sudafed
shouldn't have a problem with that unless you over dose on it.
i have been taking it for years whilst flying. an FAA doctor in anchorage, AK introduced me to it and i have used it since then. some times more than others. but have never had any questions at all after blood tests. and have always told the doctors and examiners about it- sudafed non drowsy. even no problem with the blood tests in korea, belgium or now in the UK.
cheers;