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Had a hair drug test and my prescribed drug (methylphenidate) was not found. Any reason why?

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Answers (4)

29 May 2012

Tests vary in accuracy, the less costly are less accurate, the high end are very accurate. It could be the test used was a lower end version. Hope this helps.

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29 May 2012

Another reason can be that the amount found in your hair is below the cutoff limit for the test. anything below the cutoff is listed as a negative result even though some medication is found.

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30 May 2012

One, well... me, would imagine with a hair sample being tested, that the tester was serious about what drug was there, what wasn't ... gc/ms serious. Those things can test for one soma, found metabolites, that I had taken 3 weeks earlier. Not kidding. Of course I had a script, just didn't like them, like Robaxin 750, works better on me.
Just wonderin',

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DzooBaby 30 May 2012

I'm not saying he wasnt serious. He asked for a reason WHY something might not be there and that is a reason. This is true for a hair or a urine test. They have certain cutoff limits and if the amount of drug falls below this cutoff limit, it will come up as a negative. Whether this is truly what happened? I dont know but it is a possibility why something might show negative when a person knows they are taking a drug. It doesnt mean drug wasnt found, it is just below the cutoff limit.

Anonymous 30 May 2012

Thanks my bud. I know bout sensitivities... just pondering.

30 Sep 2013

Ritalin is not tested for in 5 panel or 10 panel tests. Ritalin is a methylphenidate not an amphetamine. It will not cause a positive or a false positive in a hair follicle tests. Too many people post mis conceptions and cannot back up their statements. Ritalin can be tested for however its very expensive and rarely ever does a company test for it.

Ritalin can cause a false positive in a urine test however its not common.

Anti depressants will never show up in a hair test.

Most people don't even know what ritalin is made of. It's formulation comes from the piperdine class not amphetamine class.

I have spoken to several reputable drug testing companies almost all universally told me it will not show up on a hair follicle test.

Don't listen to the people who post just to post. They usually piggy back from another person who has no clue about ritalin etc.

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