Treatment of Drug-Induced Generalized Rash

Initial Assessment and Management

The American College of Allergy, Asthma, and Immunology recommends discontinue the suspected causative drug immediately if the reaction is severe, and assess severity based on body surface area affected, presence of systemic symptoms, and organ involvement 1, 2
Obtain bacterial cultures when infection is suspected or when there's failure to respond to initial treatment, as recommended by the American Academy of Dermatology 1, 3

For mild rash, the American College of Allergy, Asthma, and Immunology recommends applying topical low/moderate potency corticosteroids to affected areas, and using non-sedating antihistamines for daytime pruritus and sedating antihistamines for nighttime itching 1, 4
For moderate rash, continue topical corticosteroids and add oral antihistamines, and add oral antibiotics for 6 weeks if papulopustular features are present, as recommended by the American Academy of Dermatology 1, 4, 5
For severe rash, the American College of Allergy, Asthma, and Immunology recommends systemic corticosteroids, and consider hospitalization for extensive involvement, systemic symptoms, or if Stevens-Johnson syndrome/toxic epidermal necrolysis is suspected 1, 2, 4

For xerotic and eczematous rash, avoid hot showers and excessive use of soaps, and apply emollients at least once daily to the whole body, as recommended by the American Academy of Dermatology 6
For pruritus/itching, apply moisturizers and urea- or polidocanol-containing lotions, and use systemic H1-antihistamines such as cetirizine, loratadine, or fexofenadine 6

Avoid skin irritants such as OTC anti-acne medications, solvents, or disinfectants, and avoid excessive sun exposure, as recommended by the American Academy of Dermatology 1, 4
Document the reaction to prevent future re-exposure to the causative agent, as recommended by the American College of Allergy, Asthma, and Immunology 7

The British Journal of Pharmacology recommends discontinuing the offending drug immediately if there is mucosal involvement, blistering, exfoliation, or intolerable pruritus, as the reaction may temporarily worsen after drug cessation, particularly with longer half-life medications 8
Critical warning signs requiring immediate drug discontinuation include mucosal involvement or blistering, elevated liver enzymes, and progressive constitutional symptoms, according to the British Journal of Pharmacology and the Annals of Internal Medicine 8, 9

About 50% of mild-to-moderate antiretroviral-associated rashes resolve spontaneously despite continuation of therapy under close supervision, as reported by the British Journal of Pharmacology, and certain experienced clinicians recommend managing mild rashes with antihistamines without drug discontinuation, though this approach has been questioned by the Annals of Internal Medicine 8, 9

The British Journal of Pharmacology and the Annals of Internal Medicine advise against using prophylactic corticosteroids or antihistamines to prevent hypersensitivity reactions to nevirapine or other NNRTIs, as this has not proven effective and may actually increase the risk of developing rash 8, 9
Rechallenge with the offending drug can lead to serious and possibly fatal reactions, occurring much sooner than on first exposure, as reported by the British Journal of Pharmacology, and therefore, rechallenge is rarely attempted 10