What could cause changed behaviour while being off zyrtec?
Patient: my grandson is on zyrtec when we accidentally skip a dose he has a horrible day at school acting out, etc another child at school experiences same issues. why would this happen. he has no visible symptoms of allergies that would be causing discomfort. Doctor: Welcome at HCM    I have gone through your query and being your physician i completely understand your health  concerns.what is his age? For how long he is suffering from?  Is he  running fever? A Is he asthmatic? why he is using zyrtec?    As far as ZYRTEC is concerned it use for in allergic conditions , as well as to prevent the allergic attack. The abnormal change in behavior which u are talking about , i don't see any association between these two.      You better meet PEDIATRICIAN  so  that he can be properly assessed.             Zyrtec normally should not be use for prolonged periods since it has got its own side effects .  Meanwhile stay calm     May he get well soon Hope your query is adequately addressed if you still have any feel free to ask   RegardsDr Saad Sultan