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 http://www.askdocweb.com/falsepositives.html. 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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