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Non-steroidal anti-inflammatory drugs (NSAIDs) work by interfering with particular enzymes in your body.
Enzymes are a special type of protein which help to bring about, or speed up, a chemical reaction within your body. For example, digestive enzymes help your digestive systemÂ break up large food particles into smaller pieces soÂ your body can absorb them.
There are many enzyme systems in the body. One enzyme system involved in inflammation and pain is called the cyclo-oxygenase system.
NSAIDs interfere with an enzyme called cyclo-oxygenase (COX). Different parts of your body have different types of COX enzymes, which control the production of chemicals called prostaglandins. Different prostaglandins have different functions.
For example, the stomach contains a sub-type of COC called COX. This enzyme controls the production of substances called prostaglandins that help protect the stomach from acid (which is normally present in the stomach). Another sub-type called COX-2 enzymes are mainly activated during infection, injury or inflammation, and produce the prostaglandins involved in pain and inflammation.
NSAIDs can reduce pain and inflammation by preventing COX enzymesÂ releasing the prostaglandin chemicals that cause pain and inflammation. However, prostaglandins carry out many different functions within your body. Interfering with them can cause a number of side effects, such asÂ indigestion, inflammation of the stomach liningÂ and stomach ulcers.
To prevent side effects, researchers developed a new 'family' of NSAIDs known asÂ COX-2 inhibitors.
These are designed to block the enzymes that cause pain and inflammation but avoid blocking the enzymes that protect the stomach lining. This helps reduce the risk of indigestion and stomach ulcers.
Although COX-2 inhibitors have less effect on the stomach, they might be more likely than traditional NSAIDsÂ to cause side effects to the heart. Further research into this issue is ongoing. This means they may be more suitable for someoneÂ at risk of developing stomach or intestinal problems, but less suitable for those with a heart or circulation problem.
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