Pain killers: How does body pain go away immediately after taking a painkiller? How does the medicine work?
- bySherya
- 20 Apr, 2026
Pain killers: How pain-relieving medicines work after entering the body, it is a scientific process that shows effect quickly.
How do painkillers work?
Painkillers: When there is any kind of pain in the body, people often turn to painkillers. The remarkable thing is that the pain begins to subside shortly after taking the medicine. How is this possible? Pain in the body is a kind of signal that there is a problem, injury, or inflammation somewhere. Whenever this pain occurs, chemicals called prostaglandins are produced in the body, which signal the brain through nerves where the pain is occurring.
How do painkillers work?
Most painkillers, such as paracetamol and ibuprofen, help reduce the production of these pain-causing chemicals in the body. These medications help block the production of prostaglandins. When these chemicals are produced less, pain signals are less transmitted to the nerves. As a result, we experience pain relief.
Why is the effect visible so quickly?
These medications are rapidly absorbed into the bloodstream upon entering the stomach. They then rapidly circulate throughout the body through the bloodstream, particularly affecting the brain and the area of pain. Typically, most painkillers begin to work within 20 to 30 minutes.
How many types of painkillers are there?
There are different types of painkillers, and their way of working is also different.
- Analgesics – Common painkillers, such as paracetamol, reduce pain and fever, but do not have much effect on inflammation.
- NSAIDs – Medicines like ibuprofen, which work on pain as well as inflammation.
- Opioids – These are given when pain isn't being controlled, as they directly affect the brain. However, taking them without a doctor's advice can be harmful.
Painkillers should be used in the correct dosage and as needed. Excessive or frequent use can cause side effects such as stomach irritation or ulcers, kidney or liver damage, and increased blood pressure.
Precautions are necessary
- Always take the medicine in the prescribed quantity.
- Avoid taking painkillers on an empty stomach.
- If the pain persists for a long time, consult a doctor immediately.
- Take special care while giving medicine to children and elderly people.






