We had an old boy that was on warfrin or as he put it rat posion due to clotting after a nasty accident.
He couldn't fly on a JAR PLL but was able to get a NPPL under those rules. The medics wern't happy at all about it.
He was very sensitive to altitude changes and rarely went above 1500ft and didn't fly on low pressure days. He tended to take a safety pilot with him anyway.
I ain't a medic just a pilot and it all seemed a bit dodgy apart from the bloke in question was extremely sensible about it all. He loved flying and was a great member of the club.
If you do fly your going to have to be extremely carefull, the guy did get forced up to 5000ft by wx once and ended up in hospital afterwards.
Personally I think I would have got another hobby but I know how it is.
And the gentleman in question was proved right and he passed away not recovering from a general for an op nothing to do with flying.