Preventative medication for flying

I'm wondering if anyone who attended the Ouch Conference at Newcastle RVI in June, can remember the name of the medication suggested to prevent high altitude triggering an attack? 

The conference was utterly invaluable, I can recommend unreservedly for any sufferers and their supporters. I would like to thank everyone who organised and contributed. As a sufferer for 15 years I have kept myself well informed about CH treatments , I thought I knew a lot - I was wrong.