DRUG INTERACTIONS
In patients who are receiving corticosteroids or immunosuppressive agents, reactivity to the test may be depressed or suppressed. This reduced reactivity may be present for as long as 5-6 weeks after discontinuation of therapy (see PRECAUTIONS -- General). 9
The reactivity to PPD may be temporarily depressed by certain live virus vaccines. Therefore, if a tuberculin test is to be performed, it should be administered either before or simultaneously with the use of oral polio and/or injection of measles, mumps and rubella vaccines in combined form or as separate antigens, or testing should be postponed for 4-6 weeks. 10
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