The literature has been reviewed for contact dermatitis from topical antiviral drugs. 15 agents have been identified including acyclovir, imiquimod, podophyllin, podofilox, cidofovir, penciclovir, vidarabine, idoxuridine, trifluridine, tromantadine, lamivudine, interferon intralesional injections and ophthalmic solution, fomivirsen and foscarnet intravitreal injections and ganciclovir intraocular implants. Patch testing has been documented in certain individuals and cross-sensitization has been observed to contribute significantly to some allergic reactions.Key words: antiviral drugs; contact dermatitis; patch test; adverse cutaneous reactions; cross-sensitivity; medicaments. C Munksgaard, 2001.
Accepted for publication 4 December 2000Adverse cutaneous reactions following topical or injectable administration of antiviral drugs are an uncommonly observed entity. For the most part, skin eruptions are mild and transitory; however, systemic manifestations of varying intensity can occur and may sometimes be serious in nature. Even more rarely observed is the associated contact dermatitis following occupational or therapeutic exposure. Information concerning this aspect of antiviral therapy is sparse and scattered throughout the medical literature. A review of the available data identifies 15 agents including acyclovir, imiquimod, podophyllin, podofilox, cidofovir, penciclovir, vidarabine, idoxuridine, trifluridine, tromantadine, lamivudine, interferon intralesional injections and ophthalmic solution, fomivirsen and foscarnet intravitreal injections and ganciclovir intraocular implants.Epidemiological studies have indicated seroprevalence rates to herpes virus vary from 1% in college freshmen in Columbia, South Carolina, to 9% in women attending a student health center at the University of Washington, to 22% of women attending family planning clinics in Pennsylvania, to 46% of women attending a sexually transmitted disease clinic in Seattle, Washington (1). Human papillomavirus types 6,11,16,18,31,33,35,39,45, 51 and 52 have been found in the cervical epithelium of 50% of sexually active women (2). Types 6 and 11 account for 80% of genital condylomas; whereas, types 16 and 18 account for 80% of cervical cancers in the USA and UK. Thus, considering the number of individuals who receive antiviral chemotherapy, substantial potential exists for adverse cutaneous and contact related reactions to occur.
Documented CasesAcyclovir Phlebitis and erythema occurred in 16% of individuals receiving acyclovir intravenously (3). Severe local inflammation leading to necrosis of the skin has occurred from extravasation of intravenously administered acyclovir and has been considered a toxic reaction (4). However, a recent observation was suggestive of an immunologically based mechanism, as evidenced by histological examination indicative of a leukocytoclastic vasculitis (5). Approximately 1% of these individuals have manifested encephalopathic changes including lethargy, obtundation, tremors, confusion, hallucinations, seizures and com...