As needed, but it's fine to take daily with no negative downsides. I'll take it before I need to go do something which might have triggered an attack, but the

As needed, but it's fine to take daily with no negative downsides. I'll take it before I need to go do something which might have triggered an attack, but the long term benefit here is that doing those activities without getting triggered lessens the sensitivity to the trigger (if that make sense). So lately I haven't taken any in weeks, but when I was first prescribed it I took it every day.