Calcipotriol – Uses, Mechanism & Side Effects
Calcipotriol is a synthetic vitamin D analogue used topically to treat plaque psoriasis. It works by reducing abnormal skin cell growth and suppressing inflammation in affected areas.
Things worth knowing about "Calcipotriol"
Calcipotriol is a synthetic vitamin D analogue used topically to treat plaque psoriasis. It works by reducing abnormal skin cell growth and suppressing inflammation in affected areas.
What is Calcipotriol?
Calcipotriol (also known as calcipotriene in American English) is a synthetically derived analogue of vitamin D3 (cholecalciferol). It is primarily used as a topical medication – applied directly to the skin – for the treatment of plaque psoriasis, the most common form of psoriasis. It is available in various formulations, including ointments, creams, solutions, and foams.
Mechanism of Action
Calcipotriol binds to the vitamin D receptor (VDR) found in skin cells, regulating gene expression and influencing several key processes:
- Inhibition of keratinocyte proliferation: In psoriasis, skin cells (keratinocytes) divide abnormally fast. Calcipotriol slows down this excessive cell division.
- Promotion of keratinocyte differentiation: It supports normal skin cell maturation, helping restore a healthy skin appearance.
- Anti-inflammatory effects: Calcipotriol modulates the activity of immune cells in the skin, particularly T-lymphocytes, reducing the inflammatory component of psoriasis.
Compared to natural vitamin D3, calcipotriol has a significantly reduced effect on calcium metabolism, which greatly lowers the risk of hypercalcaemia (elevated blood calcium levels) when used as directed.
Indications
Calcipotriol is primarily used for:
- Plaque psoriasis (psoriasis vulgaris): The most common form of psoriasis, characterized by red, scaly, and inflamed skin plaques.
- Scalp psoriasis: Available in solution and foam formulations specifically designed for use on the scalp.
Dosage and Application
Calcipotriol is typically applied once or twice daily as a thin layer to the affected skin areas. The recommended maximum weekly dose for adults is generally 100 g of the ointment formulation (equivalent to 5 mg of calcipotriol per week), in order to avoid systemic effects on calcium metabolism. Treatment duration and exact dosage should always be determined by a healthcare professional.
Calcipotriol is also widely used in combination products with topical corticosteroids (e.g., betamethasone dipropionate). This combination takes advantage of the synergistic effect of both active ingredients and may enhance efficacy compared to monotherapy.
Side Effects
Calcipotriol is generally well tolerated, but may cause the following side effects:
- Local skin irritation: Burning, itching, redness, or dryness at the application site – the most common side effect.
- Contact dermatitis: In rare cases, allergic or irritant contact reactions may occur.
- Hypercalcaemia: If the recommended maximum dose is exceeded or calcipotriol is applied to very large body surface areas, blood calcium levels may rise. Symptoms can include fatigue, nausea, or cardiac arrhythmias.
- Facial skin and skin folds: Calcipotriol should not be applied to the face or sensitive body areas such as skin folds, as it may cause increased irritation in these regions.
Contraindications and Interactions
Calcipotriol should not be used in patients with:
- Known disorders of calcium metabolism (e.g., hypercalcaemia, hypercalciuria)
- Severe renal or hepatic impairment
- Application to the face, skin folds, or extensive body surface areas beyond recommended amounts
Drug interactions are rare due to the low systemic absorption associated with topical application. Caution is advised when using calcium-elevating supplements or vitamin D supplementation concurrently.
References
- Mrowietz U. et al. – S3 Guidelines for the Treatment of Psoriasis Vulgaris, AWMF Register No. 013-001, 2021.
- Lebwohl M. – Calcipotriene and betamethasone dipropionate aerosol foam in the treatment of psoriasis. Journal of Drugs in Dermatology, 2016.
- European Medicines Agency (EMA) – Product Information for Calcipotriol, www.ema.europa.eu.
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