oxycodone + paroxetine + quetiapine

This is a **combination of three pharmaceutical drugs**—oxycodone, paroxetine, and quetiapine. - **Oxycodone** is a semisynthetic opioid analgesic primarily acting as an agonist at the mu-opioid receptor, used for the management of moderate to severe pain. - **Paroxetine** is a selective serotonin reuptake inhibitor (SSRI) antidepressant that increases synaptic serotonin levels, used to treat major depressive disorder, anxiety disorders, and other psychiatric conditions. - **Quetiapine** is an atypical antipsychotic that primarily blocks serotonin 5-HT₂A and dopamine D₂ receptors, used for the treatment of schizophrenia, bipolar disorder, and as adjunct therapy in major depressive disorder[3][6][9]. **Mechanistically, combining these agents has been studied for their potential interaction specifically regarding respiratory effects:** - Both **quetiapine** and **paroxetine**, when combined with **oxycodone**, have been shown in clinical and animal studies to **increase the risk of respiratory depression compared to oxycodone alone**[1][2][4][5][7][10]. - The enhanced respiratory depression is thought to be partly due to pharmacokinetic interactions increasing oxycodone exposure, but paroxetine in particular produces a synergistic pharmacodynamic effect leading to a greater-than-expected decrease in ventilatory response to hypercapnia[1][2][4][5][7][10]. - This combination does not have a unique brand or proprietary formulation and is not standard therapy; rather, its clinical importance lies in the notable risk for dangerous respiratory depression when these medications are co-administered.