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It is very unlikely for one drug to cause a false positive on a drug screen for any other substance. Drug screens test for metabolites of specific drugs. All drug tests have a rating based on specificity and sensitivity. The higher the sensitivity, the lower the specificity. Basically it is only possible to have a false positive by using another drug that is very chemically similar to the positive test.

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14y ago
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10y ago

I came up positive for benzoate I'm only on prazosin can this be a false positive

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13y ago

No, because it isn't one.

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Q: Will prazosin test positive for phenabarbitol?
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