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| Trade names | Pre-Pen |
| Other names | Pre-Pen |
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| Routes of administration | Liquid intradermal |
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Benzylpenicilloyl polylysine (Pre-Pen) is used as a skin test before the administration of penicillin. It is used to detect the immunoglobulin E antibodies. [1] [2] The chemical structure consists of the benzylpenicilloyl group attached to a polymer of L-lysine. [3] [4] [5]