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Information about Rilonacept

Rilonacept is a recombinant interleukin-1 (IL-1) antagonist which is used in the therapy of cryopyrin-associated periodic syndromes (CAPS) and other autoinflammatory conditions.

Liver safety of Rilonacept

Rilonacept has had limited clinical use and has yet to be linked to cases of clinically apparent, acute liver injury.

Mechanism of action of Rilonacept

Rilonacept (ril on’ a sept) is a recombinant fusion protein which includes the extracellular portion of the human IL-1 receptor and the IL-1 receptor accessory protein fused with the Fc portion of human IgG1. Rilonacept binds and inactivates IL-1, acting as an “IL-1 trap”. IL-1 is a key proinflammatory cytokine that is a powerful inducer of fever and inflammation. Excessive production of IL-1 or lack of its inactivation is believed to play a major role in many autoinflammatory conditions and particularly in cold induced autoinflammatory conditions such as cryopyrin associated periodic syndromes (CAPS). IL-1 may also play an important role in inflammatory arthritidies and familial Mediterranean fever. In controlled trials and open label studies, rilonacept has been shown to improve symptoms and laboratory abnormalities associated CAPS and, to a lesser extent, in patients with gouty arthritis, juvenile idiopathic arthritis, familial Mediterranean fever and in rare forms of autoinflammatory conditions such as Schnitzler syndrome.

FDA approval information for Rilonacept

Rilonacept was approved for use in the United States in 2010 to treat CAPS. Rilonacept is given by subcutaneous injection in a loading dose of 320 mg and a maintenance dose of 160 mg weekly.

Dosage and administration for Rilonacept

Rilonacept is available in vials of 20 mL containing 222 mg of rilonacept under the brand name Arcalyst.

Side effects of Rilonacept

The most frequent side effects are injection site reactions, upper respiratory symptoms, headache, nausea and hypertension. Potential serious adverse events include life-threatening infections and hypersensitivity reactions.

antirheumatic agents

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