Calcipotriol and 5-Fluorouracil Combination Therapy for the Treatment of Actinic Keratosis in the Clinic: A Review Article

This review examines the pharmacology, efficacy and safety, dosage and administration, and place in therapy of the combination of 5-fluorouracil (5-FU) and calcipotriol for the treatment of actinic keratosis. Currently, 5% 5-FU topical cream is approved for actinic keratosis treatment, while calcipotriol is indicated for plaque psoriasis in adults. The typical administration of 5-FU involves topical application twice daily for up to 4 weeks, whereas calcipotriol is applied in a thin layer once or twice daily as directed by a physician. Adverse effects of 5-FU are primarily localized, including skin irritation, ulceration, pruritus, erythema, crusting, and eczematous reactions due to minimal systemic absorption. Calcipotriol may cause burning, itching, and skin irritation. This review details clinical trials that investigate the innovative approach of combining topical 5-FU with calcipotriol for actinic keratosis treatment, highlighting the significant outcomes. Notably, the clinical trials indicate that all participants experienced either a reduction in lesion size or complete lesion clearance, with minimal adverse effects impacting treatment success. The combination of 5-FU and calcipotriol effectively treats actinic keratosis by enhancing the immune response and targeting cell overgrowth, while reducing local site reactions and the lengthy treatment time often associated with existing therapies.