Is the child's tetany caused by a drug allergy?

Patient's question:

1
Patient is male, 6 years old, previously healthy. Five days ago, he developed a cold with fever, sore throat, and swelling. He was given Xiao'er An Fen Huangna Ming Granules and Cephalosporin Granules orally. Fever subsided after three days. However, he experienced restless nights and convulsions of hands and feet for two consecutive days.

Doctor's answer:

Hello, based on the symptoms, it does not seem to be a drug allergy. If it were a drug allergy, an allergic reaction would typically occur with the first oral dose. Therefore, I suggest checking for fever, or whether it is caused by factors such as calcium deficiency.