False positive taking Lamictal

[jkf1956]

My daughter gets a positive drug test for PCP and she is taking Lamictol.
does any one know about this ?

 

[N Sperlo]

After a quick google search, it appears Lamictal can cause a false positive for PCP. Shes not the first case. I always keep my meds with me when I go to places where it would matter to prove I'm on something that will cause it.

 

[Bernard]

Looks like it's a real thing:

...
Conclusion

Lamotrigine has the potential to cause false-positive results for PCP on the Bio-Rad TOX/See urine toxicology screen.
...

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3047872/