## **Core Concept**
Reiter's disease, also known as reactive arthritis, is a form of seronegative spondyloarthritis that typically occurs in response to a bacterial infection, often after a gastrointestinal or genitourinary infection. It is characterized by a triad of arthritis, conjunctivitis, and urethritis. The management of arthritis in Reiter's disease focuses on controlling inflammation, relieving symptoms, and preventing long-term joint damage.

## **Why the Correct Answer is Right**
The correct answer, **Indomethacin**, is a nonsteroidal anti-inflammatory drug (NSAID) that is particularly effective in managing the symptoms of arthritis in Reiter's disease. NSAIDs like indomethacin work by inhibiting cyclooxygenase (COX) enzymes, which are crucial for the production of prostaglandins. Prostaglandins play a key role in mediating inflammation and pain. Indomethacin is often chosen for its potent anti-inflammatory and analgesic properties, making it effective for treating the acute inflammatory phase of reactive arthritis.

## **Why Each Wrong Option is Incorrect**
- **Option A:** While physical therapy is an important component of managing arthritis in Reiter's disease, it is not a drug and therefore cannot be considered the drug of choice.
- **Option B:** Corticosteroids may be used in severe cases of reactive arthritis for their potent anti-inflammatory effects but are not the first line of treatment due to their side effects and the availability of other effective treatments like NSAIDs.
- **Option C:** Disease-modifying antirheumatic drugs (DMARDs) like methotrexate may be considered in patients with persistent arthritis that does not respond to NSAIDs, but they are not the initial drug of choice for acute management.
- **Option D:** Antibiotics are used to treat the initial bacterial infection that may trigger reactive arthritis but are not used to treat the arthritis itself unless there is evidence of a continuing infection.

## **Clinical Pearl / High-Yield Fact**
A key point to remember is that the mainstay of treatment for reactive arthritis, especially in its acute phase, is NSAIDs. Among NSAIDs, **indomethacin** is often favored for its efficacy in quickly reducing inflammation and alleviating symptoms. However, it's also important to monitor patients for potential side effects and to consider other treatments if NSAIDs are contraindicated or ineffective.

## **Correct Answer:** . Indomethacin