[123Ellen]

On the gatwick security advice it says you can take over 100ml of medication with prescription or doctors note (I would maybe take both or at least the doctors note).

I would maybe keep it in the box so that it is all together and ask them at security as you go through what they would want you to do with it place it in bags or if they can scan it in the box. I know that my friend had to take a single bottle of medicine that was over the 100ml and they didn't make her put it in a plastic bag.