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I wouldn't throw the word "cause" around that much, my prefered word and probably a more accurate one is "triggered"
 

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I have already posted in another thread where you posted about this and suggested it may be fluoride in the drugs that can mess up your thyroid. But there can be other culprits as well such as lacking a certain enzyme to metabolize or detox the drugs from your system.

CYP2D6 is one such enzyme that is involved in the metabolism of numerous drugs, amongst others atomexetine. I've already seen a docu where people lacking a certain enzyme can have a whole range of health issues induced by certain anesthesia, so it may be a similar thing with certain drugs related to certain enzymes and the lack thereof.

CYP2D6 polymorphism: implications for antipsychotic drug response, schizophrenia and personality traits.

Abstract

The CYP2D6 gene is highly polymorphic, causing absent (poor metabolizers), decreased, normal or increased enzyme activity (extensive and ultrarapid metabolizers). The genetic polymorphism of the CYP2D6 influences plasma concentration of a wide variety of drugs metabolized in the liver by the cytochrome P450 (CYP) 2D6 enzyme, including antipsychotic drugs used for schizophrenia treatment. Additionally, CYP2D6 is involved in the metabolism of endogenous substrates in the brain, and reported to be located in regions such as the cortex, hippocampus and cerebellum, which are impaired in schizophrenia. Moreover, recently we have found that CYP2D6 poor metabolizers are under-represented in a case-control association study of schizophrenia. Furthermore, null CYP2D6 activity in healthy volunteers is associated with personality characteristics of social cognitive anxiety, which may bear some resemblance to milder forms of psychotic-like symptoms. In keeping with this, CYP2D6 may influence, not only variability to drug response, but also vulnerability to disease in schizophrenia patients.
 

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More on this enzyme:

CYP2D6 is one of the most important detox enzymes. It is responsible for the clearance of 20% of clinical drugs, including opioids (codeine, tramadol), antitumor drugs (tamoxifen), antidepressants (fluoxetine), and antipsychotics (haloperidol). In addition, this enzyme also metabolizes dopamine and serotonin. Therefore, it doesn't come as a surprise that the activity of this enzyme can be associated with human personality, behavior traits, and psychiatric disease susceptibility. Read on to find out more about CYP2D6 function, gene variants, and supplements that increase or decrease enzyme activity.
 
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