

16.   In future trials, they will test how long the effect lasts.

17.   Its effects can last for years, even throughout a lifetime.

18.   Its effects last only as long as the drug is being administered.

19.   Letvin said he is continuing to monitor how long the effects last.

20.   Not everyone can take the new medications, and no one knows how long the positive effects will last.