Localised reactions at the injection site are common.
Men B immunisation - recommended 3 doses of paracetamol due to likelihood of fever, first dose only
Systemic effects are less common but may include pyrexia, crying and irritability, drowsiness, inability to sleep, reduced appetite, diarrhoea, and vomiting. Older children may complain of muscular pain, headaches, and drowsiness.
Neurological effects such as dizziness, febrile convulsion, fainting, numbness, and hypotonia are very rare.
Anaphylactic reactions are reported to occur in about 1 in 500,000 doses of MenC vaccine given.
There is a potential risk of apnoea after MenC is given to very premature babies (<28 weeks) and respiratory monitoring should be considered for 72 hours after administration.