valacyclovir and Drug-Hypersensitivity

Herpes simplex virus and varicella zoster virus reactivation can occur in up to 32% and 40% of patients, respectively in the first year post-transplant without prophylaxis. Antiviral therapy consisting of acyclovir or valacyclovir is recommended for at least 1 year post stem cell transplant per evidence-based guidelines.. In the event of a contraindication or hypersensitivity reaction to either drug, an alternative is essential based on the proven efficacy in reducing clinically significant herpes simplex virus and varicella zoster virus reactivations. We report two cases of successful initiation of famciclovir in stem cell transplant recipients experiencing hypersensitivity to valacyclovir or acyclovir.. In both cases, there were no hypersensitivity reactions or breakthrough viral infections after famciclovir initiation but this observation is limited by a small patient population.. Due to the limited data available, famciclovir appears to be a reasonable option in immunocompromised patients with a mild valacyclovir or acyclovir hypersensitivity reaction.

Topics: 2-Aminopurine; Acyclovir; Antiviral Agents; Drug Hypersensitivity; Famciclovir; Female; Humans; Immunocompromised Host; Middle Aged; Stem Cell Transplantation; Valacyclovir; Valine

Topics: Acyclovir; Antiviral Agents; Basophils; Drug Hypersensitivity; Female; Flow Cytometry; Herpes Genitalis; Humans; Hypersensitivity, Immediate; Lymphocyte Activation; Middle Aged; p38 Mitogen-Activated Protein Kinases; Phosphorylation; Skin Tests; Valacyclovir; Valine

Topics: Acyclovir; Antiviral Agents; Drug Eruptions; Drug Hypersensitivity; Female; Humans; Injections, Intravenous; Middle Aged; Valacyclovir; Valine