Medications and substances

Cross-reactions

Certain medications can cause positive results on drug tests, even though the person is not abusing drugs. This is called a cross-reaction and is important to know about to avoid misunderstandings. Below you will find an overview of common medications and which substances they can cross-react with in rapid tests.

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Medications and medicines

What are cross-reactions?

Cross-reactions mean that certain medications can give false positive results on drug tests, even though the person has not used narcotics. This is because the medication contains substances that are chemically similar to drugs.

  • For positive drug tests in the workplace, an MRO physician always conducts a medical review and may contact the employee to determine if the result can be explained by, for example, prescribed medications before it is confirmed as positive.
  • For positive drug test results, it is always recommended to verify the sample through laboratory analysis. Rapid tests work well as initial screening, but results can be affected by cross-reactions from prescribed medications. Laboratory verification ensures a reliable, accurate, and legally sound result, which is crucial in both the workplace and healthcare settings.

Search the medication list

Use the search field to find specific medications, substances, or which tests they give positive results on

Showing 205 of 205 substances

  • (1R,2S)-(-)-Efedrin (Efedrinhydroklorid)

    Shows positive on
    KETAMIN (KET 1000)

  • 11-nor-Δ8-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 50)

  • 11-nor-Δ8-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 20)

  • 11-nor-Δ8-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 200)

  • 11-nor-Δ9-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 50)

  • 11-nor-Δ9-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 200)

  • 11-nor-Δ9-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 20)

  • 11-nor-Δ9-THC-9-COOH

    Shows positive on
    MARIJUANA (THC 200)

  • 2-Etylidin-1,5-dimetyl-3,3-difenylpyrrolidin (EDDP)

    Shows positive on
    EDDP 100

  • 3-CMC

    Shows positive on
    3-CMC/3-MMC

  • 3-MMC

    Shows positive on
    3-CMC/3-MMC

  • 3,4-Metylendioxy Amfetamin HCl

    Shows positive on
    MDMA 500 (Ecstasy)

  • 3,4-Metylendioxy Metamfetamin HCl

    Shows positive on
    MDMA 500 (Ecstasy)

  • 3,4-Metylendioxy-Metamfetamin

    Shows positive on
    METAMFETAMIN (MET 300)

  • 3,4-Metylendioxyamfetamin

    Shows positive on
    AMFETAMIN (AMP 300)

  • 3,4-Metylendioxyetyl-Amfetamin

    Shows positive on
    MDMA 500 (Ecstasy)

  • 3,4-Metylendioxyetyl-Amfetamin

    Shows positive on
    KETAMIN (KET 1000)

  • 3,4-Metylendioxymetamfetamin

    Shows positive on
    METAMFETAMIN (MET 300)

  • 3,4-Metylendioxymetamfetamin (MDMA)

    Shows positive on
    KETAMIN (KET 1000)

  • 3,4-Metylendioxypyrovalerone HCl (MDPV)

    Shows positive on
    3-CMC/3-MMC

  • 3,4-Metylendixoyamfetamin (MDA)

    Shows positive on
    CAT (KAT) 150 ng/mL

  • 4-Hydroxyfencyklidin

    Shows positive on
    PCP

  • 4-Hydroxyfencyklidin

    Shows positive on
    KETAMIN (KET 1000)

  • 4-MEC

    Shows positive on
    3-CMC/3-MMC

  • 5-MeO-DIPT

    Shows positive on
    PSILOCYBIN (PY 500)

  • 6-MAM

    Shows positive on
    OPIATER (OPI 200)

  • Alfentanil

    Shows positive on
    FENTANYL (FYL 10)

  • Alprazolam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Alprazolam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Amoxicillin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Bensfetamin

    Shows positive on
    KETAMIN (KET 1000)

  • Bensoylekgonin

    Shows positive on
    KOKAIN (COC 100)

  • Bromazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Bromazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Bromhexin

    Shows positive on
    FENTANYL (FYL 10)

  • Buprenorfin

    Shows positive on
    BUPRENORFIN (BUP 10)

  • Buprenorfin 3-D-Glukuronid

    Shows positive on
    BUPRENORFIN (BUP 10)

  • Buspiron

    Shows positive on
    FENTANYL (FYL 10)

  • Buspiron

    Shows positive on
    LSD (10)

  • Cannabidiol (CBD-olja)

    Shows positive on
    MARIJUANA (THC 50)

  • Cannabidiol (CBD-olja)

    Shows positive on
    MARIJUANA (THC 25)

  • Cannabidiol (CBD-olja)

    Shows positive on
    MARIJUANA (THC 200)

  • Cannabinol

    Shows positive on
    MARIJUANA (THC 200)

  • Cannabinol

    Shows positive on
    MARIJUANA (THC 25)

  • Cannabinol

    Shows positive on
    MARIJUANA (THC 50)

  • Ciprofloxacin

    Shows positive on
    FENTANYL (FYL 10)

  • Ciprofloxacin Hydrochloride

    Shows positive on
    LSD (10)

  • Cis-tramadol

    Shows positive on
    TRAMADOL (TML 100)

  • d l-O-Desmetyl venlafaxin

    Shows positive on
    TRAMADOL (TML 100)

  • D-Metamfetamin

    Shows positive on
    METAMFETAMIN (MET 300)

  • D-Metamfetamin

    Shows positive on
    KETAMIN (KET 1000)

  • D,L-Amfetamin

    Shows positive on
    CAT (KAT) 150 ng/mL

  • Delorazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Delorazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Desalkylflurazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Desalkylflurazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Dexamfetamin

    Shows positive on
    CAT (KAT) 150 ng/mL

  • Dexamfetamin

    Shows positive on
    AMFETAMIN (AMP 300)

  • Dexamfetamin (Lisdexamfetamin)

    Shows positive on
    MEFEDRON

  • Dexamfetamin (Lisdexamfetamin)

    Shows positive on
    CAT (KAT) 150 ng/mL

  • Dexamfetamin (Lisdexamfetamin)

    Shows positive on
    AMFETAMIN (AMP 300)

  • Dexamfetamin (Lisdexamfetamin)

    Shows positive on
    METAMFETAMIN (MET 300)

  • Dextrometorfan

    Shows positive on
    KETAMIN (KET 1000)

  • Diazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Dimethyltryptamine (DMT)

    Shows positive on
    PSILOCYBIN (PY 500)

  • Disopyramid

    Shows positive on
    KETAMIN (KET 1000)

  • Efavirenz

    Shows positive on
    MARIJUANA (THC 25)

  • Efavirenz

    Shows positive on
    MARIJUANA (THC 50)

  • Efavirenz

    Shows positive on
    MARIJUANA (THC 200)

  • Ekgonin

    Shows positive on
    KOKAIN (COC 100)

  • Estazolam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Etanol

    Shows positive on
    Etylglukuronid (ETG 500)

  • Etylglukuronid

    Shows positive on
    Etylglukuronid (ETG 500)

  • EtylMorfin

    Shows positive on
    OPIATER (OPI 200)

  • Fencyklidin

    Shows positive on
    PCP

  • Fencyklidin

    Shows positive on
    KETAMIN (KET 1000)

  • Fencyklidin (PCP)

    Shows positive on
    TRAMADOL (TML 100)

  • Fenetylamin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Fenfluramin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Fenfluramin

    Shows positive on
    FENTANYL (FYL 10)

  • Fentanyl

    Shows positive on
    FENTANYL (FYL 10)

  • Fentanyl

    Shows positive on
    LSD (10)

  • Fentermin

    Shows positive on
    AMFETAMIN (AMP 300)

  • Fexofenadin

    Shows positive on
    FENTANYL (FYL 10)

  • Fexofenadin

    Shows positive on
    TRAMADOL (TML 100)

  • Flukloxacillin

    Shows positive on
    ZOPIKLON

  • Flunitrazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Flunitrazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Flunitrazepam (f.d. Rohypnol)

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Fluoxetin

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Gabapentin

    Shows positive on
    PREGABALIN (PGB 500ng/mL)

  • Gabapentin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Gabapentin

    Shows positive on
    ZOLPIDEM (ZOL 50)

  • Glucuronic Acid

    Shows positive on
    Etylglukuronid (ETG 500)

  • Hexahydrocannabinol (HHC), Hexahydrocannabinol acetat (HHC-O)

    Shows positive on
    MARIJUANA (THC)

  • Hydrokodon

    Shows positive on
    OPIATER (OPI 200)

  • Hydrokodon

    Shows positive on
    OXIKODON (OXY 100)

  • Hydromorfon

    Shows positive on
    OXIKODON (OXY 100)

  • Hydromorfon

    Shows positive on
    OPIATER (OPI 200)

  • Hydroxizin

    Shows positive on
    FENTANYL (FYL 10)

  • Isoxsuprin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Katinon

    Shows positive on
    3-CMC/3-MMC

  • Ketamin

    Shows positive on
    KETAMIN (KET 1000)

  • Klobazam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Klobazam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Klonazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Klonazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Klonidin

    Shows positive on
    KETAMIN (KET 1000)

  • Klorazepat-dipotassium

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Klordiazepoxid

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Klordiazepoxid

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Klorfeniramin

    Shows positive on
    KETAMIN (KET 1000)

  • Klozapin

    Shows positive on
    FENTANYL (FYL 10)

  • Kodein

    Shows positive on
    OPIATER (OPI 200)

  • Kodein

    Shows positive on
    KETAMIN (KET 1000)

  • Kokain HCl

    Shows positive on
    KOKAIN (COC 100)

  • Komaetylen

    Shows positive on
    KOKAIN (COC 100)

  • Kvetiapin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Kvetiapin

    Shows positive on
    KETAMIN (KET 1000)

  • L-Metamfetamin

    Shows positive on
    KETAMIN (KET 1000)

  • L-Metamfetamin

    Shows positive on
    METAMFETAMIN (MET 300)

  • Lamotrigin

    Shows positive on
    SPICE/K2

  • Lamotrigin

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Levoamfetamin

    Shows positive on
    AMFETAMIN (AMP 300)

  • Levorfanol

    Shows positive on
    OXIKODON (OXY 100)

  • Levorfanol

    Shows positive on
    KETAMIN (KET 1000)

  • Levorfanol

    Shows positive on
    OPIATER (OPI 200)

  • Lorazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • LYSERGSYRADIETYLAMID

    Shows positive on
    LSD (10)

  • Maprotilin

    Shows positive on
    AMFETAMIN (AMP 300)

  • Mefedron

    Shows positive on
    3-CMC/3-MMC

  • Mefentermin

    Shows positive on
    KETAMIN (KET 1000)

  • Mefentermin

    Shows positive on
    METAMFETAMIN (MET 300)

  • Meperidin

    Shows positive on
    KETAMIN (KET 1000)

  • Metadon

    Shows positive on
    EDDP 100

  • Metadon

    Shows positive on
    KETAMIN (KET 1000)

  • Metanol

    Shows positive on
    Etylglukuronid (ETG 500)

  • Metkatinon

    Shows positive on
    3-CMC/3-MMC

  • Metoklopramid

    Shows positive on
    LSD (10)

  • Metoxyfenamin

    Shows positive on
    KETAMIN (KET 1000)

  • Metoxyfenamin

    Shows positive on
    CAT (KAT) 150 ng/mL

  • Metylfenidat

    Shows positive on
    LSD (10)

  • Metylfenidat

    Shows positive on
    FENTANYL (FYL 10)

  • Metylfenidat

    Shows positive on
    METYLFENIDAT (MPD 150)

  • Midazolam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Mitragynin, 7-hydroxymitragynin

    Shows positive on
    KRATOM (KRA 300)

  • Morfin

    Shows positive on
    OPIATER (OPI 200)

  • Morfin 3β-glukuronid

    Shows positive on
    Etylglukuronid (ETG 500)

  • Morfin 6β-glukuronid

    Shows positive on
    Etylglukuronid (ETG 500)

  • Morfin-3-β-D-Glukuronid

    Shows positive on
    OPIATER (OPI 200)

  • Naloxon

    Shows positive on
    OXIKODON (OXY 100)

  • Naltrexon

    Shows positive on
    OXIKODON (OXY 100)

  • Naproxen

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Nitrazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • NorBuprenorfin

    Shows positive on
    BUPRENORFIN (BUP 10)

  • NorBuprenorfin 3-D-Glukuronid

    Shows positive on
    BUPRENORFIN (BUP 10)

  • Nordiazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Nordiazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Norfentanyl

    Shows positive on
    FENTANYL (FYL 10)

  • Norfentanyl

    Shows positive on
    LSD (10)

  • Norklordiazepoxid

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Norklordiazepoxid

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Norkodein

    Shows positive on
    OPIATER (OPI 200)

  • Normorfon

    Shows positive on
    OPIATER (OPI 200)

  • Norpseudoefedrin Hcl

    Shows positive on
    CAT (KAT) 150 ng/mL

  • Oxazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Oxazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Oxikodon

    Shows positive on
    OPIATER (OPI 200)

  • Oxikodon

    Shows positive on
    OXIKODON (OXY 100)

  • Oxikodon/Naloxon

    Shows positive on
    OXIKODON (OXY 100)

  • Oximorfon

    Shows positive on
    OXIKODON (OXY 100)

  • Oxykodon/Naloxon

    Shows positive on
    OPIATER (OPI 200)

  • Oxymorfon

    Shows positive on
    OPIATER (OPI 200)

  • Paliperidon

    Shows positive on
    FENTANYL (FYL 10)

  • Pentazocin

    Shows positive on
    KETAMIN (KET 1000)

  • Petidin

    Shows positive on
    KETAMIN (KET 1000)

  • Pregabalin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Pregabalin

    Shows positive on
    PREGABALIN (PGB 500ng/mL)

  • Prokain

    Shows positive on
    OPIATER (OPI 200)

  • Promazin

    Shows positive on
    KETAMIN (KET 1000)

  • Prometazin

    Shows positive on
    FENTANYL (FYL 10)

  • Prometazin

    Shows positive on
    EDDP 100

  • Prometazin

    Shows positive on
    KETAMIN (KET 1000)

  • Prometazin

    Shows positive on
    FENTANYL (FYL 10)

  • Propyl β-D-glukuronid

    Shows positive on
    Etylglukuronid (ETG 500)

  • Risperidon

    Shows positive on
    FENTANYL (FYL 10)

  • Risperidon

    Shows positive on
    LSD (10)

  • Ritalinsyra

    Shows positive on
    METYLFENIDAT (MPD 150)

  • RS-Lorazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • RS-Lorazepamglukuronid

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Sertralin

    Shows positive on
    LSD (10)

  • Sufentanil

    Shows positive on
    FENTANYL (FYL 10)

  • Tebain

    Shows positive on
    OPIATER (OPI 200)

  • Temazepam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Temazepam

    Shows positive on
    7-AMINOKLONAZEPAM (7-ACL 100)

  • Tetrahydrosolin

    Shows positive on
    KETAMIN (KET 1000)

  • Tetrakain

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Tioridasin

    Shows positive on
    KETAMIN (KET 1000)

  • Trazodon

    Shows positive on
    FYL (10), FYL (2)

  • Trazodon

    Shows positive on
    LSD (10)

  • Triazolam

    Shows positive on
    BENSODIAZEPINER (BZO 200)

  • Venlafaxin

    Shows positive on
    GABAPENTIN 2000 ng/mL

  • Zolpidem

    Shows positive on
    ZOLPIDEM (ZOL 50)

  • Zopiklon

    Shows positive on
    LSD (10)

  • Zopiklon

    Shows positive on
    ZOPIKLON (ZOP 50)

Important information

It is important to understand how cross-reactions are handled in our tests

  • MRO physicians review all results

    A Medical Review Officer (MRO) reviews all positive results before they are reported. This ensures that prescribed medications are not mistakenly interpreted as abuse.

  • Inform about medications

    Employees should always inform the sample collector about any prescribed medications. This speeds up the process and avoids misunderstandings.

  • The list is not complete

    This is a general list of common medications. For questions about specific medications, contact our medical experts.

Do you have questions about cross-reactions?

Contact our medical experts for advice on specific medications and how they can affect drug tests.

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Cross-reactions in drug tests