Can Claritin (loratadine) d or Flonase cause false positive in drug test?

Yes for Claritin (loratadine) D. Flonase contains a corticosteroid and should not interfere with usual blood tests. Claritin (loratadine) D contains pseudoephedrine which can cause some drug tests to be positive,
Maybe; no. False positive for which drug? Check out Claritin (loratadine) may give false positive for amphetabmines. Depending upon decongestant (pseudoephedrine), you might also test positive for amphetamines or meth. Flonase (fluticasone) wasn't on list.
Claritin (loratadine) & UDS. Possible false positive for Amphetamines, Opiates & MDMA.

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