Originally Posted by contango

I get lightheaded if I work hard on the bike and don't take on enough food and water during the ride. If I've really overdone it I can find myself needing to keep my head down when I stand up or I feel faint. Then I eat and drink some and it goes away. Of course the best solution is to eat and drink enough while moving that it doesn't happen in the first place.

That said...



If you've got exercise-related ailments and are on medications you need advice over and above what a bunch of random (and largely uninformed) strangers on the internet can give you. Most of us aren't doctors and the chances are none of us are your doctor, so anything we say is worth what you paid for it. If anything the things we say could be worth less than what you paid for them, on the basis badly informed medical advice can be dangerous as opposed to just useless.

Talking to your doctor has to be the way to go.