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In page Central pontine myelinolysis:

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It has also been known to occur in patients suffering withdrawal symptoms of chronic alcoholism.[3] In these instances, occurrence may be entirely unrelated to hyponatremia or rapid correction of hyponatremia. It could affect patients who take some prescription medicines that are able to cross the blood-brain barrier and cause abnormal thirst reception - in this scenario the central pontine myelinolysis is caused by polydipsia leading to low blood sodium levels (hyponatremia).[citation needed]