I'm sorry, Dublinpilot, but the letter didn't say 'Please contact us if you wish to discuss it.' It was quite clear that they wouldn't accept use of cetirizine by pilots at all. I am aware of the list of possible side-effects - but having not experienced any, I know it works for me.
I'm cross because from what I have previously heard, the CAA is not flexible on this sort of thing. Perhaps if I spoke to them they would be - but that wasn't the import of the letter. I'll certainly give it a go.
I'm definitely taking it seriously - it's not just a question of a post-mortem. If I crashed but survived, I could imagine they might prosecute, especially if I killed passengers. So clearly I can't carry on taking it having received this letter.
No-one's mentioned the fact that my AME didn't pick this up...
Tim