What is the mechanism of action of ibuprofen for pain relief?

　　Ibuprofen is a non-steroidal anti-inflammatory drug (NSAID), commonly available in dosage forms such as capsules and tablets. The primary mechanism of ibuprofen's pain-relieving effect involves inhibiting the activity of cyclooxygenase (COX), thereby reducing the synthesis of prostaglandins, achieving analgesic and anti-inflammatory effects.

　　Prostaglandins are chemical substances involved in the processes of inflammation and pain, acting within the body to transmit pain signals and trigger inflammatory responses. The active ingredient in ibuprofen can enter human cells and directly inhibit the synthesis and release of pain-inducing substances by suppressing cyclooxygenase activity, thereby blocking the production of prostaglandins. This action reduces the sensitivity of pain receptors to pain-inducing substances, thus achieving analgesia.

　　Additionally, ibuprofen can reduce inflammatory responses by decreasing prostaglandin production, thereby effectively relieving pain. This mechanism of action makes ibuprofen widely used in the relief of various mild to moderate pains, such as headache, toothache, joint pain, and muscle pain. It is also indicated for the treatment of acute episodes of chronic arthritis, such as rheumatoid arthritis and osteoarthritis, as well as pain caused by soft tissue disorders such as synovitis, tenosynovitis, and periarthritis of the shoulder.

　　When using ibuprofen, it is essential to strictly follow medical instructions. Prolonged or frequent use of ibuprofen is generally not recommended, as the body's responsiveness to the drug may decrease, potentially leading to reduced efficacy or adverse reactions.