I've gone red from drinking codeine linctus is that normal?
My face has turned fire truck red, will I be alright?
No, it's not normal. Sounds like an allergic reaction - you're
probably in no real danger, but it might not be a bad idea to take an anti-histamine. Low dose diphenhydramine might work, but do some research, as it potentiates opiates: and if you start feeling seriously ill, then get medical attention. You've been posting about codeine linctus for a week: look, it just doesn't get you that high, you can't stand the taste, it sounds like you've been overdoing it: it's the weakest of opiates, and what exactly are you getting out of this experiment?
No-one can tell you on a website if you're in danger from a vague symptom like 'gone bright red'. You have three choices: ride it out and hope for the best, take an anti-histamine and hope for the best, or go to casualty/ER (I assume you're in the UK) or call NHS direct and get their advice. I've never turned red from codeine, and don't know anyone else who has. It
seems unlikely that an allergic reaction with no other symptoms could cause serious problems, but there's no definite answer from such vague information. You have to gauge how bad you feel, and either risk riding it out, or go to a 24-hour pharmacy, tell them you 'accidentally' drank too much codeine and see what they advise, or go straight to an ER/casualty/department.
Neither pharmacists nor nurses will be very sympathetic, so be prepared to be looked down on, doctors will probably be more practical. But you have to decide for yourself if you need medical attention, Bluelight's not a medical resource, it's a harm minimisation forum. And for God's sake, stop drinking the shit: it's a medicore high when it agrees with you, and a total, potentially dangerous waste if you have the wrong balance of enzymes. You've been posting about this shit for a week, and it doesn't sound like you've had a single positive experience. If you stop banging your head against a wall, then it will stop hurting.
I don't mean to sound brusque, but getting into a mess over the weakest opiate out there (just about) seems pointless. Opiates don't agree with you: you're lucky, leave them alone. For now, look codeine up on rx.list and google around for side-effects/allergic reactions: you need to decide for yourself if you're in danger, no-one can diagnose you at a distance, and while I doubt you're in for more than a few hours of discomfort, I could be completely wrong. You're going to have to figure it out yourself, and if seriously worried or developing more serious symptoms, get medical help.