Are pain medications causing stomach upset? Then let's learn about these COX-2 Inhibitors!

Do you also experience stomach pain, a burning sensation in the stomach, or gastritis when you take painkillers prescribed by your doctor for joint pain, back pain, or other pain? This is actually a common problem for many people. It is very annoying to have another problem after taking medicine to reduce pain. But did you know that there is a special class of drugs that can reduce this stomach pain and control pain? That class of drugs is called COX-2 inhibitors . Today we are talking about that.

What are COX-2 Inhibitors? Let's understand it simply.

COX-2 inhibitors are actually a member of the same family of painkillers known as NSAIDs (Nonsteroidal Anti-inflammatory Drugs) . The drugs you often use, such as Ibuprofen , Diclofenac, and Naproxen , belong to this group of NSAIDs. The main function of these drugs is to reduce pain, reduce swelling, and reduce fever.

So what's so special about these COX-2 inhibitors? To understand that, we first need to look at how a typical NSAID works inside our bodies.

The two "workers" in our body: COX-1 and COX-2

Imagine that inside our bodies there is a type of enzyme called Cyclooxygenase ( COX ). These are like little workers that do various jobs in our bodies. There are mainly two types of these COX workers.

1. COX-1: This is a "good" worker. Its main job is to protect the lining of our stomach and intestines. It helps create a protective layer to protect the stomach from the digestive acids in the food we eat and drink. It is also involved in the blood clotting process.

2. COX-2: This is often the "troublemaker." When there is an injury, infection, or damage to our body, it goes there and produces chemicals called prostaglandins . These prostaglandins are what cause pain, swelling, and fever. Although this is actually a protective process in the body, in chronic diseases like arthritis, this process continues to cause pain.

Now look, when we take a common NSAID like Ibuprofen, that drug goes into the body and blocks both the good guy (COX-1) and the bad guy (COX-2), meaning they both stop working. Because COX-2 is blocked, the pain and swelling are reduced. That's good. But because COX-1 is blocked, the stomach's protection is also stopped, and the chances of stomach inflammation, gastritis, and even stomach ulcers increase.

Therefore, while the stomach continues to be protected, only the COX-2 enzyme, which causes pain and inflammation, is inhibited. Simply put, the biggest advantage of COX-2 inhibitors is that they control pain while minimizing stomach side effects.

What conditions are COX-2 inhibitors mainly used for?

This type of medication is recommended by doctors for a variety of painful and inflammatory conditions. Below are some of the main ones.

In addition, these medications can also be used for other conditions such as gout and migraine, at the doctor's discretion.

What are the COX-2 Inhibitors used in Sri Lanka and the world?

The most commonly used COX-2 inhibitor in the world and in Sri Lanka is Celecoxib . You may have heard of it under the brand name Celebrex® .

In addition, other COX-2 inhibitors such as Etoricoxib (Arcoxia®) and Parecoxib (Dynastat®) are also used in various countries around the world.

But you should also know this. Several years ago, other COX-2 inhibitors, such as Rofecoxib (Vioxx®) and Valdecoxib (Bextra®) , were on the market. However, later studies found that these drugs significantly increased the risk of heart attack and stroke when used long-term. They also caused some people to develop serious skin diseases. For these reasons, these drugs were taken off the market.

How do I take this medicine? How long should I take it?

COX-2 inhibitors usually come in the form of pills, but they may also be available as an oral solution.

Pain relief begins within an hour of taking this medicine, but it may take a few days for the full anti-inflammatory benefits, such as reducing swelling, to be achieved.

How long you need to take this medicine depends on your medical condition.

• For short-term pain (such as a few days or two weeks): It is always recommended to take the lowest effective dose for the shortest possible time .
• For a long-term condition like arthritis: Your doctor will review your complete health history, other medications you take, and even blood test results if necessary, to determine if it is safe for you to continue taking this medication.

The most important thing is to always take the dose your doctor prescribes, exactly as prescribed, and for the duration prescribed. If you have any concerns, be sure to talk to your doctor before stopping the medication or changing the dosage.

What are the risks and side effects of COX-2 inhibitors?

As we discussed earlier, the main advantage of these drugs is that they have less impact on the stomach and intestines. But that doesn't mean they are risk-free. Some side effects can occur, especially when taken in high doses and for long periods of time.

The two main risks:

1. Risk of heart attacks and strokes: All NSAIDs, including COX-2 inhibitors, may increase the risk of heart attacks and strokes to some extent. This risk is even greater in people who already have risk factors for heart disease, such as high blood pressure and high cholesterol.

2. Stomach and intestinal problems: Although less common than regular NSAIDs, COX-2 inhibitors can cause stomach bleeding and ulcers in some people. This risk is especially high in the elderly and those taking other medications that cause stomach inflammation.

Other possible side effects:

Not everyone gets all of the side effects listed on this list. If you experience any of these symptoms or notice anything unusual, tell your doctor right away.

Who should not take this medicine?

Some people with certain medical conditions are not suitable for COX-2 inhibitors. Your doctor will consider all of these before prescribing the medication for you.

People who should not take COX-2 inhibitors:

• If you have had a previous stroke.
• If you are preparing for or have recently had coronary artery bypass surgery.
• If you have severe kidney disease or liver failure.
• If you have had an asthma attack or severe allergic reaction after taking aspirin or another NSAID.
• If you are allergic to sulfonamide antibiotics.

Those who should be especially careful:

• If you already have stomach ulcers or bleeding.
• If you are in the last 3 months of pregnancy.
• If you are a breastfeeding mother.

If you have any of these conditions, you should definitely tell your doctor.

Warning signs that require immediate medical attention!

If you develop any of the following symptoms while taking COX-2 inhibitors, stop taking the medication and see your doctor immediately or go to the nearest hospital emergency department (ETU).

• Symptoms of liver problems: dark urine, extreme tiredness, yellowing of the skin or eyes, light-colored stools, stomach pain.
• Signs of bleeding: vomiting blood, vomit that looks like coffee grounds, blood in the stool or black tarry stools, blood in the urine, bleeding gums, and easy bruising.
• Symptoms of kidney problems: inability to urinate, decreased urine output, blood in the urine, sudden weight gain.
• Signs of a severe allergic reaction: skin rash, itching, difficulty breathing, wheezing, swelling of the face, lips, or tongue.
• Symptoms of a heart attack: squeezing pain in the chest, pain spreading to the left arm, jaw, or back, difficulty breathing, sweating.
• Symptoms of a stroke: numbness on one side of the face, arm, or leg, difficulty speaking, and sudden, severe headache.