Figure 1.

Intravenous flucloxacillin treatment is associated with a high incidence of hypokalaemia. A, Hypokalaemia was more frequent in patients on flucloxacillin than ceftriaxone treatment. Most patients developing hypokalaemia were female. B, after treatment, serum potassium levels were lower in patients on flucloxacillin treatment than ceftriaxone treatment (mean, SD). C, Histogram showing the distribution of potassium levels during treatment and D, the change in potassium level during treatment. ∆ delta, defined as change from baseline to follow‐up; K⁺, potassium; ns, nonsignificant