Q: Caspofungin may cause which electrolyte abnormality?

Answer: Hypokalemia

Beside increase liver enzymes, other rare but life threatening side effects reported so far includes severe thrombophlebitis (require a greater dilution and infusion over an extended period) and severe hypokalemia, with serum potassium levels as low as 1.7 mg/dl.

Experience with Caspofungin in the Treatment of Persistent Fungemia in Neonates - Journal of Perinatology (2005) 25, 770–777; published online 13 October 2005