Rubefacient

A Rubefacient is a substance that is applied to the skin and causes redness due to the dilation of capillaries and an increase in blood circulation. The term is derived from the Latin word rubeo, which means "I become red". Rubefacients are often used in topical medications and are believed to relieve pain.

Mechanism of Action

Rubefacients work by causing irritation and redness on the skin surface, which distracts the patient from the pain deeper in the tissues. This is known as the counterirritant effect. Some rubefacients also have analgesic properties, which can help to reduce pain.

Uses

Rubefacients are commonly used in over-the-counter creams and lotions to relieve muscle and joint pain. They are also used in sports medicine to warm up muscles before exercise and to treat injuries such as sprains and strains.

Examples

Examples of rubefacients include capsaicin, the active component of chili peppers, and methyl salicylate, which is found in wintergreen oil. Other examples include turpentine, mustard, and ricinoleic acid, which is derived from castor oil.

Safety and Side Effects

While rubefacients are generally safe for topical use, they can cause skin irritation, especially in people with sensitive skin. In rare cases, they can cause severe allergic reactions. It is important to follow the instructions on the product label and to avoid applying rubefacients to broken or irritated skin.

See Also

• Topical medication
• Analgesic
• Counterirritant