Calcipotriol

Key facts

• Calcipotriol is a synthetic vitamin D analog applied to the skin to slow the overgrowth of skin cells that causes psoriasis plaques.
• It's applied once or twice daily to affected skin only, and improvement typically appears over several weeks of regular use.
• Using more than the recommended weekly amount, or applying it over very large areas of skin, can raise your blood calcium to unsafe levels. Stick to the amount and body area your prescriber specifies.
• Seek care for persistent nausea, unusual thirst, frequent urination, or muscle cramps, which can signal high blood calcium.

What calcipotriol treats

Calcipotriol treats plaque psoriasis on the body and scalp psoriasis, conditions where skin cells multiply too fast and pile up into thick, scaly, often itchy patches. It is not a treatment for other rashes or for widespread, unstable psoriasis without medical supervision, since covering too much skin raises the risk of absorbing enough of the drug to affect blood calcium.

How calcipotriol works

Vitamin D receptors inside skin cells normally slow cell division and encourage cells to mature properly. Calcipotriol activates these receptors in the skin, correcting the overactive turnover that builds up psoriasis plaques, while being handled by the body very differently from vitamin D taken by mouth, so it has much less effect on calcium when used as directed.

Before you take it

• Avoid calcipotriol if you have a disorder of calcium metabolism or a known allergy to it.
• Tell your prescriber if you have kidney disease or are already taking vitamin D or calcium supplements, which raises the risk of excess calcium.
• Do not apply it to the face, groin, or broken or infected skin, since these areas absorb more and irritate more easily.
• If you use phototherapy for psoriasis, apply calcipotriol after your light session, not before, since UV light breaks it down.

Side effects

Common effects are local: burning, stinging, redness, or itching where you apply it, usually improving as skin adjusts.

Stop and seek urgent medical care for any of these:

• Nausea, vomiting, or loss of appetite together with excessive thirst or muscle cramps.
• Severe skin irritation, blistering, or worsening of the psoriasis itself.
• Signs of an allergic reaction, such as facial swelling or difficulty breathing.

Safety essentials

• Do not exceed your prescribed weekly amount or treated body area. Overuse is the main route to hypercalcemia with this medicine.
• Wash your hands after applying it, unless your hands are the treated area, to avoid accidentally transferring it to your face or eyes.
• Have your blood calcium checked if you're using it long-term over large areas, or alongside other vitamin D or calcium products.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.