How to Monitor
The following monitoring information is adapted from the practice of Apple Bodemer, MD, a board-certified dermatologist at the University of Wisconsin (Madison, Wisconsin) who also is fellowship trained in integrative medicine.
There is a paucity of published data about LDN dosing for inflammatory skin diseases. However, prescribers should be aware that LDN can alter thyroid hormone levels, especially in patients with autoimmune thyroid disease. If a thyroid-stimulating hormone (TSH) level within reference range has not been noted in the last year, consider screening with a TSH test and also assessing for a personal or family history of thyroid disease. If the TSH level is within reference range, there generally is no need to monitor while treating with LDN. Consider checking TSH levels every 4 months in patients with thyroid disease while they are on LDN therapy and be sure to educate them about symptoms of hyperthyroidism.
Side Effects
Low-dose naltrexone has a minimal side-effect profile with self-limited side effects that often resolve within approximately 1 week. One of the most commonly reported side effects is sleep disturbance with vivid dreams, which has been reported in 37% of participants.1 If your patients experience this side effect, you can reassure them that it improves with time. You also can switch to morning dosing to try and alleviate sleep disturbances at night. Another possible side effect is gastrointestinal tract upset. Importantly, there is no known abuse potential for LDN.1 To stop LDN, patients should be stable for 6 to 12 months, and there is no need to wean them off it.
Cost and Availability
Because use of LDN in dermatology is considered off label and it is not approved by the US Food and Drug Administration to treat any medical conditions, it must be prescribed through a compounding pharmacy, usually without insurance coverage. The monthly cost is approximately $30 depending on the pharmacy (unpublished data), which may be cost prohibitive for patients, so it is important to counsel them about price before starting treatment.
Final Thoughts
Low-dose naltrexone is an alternative treatment option that can be considered in patients with inflammatory skin diseases. It has a favorable side-effect profile, especially compared to other systemic anti-inflammatory agents; however, additional studies are needed to learn more about its safety and efficacy. If patients ask you about LDN, the information provided here can guide you with how it works and how to prescribe it.