FDA ALERT [08/12/2008]: FDA is notifying healthcare professionals of the risk of adverse injection site reactions in patients receiving naltrexone (Vivitrol). Physicians should instruct patients to monitor the injection site and contact them if they develop pain, swelling, tenderness, induration, bruising, pruritus, or redness at the injection site that does not improve or worsens within two weeks. Physicians should promptly refer patients with worsening injection site reactions to a surgeon.
