Hi everyone! I am 24 years old and I am a college student. Now to my problem I have a very sensitive throat which is very much susceptible to seasonal allergies. I am having cough and cold for the past 5 days now. My mother had brought me a syrup yesterday from chemist and it contained guaifenesin along with codein. I know all about codein but I am not sure about guaifenesin so I want to learn from people about guaifenesin side effects and precautions?