Humulin regular can be used as a bolus insulin at meal time with Levemir as a basal. However, it is not recommended (or FDA approved) to be mixed together. Some health care providers use NPH/Regular at breakfast, regular at dinner and Levemir at bedtime to avoid the potential for lows overnight. Some also my use Levemir at Breakfast, regular at breakfast (separate shot), regular at dinner and Levemir at bedtime. Hope this helps.
Dr.Cogen
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