06/02/2026
Patient-Led Research Collaborative (PLRC) and RTHM Clinic recently released the Long COVID Treatment Guide to support more informed conversations between patients and their clinicians.
The guide covers over 30 different interventions. Today, we’re highlighting intravenous immunoglobulin (IVIG) and subcutaneous immunoglobulin (SCIG), immunoglobulin therapies that may be especially relevant for people with Long COVID who have developed certain types of neuropathy, ME/CFS, immune deficiency, autoimmune disease, autonomic dysfunction, or who have not responded to other therapies.
Across reviewed data, IVIG demonstrated therapeutic potential for infection-associated and immune-mediated conditions. Five papers on post-COVID small fiber neuropathy reported 60–100% response rates, and two studies on autoimmune dysautonomia reported 40–80% functional improvement. In ME/CFS, three studies reported positive outcomes, and several mechanistic or review papers supported IVIG’s immunomodulatory rationale.
In the Harvard/Stanford/OMF TREATME study, 42% of individuals with Long COVID or ME/CFS who tried IVIG/SCIG reported moderate to much better symptom improvement. The NIH RECOVER IVIG study is also underway to further evaluate efficacy in Long COVID.
As with all treatments in the guide, IVIG/SCIG should be discussed with a qualified clinician to determine whether it is appropriate for an individual case, including review of risks, contraindications, drug interactions, allergies, and potential side effects. The treatment guide is an evidence-grounded resource designed to support patients and clinicians in making informed decisions together.
Download the guide here: https://www.rthm.com/treatmentguide