The fixed combination HP 0.01%/TAZ 0.045% lotion used by the patient in this case report has additional efficacy and safety benefits. The new polymeric emulsion technology used to develop HP/TAZ lotion allows for efficient permeation of the active ingredients into the dermal layers, at around half the concentration of traditional topical formulations.10 Further, HP/ TAZ lotion has demonstrated synergistic activity, with efficacy greater than that which would be predicted from the individual active ingredients.10 The maintenance of therapeutic effect seen in this patient—who sustained disease reduction 4 weeks posttreatment—is likely due to the mechanism of action of TAZ in psoriasis, which restores skin to a quiescent, prelesional status.27 However, when used alone, TAZ can cause cutaneous irritation; HP alone can also result in AEs that limit long term use. These safety limitations can be minimized when combining HP with TAZ.10,11 The patient in this case report did not report any adverse events—including any application or irritation events— and local skin reactions were limited. Though the patient was limited to 8-weeks of HP/TAZ treatment as part of the clinical trial design, treatment with HP/TAZ for up to 1 year (maximum 24 weeks of continuous use) in an open-label, long-term study (NCT02462083) has demonstrated a favorable safety profile.28
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