We encountered two patients with severe cow's milk allergy who reacted strongly to an injection of methylprednisolone sodium succinate (Sol-Medrol 40 mg Pfizer, Japan). They came to our hospital because of an asthmatic attack or urticaria and were treated with Sol-Medrol 40 mg. After the injection, the allergic reaction was immediate. Skin prick tests demonstrated that the beta-lactoglobulin contaminating the lactose of the drug preparation caused the immediate allergic reaction.

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