Which of the following is an adverse effect of β2 agonists: (A) Hypoglycemia, (B) Hypomagnesemia, (C) Hypophosphatemia, (D) Hypokalemia
Answer is D. β2 agonists cause a brief spell of hyperkalemia followed by hypokalemia.

These do not cause hypoglycemia. However, β2 blockers delay the recovery from hypoglycemia.