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Codeine is an opioid analgesic that is often provided to patients for the treatment of pain associated with surgical procedure, injury or certain types of illness. This medication is a Schedule II Controlled Substance according to the DEA. This means that there is a substantial risk for abuse of the drug and that such use can be dangerous. Recognizing the signs of a Codeine high can help you to determine whether someone you love may be in some sort of trouble.
Confusion
Confusion is one of the more common signs of a codeine high that is noticed by outsiders. The individual may not realize what he or she is doing. He may act out of place or do something that doesn’t quite seem to fit in with what’s going on. If you notice a loved one who is acting confused, confront him or her about whether a drug may have been taken.
Lethargy and Fatigue
Someone who is high on codeine may show drowsiness and confusion.
Codeine, like other opiates, can cause strong lethargy in the user and will often result in fatigue. The individual may seem like he or she has very heavy limbs that are difficult to pick up. They may slouch or walk very slowly as if they are not in a hurry to get very far.
Labored Breathing
According to Medline Plus, Codeine use can lead to shallow or labored breathing that is dangerous for the user. If you suspect that someone you love has taken Codeine, and you notice that the individual is having trouble breathing, contact 911 immediately. Shallow or slow breathing can lead to reduced oxygen in the body, primarily to the brain, and may cause stroke, seizures or death. Look for bluish lips, fingernails or bluing to the skin to determine if someone you love may be suffering from a potential overdose on Codeine.
Mood Changes
Codeine use can cause an array of mood changes. Significant, inexplicable mood changes are common when an individual is high on codeine. The mood changes may be more noticeable when the individual does not have codeine; this is a sign that the individual is developing a dependence on the drug and that further help should be sought.
Itching
Codeine, heroin, and other opiates are notorious for causing the user to scratch and itch. If you notice an individual chronically acting as if he or she is itchy all over, opiates may be to blame. Often times, the itching sensation is reduced with time and tolerance but in early use, itching is one of the more common signs of a codeine high.
Symptoms of Codeine Dependence -
Codeine is an opioid narcotic analgesic that is recommended in the treatment of mild to moderate pain and coughs. In short term treatments, codeine may cause a relatively minor physical dependence. However, in long term use or abuse, it can cause a harsher physical dependence as well as psychological dependence which may increase the risk ... 
Health Risks of Codeine Abuse -
Contrary to popular belief codeine can be dangerous if it is abused. Codeine abuse has been on the rise in the United States and is widely used by teenagers and young people because it is so easily accessible. Codeine is prescribed for pain but it may also be prescribed to treat diarrhea and coughs that ... 
Telltale Codeine Overdose Symptoms -
Codeine is a narcotic pain-reliever, much like hydrocodone but in liquid form. This drug numbs the receptors to the brain that initiate pain signals when you are hurt. Codeine slows down your entire system including breathing and the process of thinking. Codeine must be prescribed by a doctor. If the medication is used when not ... 
Overdose Symptoms -
In rare but potential cases, codeine overdose can occur. The symptoms of codeine overdose may include: difficulty breathing excessive drowsiness or sleepiness losing consciousness losing muscle tone cold & clammy skin fainting or passing out reduced heartbeat bluish lips weakness weak pulse gastrointestinal problems including spasms low blood pressure seizures Before You Call 911 If ...