PMR & GCA people should read up on this matter. Quite often we don't read the Patient Information leaflet which is provided by the manufacturer or we are given the medication first and then read the leaflet.
1. Organisation: Public Health England
Page history: Published 23 August 2013
2. The Patient Information Leaflet (PIL) is the leaflet included in the pack with a medicine. It is written for patients and gives information about taking or using a medicine. It is possible that the leaflet in your medicine pack may differ from this version because it may have been updated since your medicine was packaged.
Para 2 What you need to know before you receive ZOSTAVAX
Line 3 if you have been told by your Doctor that you have a weakened immune system as a result of a disease, medicines and other treatment.