I give several B12 injections a day as a community nurse and it is rare to have a bad reaction however this sounds definitely like an adverse reaction and if someone reported this I would not give any more until it had been checked by the GP. There is a yellow card warning system for medications and this would need reported on that. Occasionally it can be the batch that is the problem.
Good Morning Friday 21st August 2026
Formal letters using my first name
Rupert Lowe and the “rowers” haha


