Serum sickness-like reaction

Serum sickness-like reaction (SSLR) is a medical condition that mimics serum sickness, a type of hypersensitivity reaction that occurs in response to certain medications or serum from an animal or another person. Unlike serum sickness, SSLR is not caused by immune complex deposition and does not result in complement activation.

Causes

SSLR is most commonly associated with the use of certain antibiotics, including cephalosporins and penicillins. Other medications, such as nonsteroidal anti-inflammatory drugs (NSAIDs) and anticonvulsants, can also cause SSLR. In rare cases, it can occur in response to certain vaccines.

Symptoms

The symptoms of SSLR typically appear 1-3 weeks after exposure to the causative agent. They can include fever, rash, joint pain, and swelling. In severe cases, patients may also experience nausea, vomiting, and diarrhea. The symptoms usually resolve within a week after discontinuation of the causative agent.

Diagnosis

The diagnosis of SSLR is primarily based on the patient's clinical history and physical examination. Laboratory tests are not typically helpful in confirming the diagnosis, as they can be normal or only mildly abnormal. In some cases, a skin biopsy may be performed to rule out other conditions.

Treatment

The treatment of SSLR involves discontinuation of the causative agent and symptomatic management. Antihistamines and corticosteroids may be used to alleviate symptoms. In severe cases, hospitalization may be required.

See also

• Serum sickness
• Drug hypersensitivity
• Hypersensitivity reaction

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