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So I took robitussin last night after like reading the bottle like 10 times making sure no alcohol. None listed. However it has dextromarphan (spelling). I looked it up and it said it would give a false positive if you took like a massive quanity like 600 mg, is that true. The cough syrup has 20 mg of tand guafinissen only nothing else, every four hours. Am I screwed having taken 2 doses?