Managing Brain Fog on Naltrexone
Understanding the Context
- The American Gastroenterological Association notes that nausea is a common side effect of naltrexone, occurring in 4.6%–9.6% of patients 1
- The American Gastroenterological Association reports that vomiting is a side effect of naltrexone, occurring in 0.7%–2% of patients 1
- The American Academy of Family Physicians states that headache is a side effect of naltrexone, occurring in 0.9%–1.8% of patients 5
- The American Gastroenterological Association notes that dizziness is a side effect of naltrexone, occurring in 0.7%–1.4% of patients 1
Practical Management Approach
- The American College of Physicians recommends assessing for depression or anxiety in patients taking naltrexone, as psychiatric symptoms can manifest as cognitive dulling, with anxiety occurring in 0.6%–5.4% of patients and depression occurring in 0.1%–1.3% of patients 1
- The American Academy of Sleep Medicine suggests evaluating sleep quality in patients taking naltrexone, as insomnia can occur with naltrexone-bupropion combinations 4
- The Endocrine Society recommends checking for metabolic causes of brain fog in patients taking naltrexone, such as undiagnosed thyroid dysfunction or vitamin deficiencies 4
- The American Academy of Family Physicians notes that the bupropion component of naltrexone-bupropion combinations may cause cognitive effects in some individuals, and recommends considering dose adjustment or timing modification to minimize sleep disruption 5
- The American College of Clinical Pharmacology states that oral naltrexone has a 4-hour half-life with an active metabolite lasting 13 hours, and extended-release injectable naltrexone has prolonged effects lasting weeks 5, 6
- The American Academy of Family Physicians recommends considering dose reduction if the patient is on higher doses of naltrexone, and discussing with the prescribing physician whether a lower dose might maintain therapeutic benefit while reducing side effects 6
- The American College of Physicians suggests taking naltrexone at a consistent time that minimizes impact on daily cognitive demands, and considering discontinuation if brain fog significantly impairs quality of life or daily functioning 5