New City Osaki Clinic homepage > Frequently asked questions > Question 4
The major advantage of immune cell therapy is that it does not cause severe side effects.
On the day of the first and second administration, however, one in five patients has a fever ranging from 37.5ºC to higher than 38ºC.
Fever does not develop on the day after the administration.
Fever is transient and resolves in one or two hours even without treatment. So, you do not have to worry, but we prescribe Calonal just in case patients develop a fever.