Thanks for your comments. The breakfast is the most convenient time of the day to take the medicine for most people because their stomach is generally empty at that time. The medication is recommended to be used at that time of the day because it was studied and approved by the FDA to be used at that fashion. This is why the package insert of the drug states this as the time to use it.
In my opinion it is OK to take it at any time of the day as long as it is the same time and on an empty stomach. The practical difficulty, however, is to know how empty is the stomach at that time.
I modified my blog to clarify it better. Thanks again for your comment.
I Brook MD