Can the saliva of a venomous lizard help you control your blood sugar? Surprisingly, yes! If you have Type 2 diabetes, you may be familiar with and . They both contain exenatide, the synthetic form of a substance found in the saliva of the Gila monster. Byetta and Bydureon BCise are now the two available formulations for exenatide. But how are they different? And is one better than the other? What are Byetta and Bydureon BCise used for? Byetta and Bydureon BCise are injectable medications.