It is impossible for your healthcare provider to know whether you will develop insomnia while taking Meridia. Also, in some cases, if a person does develop insomnia, it is difficult to know whether these problems are because of Meridia or other factors.
If you develop insomnia while taking Meridia, make sure to talk with your healthcare provider. There are other treatments that he or she may be able to recommend, including adjusting the Meridia dosage or trying another weight-loss drug.