[MrWB]

But there’s a potential risk of an allergic reaction to any drug you take, any food or drink you consume, even environmental substances - perfumes; hayfever is an allergic reaction to pollens. You don’t know you have one until you have the reaction. I didn’t know I was allergic to penicillins until I needed them for an infection and it turns out I am.

[SpicyUme]

Good point, I wasn't clear. The warning was about the systemic reaction inside the veins and arteries. Or something along those lines. Whatever it was the warning struck me as much more drastic than the usual allergic reaction warning.