The invention discloses WNK signalling inhibitors, in particular closantel, for use in the prevention and treatment of disorders caused and/or characterized by elevated levels of serum fibroblast growth factor (FGF23), especially chronic kidney disease (CKD). The invention also provides pharmaceutical compositions comprising one/or more WNK signalling inhibitors and methods for use said pharmaceutical compositions in the treatment of subjects diagnosed with FGF23-associated disorders, wherein subjects may be humans and/or companion animals, e.g. dogs and cats.
