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1. Codeine Overdose
Codeine overdose can be deadly. If a person can be treated early enough, the symptoms can be reversed, but this is not always possible. According to the NIDA, “codeine-promethazine cough syrup has been linked to the overdose deaths of some prominent musicians.”
Codeine overdose causes extreme respiratory depression. The risk of respiratory failure where the individual stops breathing and goes into a coma is very high, and “mixing with alcohol greatly increases this risk.” Codeine overdose is a serious effect of codeine addiction, and it very common in those who are addicted to the drug.
2. Relationship Problems
Codeine addiction can lead to relationship problems.
When someone becomes addicted to a substance, relationship problems occur. An individual may have issues with family members or roommates over hiding codeine. Someone may also break up with a significant other over the drug. It can be hard for a loved one to understand that the addicted individual cannot stop without help, but there is a point where understanding and support can no longer go on.
According to a study from the NCBI, “People who abuse substances are likely to find themselves increasingly isolated from their families,” partly because they want to spend time with others who abuse drugs as well. This can lead to the intense relationship problems seen in the cases of codeine addicts as well as those who abuse other substances.
3. Professional Problems
Whether the individual is a student or an adult in the workforce, codeine addiction will have a negative effect on their work life. According to the DOI, “The apathy caused by opiates can translate into an ‘I don’t really care’ attitude toward performance.” Coupled with the potential for accidents caused by dizziness and other physical effects of codeine abuse, a person could be fired from a job. A student could see their grades suffer for these same reasons. Because of codeine addiction, whatever their professional status is could be compromised or even stripped away.
4. Risky Behavior
If you are addicted to a drug, you will be more willing to perform risky behaviors. For example, some people doctor shop or get different prescriptions from different doctors in order to feed their habits. Others steal or forge prescriptions to get more codeine. Some are even willing to do physically dangerous things for more of the drug, an action called drug-seeking behavior.
Some other risky behavior might occur when the person is under the influence of codeine. They may be more likely to mix it with alcohol or other drugs, or to engage in unsafe sex or other activities. These effects can be devastating to every aspect of your life.
5. Addiction to Stronger Substances
After only marijuana and alcohol, more people abuse prescription drugs than any other type of drug in the United States today (NIDA). Abusing a drug like codeine may eventually hit a wall because of tolerance, and someone who is addicted to it may begin to take stronger drugs in order to feel their effects.
There is a real chance someone who is abusing codeine could switch to a more intense opium-based drug like heroin. Heroin becomes very addictive very quickly and can be more dangerous even than codeine when it comes to overdose and death.
Causes Effects & Dangers of Codeine Dependence -
Codeine medications are safe to use as directed with a low to moderate risk of dependence. In most cases, they are prescribed to treat short term conditions and should not be used for longer periods or in abusive ways. Codeine Uses While codeine has had a number of historical uses, it is most commonly used today ... 
Side Effects of Codeine Cough Syrup Addiction -
It has become a popular trend in recent years to abuse codeine cough syrup by mixing it with soda or alcohol. This combination, according to the University of Texas, is sometimes called lean, “for the side effect causing users to lose their coordination.” This drug has many side effect of its use and, unbeknownst to ... 
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 ... 
Side Effects of Codeine that Need Medical Attention -
Codeine exists as one of many opiate-based pain relief drugs. Unlike many prescription pain medications, codeine comes directly from the opium poppy seed plant. As one of the less potent opiate drugs, codeine became the first opiate-based medication to be sold as an over-the-counter product. In spite of its widespread availability, codeine carries the same ...