Management of FCM-Induced Itching

First-Line Topical Management

The American Academy of Dermatology recommends applying topical moisturizers containing urea or polidocanol, followed by mid-to-high potency topical corticosteroids such as prednicarbate 0.02% cream or clobetasol 0.05% for moderate to severe symptoms in patients with FCM-induced itching 1, 2
Apply skin moisturizers and urea- or polidocanol-containing lotions as the foundation of treatment to soothe pruritus in patients with FCM-induced itching 1, 2
Avoid alcohol-containing lotions or gels in favor of oil-in-water creams or ointments for patients with FCM-induced itching 1
The American Academy of Dermatology suggests applying emollients at least once daily to affected areas in patients with FCM-induced itching 1

The American Academy of Dermatology recommends adding oral H1-antihistamines such as cetirizine 10mg daily, loratadine 10mg daily, fexofenadine 180mg daily, or clemastine for relief of itching in patients with grade 2/3 pruritus that persists despite topical therapy 1, 2
Non-sedating antihistamines (cetirizine, loratadine, fexofenadine) provide relief primarily through their sedative properties rather than histamine blockade in drug-induced reactions in patients with FCM-induced itching 1, 2
Sedating antihistamines may be used at night to break the itch-scratch cycle and improve sleep quality in patients with FCM-induced itching 7

Avoid dehydrating body care such as hot showers and excessive use of soaps in patients with FCM-induced itching 1, 2
Substitute all soaps and detergents with emollients to prevent further irritation in patients with FCM-induced itching 3, 4
Reassess after 2 weeks; if no improvement or worsening occurs, escalate therapy in patients with FCM-induced itching 1, 2, 3
Monitor for signs of secondary bacterial infection (crusting, weeping), which requires anti-staphylococcal antibiotics in patients with FCM-induced itching 1, 2

Do not use topical antihistamines (such as diphenhydramine gel) as they can cause allergic contact dermatitis and drowsiness from systemic absorption in patients with FCM-induced itching 8
Avoid prolonged continuous use of potent topical steroids on the same area, which can lead to skin atrophy and steroid addiction/withdrawal in patients with FCM-induced itching 8
Avoid washing affected areas with harsh soaps, detergents, or very hot water in patients with FCM-induced itching 3, 4

Consider short-term oral systemic steroids (prednisone tapered over 2-3 weeks) for severe, extensive symptoms in patients with FCM-induced itching that persists despite 2-4 weeks of appropriate topical and systemic therapy 1, 2
Refer to dermatology for consideration of phototherapy, systemic immunosuppressants (azathioprine, cyclosporine), or patch testing to rule out contact sensitization in patients with FCM-induced itching that persists despite 2-4 weeks of appropriate topical and systemic therapy 4
Evaluate for secondary complications such as bacterial superinfection or contact dermatitis to topical medications themselves (particularly neomycin) in patients with FCM-induced itching 5, 6