If you take 60mg of codeine all at once, it is more likely to cause some side effects. One of the side effects is that you may become very sleepy, feel dizzy, or have problems with breathing. Whenever a medicine reaction like the one described here happens, it is best to remain calm and save your life without increasing the doses further. In addition, it is recommended to stay hydrated, sit down, and be observant of the body's feelings for possible encounters.