The medication Byetta is used to treat Type II Diabetes. There is no clinical evidence that Byetta causes hair loss. However, many people taking Byetta complain of hair loss while taking the medication. One possible contributing factor is Byetta effects hormone levels which in turn can lead to hair loss. Hormones can cause hair to become brittle and lead to breakage. Also, stress related to Type II Diabetes can also be a contributing factor in hair loss. If you are experiencing hair loss while taking Byetta you should consult your doctor. Your doctor will be able to better diagnose what is actually causing your hair loss.