How does anyone who needs medication for chronic conditions ever go abroad then?
That's precisely why I think the GPs here, if indeed they are GPs, are making it up as they go along. The NHS website directs people to their GP to discuss and obtain anti-malarials. If these GPs are telling the truth, they would be operating illegally (it's now a GMC requirement to hold liability insurance, so if they knowingly prescribe without insurance they're acting outside their registration) to even breath a word about anti-malarials, because by definition that's treatment abroad.
And of course, if they are claiming a problem in this case is treatment abroad, what about plane flights within the UK? Does the alleged safety issue with such anti-anxiety drugs (all this tripping and falling) apply to train travel as well?
It's all sounds rather confused, to put it mildly. Nothing in the BNF. Nothing on the MDU website.
I don't have a dog in this fight, because I fly happily with no more than a cup of coffee if it's an early flight. But I do object to professionals dragging out an increasingly implausible sequence of "a man down the pub says it's 'elf 'n' safety, can't even play conkers without the HSE coming around" stuff.
If it's medically contra-indicated, fine. It doesn't say that in the BNF, though, there should be a citation for this advice. So far all we've got is some vague stuff about the "British Aviation Authority" (sic), which I guess is the CAA. I'm not sure why doctors would think the CAA can tell them how to prescribe, as they don't regulate, or purport to regulate, doctors.