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The reported incidence of allergic reactions to penicillin ranges from 0.7% to 10% (see WARNINGS). Sensitization is usually the result of treatment, but some individuals have had immediate reactions to penicillin when first treated in such cases it is thought that the patients may have had prior exposure to the drug via trace amounts present in milk and vaccines.
Two types of allergic reactions to penicillin are noted clinically immediate and delayed.
Immediate reactions usually occur within 20 minutes of administration and range in severity from urticaria and pruritus to angioneurotic edema, iaryngospasm, bronchospasm, hypotension, vascular collapse and death. Such immediate anaphylatic reactions are very rare (see WARNINGS) and usually occur after parenteral therapy, but have occurred in patients receiving oral therapy. Another type of immediate reaction, an accelerated reaction, may occur between 20 minutes and 48 hours after administration and may include urticaria, pruritus and fever. Although Iaryngeal edema, laryngospasm and hypotension occasionally occur, fatality is uncommon.
Delayed allergic reactions to penicillin therapy usually occur after 48 hours and sometimes as late as two to four weeks after initiation of therapy. Manifestations of this type of reaction include serum sickness-like symptoms (ie, fever, malaise, urticarii, myalgia, arthralgia, abdominal pain) and various skin rashes. Nausea. vomiting, diarrhea, stomatitis, black or harry tongue and other symptoms of gastrointestinal irritation may occur, especially during oral penicillin therapy .
Nervous System REACTIONS
Neurotoxic reactions similar to those observed with penicillin G may occur with large intravenous doses of the peniciilinase-resistant penicillins, especially with patients with renal insufficiency.
Renal tubular damage and interstitial nephritis have been associated with the administration of methicin sodium and infrequently, with the administration of nafcillin and oxacillin. Manifestations of this reacti on may include rash, fever, eosinophilia, hematuria, proteinuria and renal insufficiency. Methicillin-induced nephropathy does not appear to be dose-related and is generally reversible upon prompt discontinuation of therapy.
Hepatotoxicity, characterized by fever, nausea and vomiting associated with abnormal liver function tests, mainly elevated SGOT levels, has been associated with the use of oxacillin.
|RECOMENDED DOSAGES FOR DICLOXACILLIN IN MILD TO MODERATE AND SEVERE INFECTIONS|
|Mild to Moderate||Severe||Mild to Moderate||Severe|
|Dicloxacillin||125 mg every 6 hours||250 mg every 6 hours||12.5 mg/kg/dayb in equally divided doses every 6 hours||25 mg/kg/dayb in equally divided doses every 6 hours|
|b Patients weighing less than 40 kg (88 Ibs.)|
Read the Dynapen (dicloxacillin) Side Effects Center for a complete guide to possible side effects
Read the Dynapen Drug Interactions Center for a complete guide to possible interactions
Last reviewed on RxList: 12/8/2004
This monograph has been modified to include the generic and brand name in many instances.
Additional Dynapen Information
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.
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