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In page Korsakoff syndrome:

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It was once assumed that anyone with KS would eventually need full-time care. This is still often the case, but rehabilitation can help regain some, albeit often limited, level of independence.[1] Treatment involves the replacement or supplementation of thiamine by intravenous or intramuscular injection, together with proper nutrition and hydration. However, the amnesia and brain damage caused by the disease does not always respond to thiamine replacement therapy. In some cases, drug therapy is recommended. Treatment typically requires taking thiamine orally for 3 to 12 months, though only about 20 percent of cases are reversible. If treatment is successful, improvement will become apparent within two years, although recovery is slow and often incomplete.[citation needed]