DR P. MARAZZI / SCIENCE PHOTO LIBRARY DR P. MARAZZI / SCIENCE PHOTO LIBRARY
Dense red rash due to an allergy to penicillin. This is a mild example of hypersensitivity, the most important side effect of penicillin. A more extreme form is that of anaphylactic shock, which can be fatal. Persons allergic to one penicillin will be allergic to all types as the basic structure is the same. A rare, serious toxic effect is encephalopathy due to cerebral irritation. This may result from very high doses, & also at normal doses in patients with kidney failure.
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