Calcipotriol, also known as calcipotriene, is a synthetic vitamin D analog used in the treatment of various skin disorders. It has a chemical structure similar to that of 1,25-dihydroxyvitamin D3, which is the active form of vitamin D3 in the body. Calcipotriol was first introduced in 1991 and has since become an important drug in dermatology.
Mechanism of action
Calcipotriol exerts its therapeutic effects by binding to the vitamin D receptor (VDR) on the surface of target cells. This complex then translocates to the nucleus, where it regulates the expression of various genes involved in cell differentiation, proliferation, and immune function. The precise mechanism of action of calcipotriol in different skin conditions is not fully understood, but it is thought to modulate keratinocyte growth and differentiation, reduce inflammation, and promote apoptosis of abnormal cells.
Pharmacology
Calcipotriol is available as a cream, ointment, or solution for topical application. It has a high affinity for the VDR, which is expressed on a variety of cell types, including keratinocytes, immune cells, and fibroblasts. After absorption into the skin, calcipotriol undergoes hydroxylation by the enzyme CYP27A1 to form its active metabolite, calcitriol. The half-life of calcipotriol in the skin is about 48 hours, and it is excreted primarily in the urine.
Conditions treated
Calcipotriol is primarily used in the treatment of psoriasis, which is a chronic inflammatory skin disease characterized by scaly, red patches on the skin. It is also used for other skin conditions, such as eczema, vitiligo, and lichen planus.
In psoriasis, calcipotriol is often used in combination with corticosteroids, phototherapy, or other systemic agents to achieve better outcomes.
Combination therapy
Calcipotriol is often used in combination with other topical agents, such as corticosteroids, coal tar, or salicylic acid, to enhance its therapeutic effects. The combination of calcipotriol and corticosteroids is particularly effective in treating psoriasis, as it addresses both the inflammatory and hyperproliferative aspects of the disease. Combination therapy may also reduce the risk of adverse effects associated with long-term use of a single agent.
Duration of treatment
The duration of treatment with calcipotriol depends on the specific condition being treated and the response of the patient. In psoriasis, it is usually recommended for use once or twice daily for up to 12 weeks, with a break of at least 4 weeks between treatment courses. Long-term use of calcipotriol may increase the risk of hypercalcemia, a condition characterized by high levels of calcium in the blood, and should be monitored closely.
In conclusion, calcipotriol is a synthetic vitamin D analog used in the treatment of various skin disorders, particularly psoriasis. It exerts its therapeutic effects by binding to the vitamin D receptor and regulating the expression of genes involved in cell growth and differentiation. It can be used alone or in combination with other topical agents and is generally well-tolerated. However, it should be used with caution in patients with a history of hypercalcemia or renal impairment. The duration of treatment should be determined by the patient’s response to therapy and the specific condition being treated.
This page is written from published research and from clinical experience in Singapore since 2012. It is for general education, not medical advice. Whether a treatment suits you, what it may achieve and what it may risk can only be established at a consultation. Dr Gerard Ee is the Medical Director of The Clifford Clinic, a private clinic in Singapore, and treatments discussed on this site are provided commercially.
Book a consultation with Dr Gerard Ee at The Clifford Clinic
Dr Gerard Ee consults and treats psoriasis at The Clifford Clinic, 50 Raffles Place, Singapore. Consultations are by appointment. Message the clinic on WhatsApp, or call 6532 2048.
