I receive a prescription guaifenesin codeine syrup today and just opened the bag which says to take 1 to 2 teaspoon by mouth 4 to 6 hours. I also received an antibotic which upset my stomach so I did not want to take them together. The bottle is only 2/3 full down, above 6 mark, just under 200 mark of the the bottle, or to the line where the label is affixed. This is the first time that I received a syrup that low. Is this the norm or is it unusual. Thanks. Brenda Jones