Side Effects of codeine: A Synthesis of Findings from 22 Studies
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This analysis is based on research papers included in PubMed, but medical research is constantly evolving and may not fully reflect the latest findings. There may also be biases towards certain research areas.
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Major Research Findings
Codeine is a drug used to relieve pain, but it can also have some side effects. 20 , 14 , 4 , , 8 , , 2 Many studies have investigated the side effects of codeine. These studies report nausea, vomiting, constipation, drowsiness, dizziness, respiratory depression, and dependence as side effects of codeine.
Reasons for Side Effects
Codeine is an opioid analgesic similar in structure to morphine. Opioids relieve pain by binding to specific receptors in the brain, but they can also cause side effects such as nausea, vomiting, and constipation by binding to these receptors. Also, codeine is metabolized in the liver and converted to morphine. This morphine can further cause these side effects. 15 , 5 , 4 , 21
Common Side Effects
Nausea and vomiting
Codeine can cause nausea and vomiting. 15
Constipation
Codeine can cause constipation. 21
Drowsiness
Codeine can cause drowsiness. 20 , 4 , , 16
Dizziness
Codeine can cause dizziness. 20 , 4
Respiratory depression
Codeine can cause respiratory depression. 21
Dependence
Codeine can be addictive. 14 , 4 , , 8
Other
In addition to the above side effects, codeine can cause rash, itching, indigestion, headache, nervousness, mental changes, etc. 15
Countermeasures for Side Effects
Nausea and vomiting
If you are concerned about nausea and vomiting, you can reduce the symptoms by taking codeine before meals or eating small, frequent meals. 15
Constipation
If you are concerned about constipation, it is important to eat foods high in fiber and drink plenty of fluids. If necessary, you can also ask your doctor to prescribe a laxative. 21
Drowsiness
If you are concerned about drowsiness, you should be careful not to drive or operate machinery after taking codeine. 20 , 4 , , 16
Respiratory depression
If you are concerned about respiratory depression, it is important to talk to your doctor. 21
Dependence
You need to be aware of the dependence of codeine. If you take codeine for a long time, you may become addicted. 14 , 4 , , 8
Comparison of Studies
Commonalities of Studies
Many studies have shown that codeine can cause side effects such as nausea, vomiting, constipation, drowsiness, dizziness, respiratory depression, and dependence. 20 , 14 , 4 , , 8 , , 2
Differences in Studies
The incidence and severity of side effects of codeine vary from study to study. This is thought to be due to differences in the age, health status, and dosage of the study participants. Also, drug interactions between codeine and other drugs can change side effects. 20 , 14 , 4 , , 8 , , 2
Precautions for Application to Real Life
Codeine is a highly effective pain reliever, but it is important to consider the risk of side effects. When taking codeine, it is important to follow your doctor's instructions carefully and follow the instructions for use and dosage. Also, if you experience any side effects such as nausea, vomiting, constipation, drowsiness, dizziness, or respiratory depression while taking codeine, consult your doctor immediately. 20 , 14 , 4 , , 8 , , 2
Limitations of Current Research
There is still not enough research on the side effects of codeine. In particular, further research on the long-term effects of codeine is needed. 20 , 14 , 4 , , 8 , , 2
Future Research Directions
Further research on the side effects of codeine is needed. In particular, detailed investigations on the long-term effects of codeine and the interactions of codeine with other drugs are needed. 20 , 14 , 4 , , 8 , , 2
Conclusion
Codeine is a highly effective pain reliever, but it is important to consider the risk of side effects. When taking codeine, it is important to follow your doctor's instructions carefully and follow the instructions for use and dosage. Also, if you experience any side effects such as nausea, vomiting, constipation, drowsiness, dizziness, or respiratory depression while taking codeine, consult your doctor immediately. 20 , 14 , 4 , , 8 , , 2
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