Friend tested positive on a drug test today, but has not my used illegal drugs in over a year. If?

he takes Metoprolol, Actos, Lisinopril/hctz, Metformin, & Lantus

I checked and none of the medications you listed can cause a false positive result, now he could have taken an anti biotic which can cause a false positive for heroin and cocaine.

Here is a list of medications which can cause false positive results:
https://alwaystestclean.com/false-positive-drug-test-facts/

Have them test him again with a more advanced test or simply a hair follicle test.

All the best.

Lisinopril

Metformin 500 mg

Metformin 1000 mg twice daily

Metformin Hcl 500 milligram tablets

I take medication for blood clots..and high blood pressure... Eliquis (apixaban) and also Entresto. Would this cause a false postive on drug test?

Will novolog insulin show up in a drug screening