Answer
No. Its licensed role is prevention after exposure in susceptible high-risk people, not treatment of established severe chickenpox.
Sources for this answer
- Human Varicella-Zoster Immunoglobulin — Current selected SmPCemc · Summary of Product Characteristics
- UK GovernmentUK Government · Reputable Web
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.