Delayed hypersensitivity reactions


See Drug reactions , Erythema multiforme and Stevens-Johnson syndrome .

DESCRIPTION

Broad spectrum of clinical manifestations involving different organs, including liver, kidneys and skin. Cutaneous reactions are most prevalent and range from maculopapular or morbilliform rashes (most common presentation), to life-threatening cutaneous reactions such as Stevens-Johnson Syndrome/toxic epidermal necrolysis (SJS/TEN). Common drugs associated are antiretrovirals (efavirenz or nevirapine), anticonvulsants, anti-tuberculous therapy, penicillins and co-trimoxazole.

GENERAL AND SUPPORTIVE MEASURES

Stop the suspected causative medicine(s) immediately. Use an alternative class of agent if required.
If there are compelling reasons to continue with the suspected medicine, seek expert advice.

Severe cutaneous reactions will usually require admission and intensive supportive therapies. See Erythema Multiforme and Stevens-Johnson Syndrome .

MEDICINE TREATMENT

Mild reactions without systemic or mucosal involvement may be treated symptomatically:

  • Chlorphenamine, oral, 0.1 mg/kg/dose 6 hourly.

REFERRAL

  • SJS/TEN for management in a specialist centre with experience or a unit familiar with managing burns.