Standardized Mite D Farinae Recall
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Standardized mite extract is used for the diagnosis and treatment of allergic disease to mite. Diagnosis of allergic disease to mite is made through a combined medical history sufficiently complete to identity allergic symptoms to mite and identification of mite allergy by diagnostic skin testing.
Hyposensitization therapy to mite is treatment for patients exhibiting allergic reactions to mite. Immunotherapy is intended for patients whose symptoms cannot be satisfactorily controlled by avoidance of the offending allergen or by the use of symptomatic medications. (5)
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The standardized mite extract contains the extractables of Dermatophagoides farinae or Dermatophagoides pteronyssinus. The standardized (Allergy Unit) extract in these vials is designed primarily for the physician equipped to prepare dilutions and mixtures as required. The extract is sterile and contains 50% (v/v) glycerin as a preservative. It is intended for subcutaneous injection. Source material for the mite extract is the whole bodies of the mite. The mites are grown on a medium containing yeast and pork and are processed in a manner to remove at least 99% of the growth medium. The medium contains no material of human origin. Several manufacturers submitted intradermal skin test data on an extract of mite medium from one supplier using patients who were puncture test reactive (∑ E ≥40mm) to mite extracts. By intradermal testing there was one reaction (∑ E ≥20mm) in 44 individuals at an estimated 1% level of medium content of mites, and 4 reactions in 40 individuals at an estimated 10% content. Two of the individuals who were skin test reactive to the mite extract and who were also skin test reactive to the mite medium extract were also skin tested by puncture method with an extract of yeast (Saccharomyces sp.) and were reactive.
The mite extract is standardized by assay using ELISA Competition (1) against a reference extract distributed by the Center for Biologics Evaluation and Research, U.S. Food and Drug Administration. Potency based on Allergy Units (AU/ml) is printed on the label. The F.D.A. reference extract has been assigned 10,000 AU/ml based on quantitative skin testing (2). The mite extract is labeled 10,000 AU/ml because it is statistically equivalent in potency to the reference extract.