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As is typical of opioids, common side effects include constipation, itchiness, and nausea. [12] Serious side effects may include hallucinations, seizures, increased risk of serotonin syndrome, decreased alertness, and drug addiction. [12] A change in dosage may be recommended in those with kidney or liver problems. [12]
This requires them to increase their drug dosage to maintain the benefit, and that in turn also increases the unwanted side effects. [78] Long-term opioid use can cause opioid-induced hyperalgesia, which is a condition in which the patient has increased sensitivity to pain. [101] All of the opioids can cause side effects. [70]
A genetic basis for the efficacy of opioids in the treatment of pain has been demonstrated for several specific variations, but the evidence for clinical differences in opioid effects is not clear. [11] There is an estimated 50% genetic contribution to opioid use disorder.
The effects of morphine will likely be more pronounced in opioid-naive subjects than in chronic opioid users. In chronic opioid users, such as those on Chronic Opioid Analgesic Therapy (COAT) for managing severe, chronic pain, behavioural testing has shown normal functioning on perception, cognition, coordination, and behaviour in most cases.
Opioids, such as fentanyl, morphine, and oxycodone, are used to treat post-surgery pain and chronic pain. [6] Opioids work by affecting the brain cells and reducing the perception of pain. [7] Other side effects include euphoria, mood changes, and the clouding or complete loss of consciousness. [8]
Its effects last for about four to six hours. Codeine exhibits abuse potential similar to other opioid medications, including a risk of addiction and overdose. [4] Common side effects include vomiting, constipation, itchiness, lightheadedness, and drowsiness. [4] Serious side effects may include breathing difficulties and addiction. [4]
Opioid-induced hyperalgesia (OIH) or opioid-induced abnormal pain sensitivity, also called paradoxical hyperalgesia, is an uncommon condition of generalized pain caused by the long-term use of high dosages of opioids [1] such as morphine, [2] oxycodone, [3] and methadone. [4] [5] OIH is not necessarily confined to the original affected site. [6]
Main side effects of oxycodone [43] Two tablets (10 mg) of oxycodone and safety blisters. The most common side effects of oxycodone include reduced sensitivity to pain, delayed gastric emptying, euphoria, anxiolysis (a reduction in anxiety), feelings of relaxation, and respiratory depression. [44]