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What is a false positive for a drug test? A false positive is a drug test that is returned positive because another compound you used set off a false positive.

It is a case of mistaken identity. For example if you eat a couple poppy seed cakes before testing, you can get a positive result for opiates.

The chances of you getting a false positive depends on the quality of the laboratory that does the testing. There seems to be about 1,200 of these labs in the United States currently testing for drugs. Less than a 100 of these meet federal standards and most of the individual states do not regulate drug test labs. The number of false positives returned range from 4% to over 50%, depending on the lab.

A concern here is that, if your company tests for drug usage, they are probably not required to use a certified drug testing lab, which means you have a greater chance of getting a false positive.

Unfortunately false positives are not always caused by other compound, human errors, such as labeling errors, inadequate training of laboratory staff and fatigue or boredom are also possible and capable of producing a false positive result.

The worst case is when a lab tech deliberately makes your clean sample positive for drugs. Which is what happen in Boston Massachusetts, a Boston crime lab chemist admitted that she altered or faked test results of drug cases assigned to her, which resulted in 1,140 possible innocent inmates convicted using tainted evidence case to be re-evaluated.

The list below shows various substances that can causes a false positive drug test result.

A

  • 4-Way Nasal Spray - false positive for Amphetamines, Morphine
  • Accutrim (PHENYLPROPANOLAMINE - Dexatrim) - false positive for Ecstasy (MDMA), Meth
  • Acetaminoph w/codeine - false positive for Morphine
  • Acet-AM (Theophylline Calcium Glycinate) - false positive for Amphetamines, Heroin, Opiates
  • Acro-Lase Plus® contains barbiturates
  • Adam (slang) - may test positive for methamphetamine and ecstasy
  • Afrinol (Pseudoephedrine) - may test positive for amphetamines
  • A.P.C. w/codeine - false positive for Morphine
  • A.R.M. - false positive for Amphetamines
  • Aciphex (rabeprazole sodium) - PPIs may test positive for THC
  • Actifed (pseudoephedrine and triprolidine) - false positive for Amphetamines
  • Adderall - contains amphetamine, positive for Meth
  • Advil (Ibuprofen) - false positive for THC, Marijuana
  • Afrin (Oxymetazoline Nasal Spray) - false positive for Ecstasy (MDMA), Meth
  • Aleve (Naproxen) - false positive for THC, Marijuana
  • Alka-Seltzer Plus - false positive for Amphetamines, Morphine
  • Allerest - false positive for Amphetamines, Ecstasy, Meth and Morphine
  • Allobarbital - may test positive for Barbiturates
  • Alphenol - may test positive for Barbiturates
  • Alprazolam - contains benzodiazepines
  • Amantadine - may test false positive for amphetamines
  • Ambenyl - contains codeine
  • Amesec - false positive for Amphetamines, Heroin, Opiates
  • Amfepramone - false positive for Amphetamines, Ecstasy (MDMA), Meth
  • Amifepramone - false positive for Amphetamines and Ecstasy
  • Amineptine - false positive for Amphetamines and Ecstasy
  • Amitriptyline (including the trade names Elavil, Lentizol, Tryptizol, Triptafen, Triptafen-M) - false positive for LSD
  • Amitriptyline - may test positive for Tricyclic Antidepressants (TCA)
  • Amobarbital - may test positive for barbiturates
  • Amogel PG® - contains opium/morphine
  • Amoxicillin - false positive for cocaine
  • Ampicillin - false positive for cocaine
  • Amisulpride - may show false positive for opioids
  • Amphetaminil - metabolizes to amphetamine
  • Ampicin - may cause false positive for opiates
  • Amytal - Positive for Barbiturates
  • Anaprox - false positive for THC, Marijuana
  • Ansaid - false positive for marijuana
  • Anti Anxiety medication, most - false positive for benzodiazepines
  • Anti Inflammatories - such as Naproxyn
  • Antiasthmatics that contain phenobarbitol - false positive for barbiturates
  • Antihistamines in general - false positives for Methadone
  • Antibiotics - false positives for Heroin, Cocaine
  • Antrocol Elixor® - contains barbiturates
  • Apo-Naproxen - false positive for THC, Marijuana
  • Aprobarbital - may test positive for barbiturates
  • Artane - false positive for LSD
  • Ascriptin w/codeine - false positive for Morphine
  • Asthma medications - false positives for Amphetamines and Ecstasy
  • Astramoprh PF® - contains morphine
  • Ativan® (lorazepam) - contains benzodiazepines
  • Atripla (Efavirenz) - false positive for cannabinoid THC
  • Avelox (Fluoroquinolone) - false positive for opiates

B

  • B-2 vitamin - false positive for THC
  • Bactrim - may test positive for benzodiazepines
  • Barbital - may test positive for barbiturates
  • Bayer Select Maximum Strength Sinus Pain Relief Caplets - false positive for Amphetamines
  • Bayer Select Pain Relief Formula - false positive for THC, Marijuana
  • Benadryl (Diphenhydramine) - false positives for benzodiazepines, PCP, tricyclic antidepressants
  • Benadryl (Diphenhydramine) - false positives for PCP
  • Bentyl® - false positive for LSD, Methadone
  • Benylin - false positive for Opioids
  • Benzedrine® - Amphetamines
  • Benzphetamine - false positives for Amphetamines, Ecstasy, and LSD
  • Biphetamine® - for Amphetamines
  • Black Pearls (Tung Sheuh pills) - contain benzodiazepines
  • Briantum - may test positive for benzodiazepines
  • Bromazepam (including the trade names Lexotan) - may test positive for benzodiazepines 52)
  • Bromocription - false positive for LSD
  • Bromphenlramlne - false-Positive for Amphetamine
  • Broncholate CS - contains codeine
  • Bronkaid - false positive for Amphetamines, Heroin, Opiates, Ecstasy, Meth
  • Bronkotabs - false positive for Amphetamines, Heroin, Opiates
  • Buprenex® - contains synthetic opiates
  • Buprenorphine - contains synthetic opiates
  • bupivacaine - may test false positive for cocaine
  • Bupropion (Wellbutrin) - false positive for Amphetamines
  • Bupropion - may test false positive for MDMA
  • Bupropion - may test false positive for amphetamine and MDMA
  • Buproprion - false positive for LSD
  • Buspirone - false positive for LSD
  • Butabarbital (including the trade names Butisol and Soneryl) - may test positive for Barbiturates
  • Butalbital (including the trade names Fioricet and Fiorinal) - may test positive for Barbiturates
  • Butisol - may test positive for Barbiturates

C

  • Cafergot® - false positive for LSD
  • Caldecon - false positive for Amphetamines, Morphine
  • Capital and Codeine Oral Solution - false positive for Opioids
  • Captagon® - metabolizes to amphetamine
  • Carbamazepine - false positive for Tricyclic Antidepressants (TCA) Other brand names of Carbamazepine include Biston, Calepsin, Carbatrol, Equetro, Finlepsin, Sirtal, Stazepine, Telesmin, Tegretol, EPITAB XR(Pakistan) Teril, Timonil, Trimonil, Epimaz, Carbama/Carbamaze (New Zealand), Amizepin (Poland), Carzine (Kolkata), Mazetol, Tegrital, Tegrita (India), Karbapin (Serbia), Hermolepsin (Sweden), Degranol (South Africa), and Tegretal (Chile, Germany).
  • Cathne - false positives for Amphetamines, Meth and Ecstasy (MDMA)
  • Centrax - may test positive for benzodiazepines
  • Cephradine - false positive for LSD
  • Cheracol - contains codeine
  • Cheracol Sinus - false positive for Amphetamines
  • Chinese herb pills - contain benzodiazepines
  • Chloroquine (Aralen®) - may test false positive for amphetamines
  • Chiorpromazlne - False-Positive for Amphetamine
  • Chlorazepate - Positive for Benzodiazepines
  • Chlordiazepoxide (Librium) - contains benzodiazepines
  • Chlordiazepoxide - may test positive for Benzodiazepines
  • Chlorpromazine (Thorazine) - false positive for Opiates (Also false for pregnancy)
  • Chlorpromazine (Thorazine) - may test false positive for PCP (l-phencyclohexylpiperidine, Phencyclidine)
  • Chlorpromazine - false positive for phenylketonuria, amylase, uroporphyrins, urobilinogen. May also cause false positive pregnancy test.
  • Chlorpromazine - false positive for phencyclidine
  • Chlorpromazine - false positive for Tricyclic Antidepressants (TCA) and LSD
  • Chlorpromazine (Thorazine®) - may test false positive for amphetamines
  • Cipro (Fluoroquinolone antibiotic) - false positives for opiates
  • Cipro XR (Fluoroquinolone) - false positive for opiates
  • Ciprofloxacin extended-release (Fluoroquinolone) - false positive for opiates
  • Ciprofloxacin (Fluoroquinolone) - false positive for opiates
  • Clinoril - false positive for THC, Marijuana
  • Clobazam (Frisium) - may test positive for Benzodiazepines
  • Clobenzorex - false positives for Amphetamines and Ecstasy
  • Clonazepam - is a benzodiazepine
  • Clonazepam - may test positive for Benzodiazepines
  • Clonopin - may test positive for Benzodiazepines
  • Clorazepate - may test positive for Benzodiazepines
  • Coca tea, Coca leaf, Coca flour, Coca oil - positive for cocaine
  • Co-codamol - positive for opiates
  • Codafen - positive for opiates
  • Codafen Continus - Positive for Opiates
  • Codeine - false positives for Amphetamines
  • Codeine - will test positive (not false) for opiates
  • Codeine Linctus - tests positive for opiates
  • Codeine Phosphate (Codafen Continus, Codeine Linctus, Pediatric BP, Galcodine, Kapake, Migraleve, Solpadol, Tylex) - tests positive for opiates
  • Codinal PH® - contains codeine
  • Co-dydramol - positive for opiates
  • Coffee-Break - false positive for Morphine
  • This product is no longer available in the USA or Canada.
  • Cold remedies with dextromethorphan - positive for opiates (heroin)
  • Comtrex - false positive for Opioids
  • Contac - false positive for Amphetamines, Morphine
  • Contac Severe Cold Formula - false positive for Morphine
  • Contact - false positives for Amphetamines, Meth and Ecstasy
  • Contact Non-Drowsy Formula Sinus Caplets - false positive for Amphetamines
  • Control - false positive for Morphine
  • Co-proximal - may test positive for Propoxyphene (PPX)
  • Coproximal - Positive for Propoxyphene
  • Cough medicines - See if any ingredients are on this list
  • Cough suppressants with Dextromethorphan (DXM) - false positive for Heroin (MDMA)
  • Cows head pills (Chinese herb) - contain benzodiazepines
  • Cramp End Tablets - false positive for THC, Marijuana
  • Cremacoat 4 - false positive for Morphine
  • Cyclimorph - positive for opiate
  • Cyclobenzaprine - false positive for Tricyclic Antidepressants (TCA)
  • Cylert - false positives for Amphetamines and Ecstasy
  • Cyproheptadine - false positive for Tricyclic Antidepressants (TCA)

D

  • Dalmane® - contains benzodiazepines
  • Darvocet - may test positive for Propoxyphene (PPX)
  • Darvon - may test positive for Propoxyphene (PPX)
  • Darvon® - contains synthetic opiates
  • Darvon - Positive for Propoxyphene
  • Datril - false positives for Marijuana
  • Daypro - false positives for benzodiazepines
  • Deconsal - contains codeine
  • Delorazepam (Briantum) - may test positive for benzodiazepines
  • Demerol - tests positive for opiates
  • Demetrin - may test positive for benzodiazepines
  • Deprenyl - false positives for Amphetamines and Ecstasy
  • Desipramine - false positives for LSD
  • Desipramine (Norpramine®) - may test false positive for amphetamines
  • Desoxyephedrine - false positive for Amphetamines and Ecstasy
  • Desoxyn - may test positive for methamphetamine
  • Desoyn® - contains d-methamphetamine
  • Dexamphetamine Sulphate - Positive for Amphetamine
  • Dexatrim - false positive for Ecstasy (MDMA), Meth
  • Dexdenfluramine - false positive for Amphetamines and Ecstasy
  • Dexedrine - is an Amphetamine
  • Dexedrine - may test positive for amphetamines
  • Dexfenfluramine - false positive for Amphetamines
  • Dexlansoprazole - PPIs may test positive for THC
  • Dextroamphetamine - false positive for Amphetamines
  • Dextroamphetamine - may test positive for amphetamines
  • Dextromethorphan (DXM) - false positive for Heroin, Opiates, Morphine
  • Dextromethorphan - may test false positive for PCP
  • Dextromethorphan hydrobromide or DXM - false positives for amphetamines
  • Dextropropoxyphene - may test positive for Propoxyphene (PPX)
  • DHC - may test positive for opiates
  • DHC Continus - Positive for Opiates
  • DHEA - false positive for anabolic steroid use
  • Diabetes - false positives for Amphetamines, Cocaine, THC, Ecstasy, Meth and Opiates
  • Diabismul® - contains opium/morphine
  • Diazemuls - may test positive for Benzodiazepines
  • Diazepam (Diazemuls, Stesolid, Valclair, Valium) - false positive for PCP
  • Diazepam (generic name for Valium) - contains benzodiazepines
  • Diazepam Diazemuls - Positive for Benzodiazepines
  • Diazepam - may test positive for Benzodiazepines
  • Didrex - false positive for Amphetamines
  • Didrex - metabolizes to methamphetamine and amphetamine
  • Diet aids with phenylpropanolamine (Dexatrim, Accutrim) - false positive for amphetamines
  • Dietac - false positive for Morphine
  • Dihydrocodeine (DHC Continus, Paramol, Remedeine, Remedeine Forte) - may test positive for opiates
  • Dihyrocodeine - contains synthetic opiates
  • Dilantin - false positives for Barbiturates
  • Dilaudid - may test positive for opiates
  • Dilaudid® - contains synthetic opiates
  • Diltiazem - false positive for LSD
  • Dimetane-DC Cough Syrup ® - contains codeine
  • Dimetapp - false positive for Amphetamines
  • Dimetapp - false positive for Morphine, Meth, Ecstasy
  • Note: Dimetapp is a brand name of the generic drug loratadine, which is also sold under the brand names Claritin, Alavert, Claritin Reditab, Claritin Hives Relief, Clear-Atadine, Clear-Atadine Children's, Loratadine Reditab, Ohm Allergy Relief, Tavist ND, Wal-itin, and Dimetapp ND.
  • Dimethylamphetamine - metabolizes to methamphetamine and amphetamine
  • Dimethylamylamine - false positive for amphetamines
  • Dinintel® - metabolizes to amphetamine
  • Diocalm - may test positive for opiates
  • Diphenhydramine - false positive for phencyclidine
  • Diphenhydramine - false positive for Tricyclic Antidepressants (TCA)
  • Diphenhydramine (Benadryl) - false positive PCP results
  • DMAA (dimethylamylamine) - false positive for amphetamines
  • d-Methamphetamine - HCL may test positive for methamphetamine
  • Doco children's cough syrup - false positive for Opioids
  • Dolobid - false positive for THC, Marijuana
  • Dolophine - may test positive for methadone
  • Dolophine® - contains synthetic opiates
  • Donnagel-PG ® - contains opium/morphine
  • Donnatal - may test positive for barbiturates
  • Donnatal® - contains barbiturates
  • Donnatol (for irritable bowel syndrome) - false positive for barbiturates
  • Dormonocet® - contains benzodiazepines
  • Doxepin - false positive for LSD
  • Doxepin - may test positive for Tricyclic Antidepressants
  • Doxylamine - false positive for phencyclidine, PCP, angel dust
  • Dristan Cold caplets - false positive for Amphetamines
  • Dristan Cough Formula - false positive for Heroin, Opiates, Morphine
  • Dristan Nasal Spray - false positive for Amphetamines
  • Drixoral Cold and Flu - false positive for Amphetamines
  • Dronabinol (Marinol) - shows positives for THC, marijuana
  • Duramorph - positive for opiates
  • Duramorph® - contains morphine
  • Durophet® - Amphetamines

E

  • E (slang) - may test positive for methamphetamine and ecstasy
  • Ecstasy (slang) - may test positive for methamphetamine and ecstasy
  • Edecrin - false positive for THC, Marijuana
  • Efavirenz - false positive for THC, Marijuana
  • Efavirenz (Sustiva®) - may test positive for THC
  • Effexor Tablets (venlafaxine hydrochloride) - false positive for PCP
  • Effexor XL - Potential Positive for PCP
  • Efidac/24 - false positive for Amphetamines
  • Efotamine - false positive for LSD
  • Elavil - false positives for opiates for up to three days, LSD, Methadone
  • Elavil - Positive for Tricyclic Antidepressants
  • Eldepryl - false positive for Amphetamines and Ecstasy
  • Elderpryl® - metabolizes to methamphetamine and amphetamine
  • Empirin w/codeine - false positive for Morphine, Opioids
  • Enoxacin - false-positive for opiates
  • Entersan - may test positive for opiates
  • Ephedra - false positives for Amphetamines and Ecstasy
  • Ephedrine - false positive for Amphetamines, Meth, and Ecstasy
  • Ephedrine-based compounds - false positives for Amphetamines and Ecstasy
  • Ephedrol, Ephedra (Ma Haung) - false positive for Amphetamines, Heroin, Opiates
  • Ergostat® - false positive for LSD
  • Esomeprazole - PPIs may test positive for THC
  • Estasule Minus - false positive for Amphetamines, Heroin, Opiates
  • Estazolam - may test positive for Benzodiazepines
  • Etafediabe - false positive for Amphetamines, Meth and Ecstasy
  • Ethylamphetamine - metabolizes to amphetamine
  • Ethylmorphine - may test positive for opiates
  • Eve (slang) - may test positive for amphetamines
  • Excedrin IB - false positives for Marijuana (Cannabis) THC

F

  • Factive (Fluoroquinolone) - false positive for opiates
  • Famprofazone - false positive for Amphetamines and Ecstasy
  • Feldene - false positives for THC
  • Fencamine - metabolizes to methamphetamine and amphetamine
  • Fenelylline - false positive for Amphetamines and Ecstasy
  • Fenfluramine - false positive for Ecstasy
  • Fenfluramine (Fen Phen) - may test false positive for amphetamines
  • Fenoprofin - false positive for Marijuana, Amphetamines, Barbiturates
  • Fenproporex - metabolizes to amphetamine
  • Fenproyorex - false positive for Amphetamines and Ecstasy
  • Fentanyl - false positive for LSD (Reference: 47)
  • Finedal® - metabolizes to amphetamine
  • Fioricet - may test positive for Barbiturates
  • Fiorinal - may test positive for Barbiturates
  • Fiorinal known to produce a false positive for phenobarbital
  • Fiorinal w/codeine - false positive for Morphine
  • Floxin (Fluoroquinolone) - false positive for opiates
  • Flunitrazepam - may test positive for Benzodiazepines
  • Fluoroquinolone antibiotics - false positive for opiates
  • Fluoxetine (Prozac) - false positives for amphetamines and LSD
  • Flurazepam - contains benzodiazepines (Reference: 18)
  • Flurbiprofen - false positive for marijuana
  • Fluroquinolones (Levaquin®) - may test false positive for opiates
  • Fluspirilene - may test positive for amphetamines
  • Frisium - may test positive for Benzodiazepines
  • Furfenorex - metabolizes to methamphetamine and amphetamine

G

  • Galcodine - may test positive for opiates
  • Galenphol - may test positive for opiates
  • Gamanil - may test positive for Tricyclic Antidepressants
  • Gemifloxacin (Fluoroquinolone) - false positive for opiates
  • Genpril - false positive for THC, Marijuana
  • Gradumet® - contains d-methamphetamine
  • Halcion - Positive for Benzodiazepines (Reference: 52)
  • Haloperidol - false positive for LSD
  • Haltran - false positive for THC, Marijuana
  • Hamantashen - may test positive for opiates.
  • Hempseed Oil (Cannabis Seed/Hemp Oil) - false positive for THC
  • Hold Cough Suppressant - false positive for Heroin, Opiates, Morphine
  • Homatropine Methylbromide - contains synthetic opiates
  • Hycodan® - contains synthetic opiates
  • Hydergine - false positive for LSD
  • Hydrocodone - false positive for oxycodone
  • Hydrocodone Bitartrate - contains synthetic opiates
  • Hydrocodone - contains synthetic opiates
  • Hydrocodone - may test positive for opiates
  • Hydromorphone (Dilaudid®) - contains synthetic opiates
  • Hydromorphone - may test positive for opiates
  • Hydromorphone (Dilaudid®) - may test false positive for oxycodone
  • Hydrostat - may test positive for opiates
  • Hydroymethamphetamone - false positive for Amphetamines

I

  • Ibuprin - false positive for marijuana
  • Ibuprofen - false positive for Marijuana (THC)
  • Ifenoprofen - false positive for THC, Marijuana
  • Imitrex Hydergine® - may test false positive for LSD
  • Indocin - false positive for THC, Marijuana
  • Indocin - could affect urine drug test results
  • Infantol Pink ® - contains opium/morphine
  • Infumorf - contains morphine
  • Isoclor Expectorant - contains codeine

K

  • Kaodene with Paregoric® - contains opium/morphine
  • Kapake - may test positive for opiates
  • Kenesed® - contains barbiturates
  • Kapidex - PPIs may test positive for THC
  • Ketamine - false positive for PCP
  • Ketoprofen - false positive for THC
  • Kidney disease - false positive for Cocaine
  • Kidney infection - false positive for Amphetamines, THC, Ecstasy, and Opiates
  • Klonopin - may test positive for Benzodiazepines
  • Klonopin® - contains benzodiazepines
  • Koalin and Morphine Mixture - may test positive for opiates

L

  • Labetolol - false positive for LSD
  • Lansoprazole - PPIs may test positive for THC
  • Lerisum - may test positive for Benzodiazepines
  • Ketipinor (quetiapine) - false-positives for amphetamines
  • Labetalol (Labetalol) - may test false positive for amphetamines
  • Lamotrigine (Lamictal®) - false positive for PCP
  • Lentizol - Positive for Tricyclic Antidepressants
  • Lerisum - Positive for Benzodiazepines
  • Levaquin® (Fluoroquinolone) - false positive for opiates
  • Levofloxacin (Fluoroquinolone antibiotic) - false positives for opiates
  • Lexotan - may test positive for benzodiazepines
  • Libritab® - contains benzodiazepines
  • Librium - may test positive for Benzodiazepines
  • Librium® - contains benzodiazepines
  • Limbitrol® - contains benzodiazepines
  • Lisuride - false positive for LSD
  • Liver Disease - false positive for Opiates, Ecstasy, THC and Amphetamines
  • l-Methamphetamine HCL - may test positive for methamphetamine
  • Lodine - false positive for THC, Marijuana
  • Lofepramine - may test positive for Tricyclic Antidepressants
  • Lomont - may test positive for Tricyclic Antidepressants
  • Loprazolam - contains benzodiazepines
  • loratadine (Dimetapp) - false positive for Amphetamines
  • Lorazepam - contains benzodiazepines
  • Lorazepam - may test positive for Benzodiazepines
  • Lorcet - may test positive for opiates
  • Lormetazepam - may test positive for Benzodiazepines
  • Lortab - an opioid analgesic
  • Love Drug (slang) - may test positive for amphetamines
  • Luminal - may test positive for barbiturates
  • Luminal® - contains barbiturates
  • Lysergol - false positive for LSD

M

  • Ma Huang (Ephedra sinica) - false positives for Amphetamines and Ecstasy
  • Marax - false positive for Ecstasy (MDMA), Meth
  • Margestic - false positive for Opioids
  • Marinol® - shows positive for Marijuana (THC)
  • Maximum Strength Sine-aid - false positive for Amphetamines
  • Maximum Strength Sudafed Sinus - false positive for Amphetamines
  • Maximum Strength Tylenol Sinus gelcaps - false positive for Amphetamines
  • Meclomen - false positive for THC, Marijuana
  • Medacepan - may test positive for Benzodiazepines
  • Medazepam - may test positive for Benzodiazepines
  • Medipren - false positive for THC, Marijuana
  • Mediprim - false positive for marijuana
  • Mefenorex - false positive for Amphetamines and Ecstasy
  • Menstrual cramp medications - like Midol and Trendar
  • Meperidine - false positive for phencyclidine
  • Mephentermine - false positive for Amphetamines and Ecstasy
  • Mesocarb - false positive for Meth and Ecstasy
  • Methadone - contains synthetic opiates
  • Methadone Hydrochloride - may test positive for methadone
  • Methadose - may test positive for methadone
  • Methamprex - may test positive for methamphetamine
  • Methedrine - may test positive for methamphetamine
  • Methoxyphenamine - false positive for Amphetamines and Ecstasy
  • Methphenidate - false positive for Amphetamines and Ecstasy
  • Methylenedioxyamphetamine (MDA) - may test positive for amphetamines
  • Methylenedioxymethamphetamine (MDMA) - may test positive for methamphetamine and ecstasy
  • Methylphenidate (Ritalin) - an Amphetamine-like stimulant
  • Methysergiside - false positive for LSD
  • Metoclopramide - false positive for LSD
  • Metronidazole - can cause interference on EMIT assays that invalidates results
  • Mexiletine (Mexitil®) - may test false positive for amphetamines
  • Midol - false positive for THC, Marijuana
  • Migraleve - may test positive for opiates
  • Mini-thins - false positives for Amphetamines and Ecstasy
  • Miracle herb pills (Chinese herb) - contain benzodiazepines
  • Mogadon - may test positive for benzodiazepines
  • Morax - false positive for Amphetamines, Heroin, Opiates
  • Morazone - false positive for Meth and Ecstasy
  • Morcap - positive for opiates
  • Morphine Sulfate, including the trade names Astramorph, Cyclimorph, Duramorph, Morcap, MS Contin, Oramorph, Roxanol, and Severedol - positive for opiates
  • Motrin - false positive for THC, Marijuana
  • Moxifloxacin (Fluoroquinolone) - false positive for opiates
  • MS Contin - positive for opiates
  • MS Contin Tablets® - contain morphine
  • MSIR® - contains morphine
  • Mudrane GC® - contains barbiturates

N

  • Naldecon - false positive for Morphine
  • Nalfon - false positive for Marijuana, Amphetamines, Barbiturates, Benzodiazephines, Methaqualone
  • Naprosyn - false positive for THC, Marijuana
  • Naproxen (Aleve) - false positive for THC, Marijuana
  • Nasal sprays (Vicks inhaler, Afrin) - false positive for Amphetamines and Ecstasy
  • Navonaprox - false positive for THC, Marijuana
  • Nembutal - may test positive for barbiturates
  • Nembutal Sodium - contains barbiturates
  • Neosynephren - false positive reading for Amphetamines
  • Neosynephrine - False positive for Amphetamines
  • Nexium - PPIs may test positive for THC
  • Nitrazepam - may test positive for benzodiazepines
  • Nobritol - may test positive for Benzodiazepines
  • Nobrium - may test positive for Benzodiazepines
  • Noctamide - may test positive for Benzodiazepines
  • Nonprescription products that contain opium - (i.e., morphine)
  • Norcyclobenzaprine - false positive for Tricyclic Antidepressants (TCA)
  • Norflex - false positive for Morphine
  • Norfloxacin (Fluoroquinolone) - false positive for opiates
  • Noroxin (Fluoroquinolone) - false positive for opiates
  • Novahistine DH® - contains codeine
  • Novahistine Expectorant® - contains codeine
  • Novocain - may test positive for Opiates
  • NSAIDS - false positive for THC, Marijuana
  • Nucofed Expectorant - contains codeine
  • Numorphan® - contains synthetic opiates
  • Nuprin - false positive for THC
  • Nyquil - false positive for Amphetamines, Heroin, Opiates, Morphine, Meth, Ecstasy, Methadone

O

  • Obetrol® - Amphetamines
  • Ofloxacin (antibiotic) - false positives for opiates
  • Omeprazole - PPIs may test positive for THC
  • Opazimes - may test positive for opiates
  • Oramorph - positive for opiates
  • Oramorph - contains morphine
  • Ornade - false positive for Amphetamines
  • Ortain - false positive for Amphetamines
  • Orudis KT - false positives for THC
  • Oxaprozin - false positive for THC, Marijuana, Benzodiazepines
  • Oxaprozin (Daypro™) - may test false positive for benzodiazepines
  • Oxazepam - contains benzodiazepines
  • Oxazepam - will test positive for benzodiazepines (not false)
  • Ox-pam - may test positive for benzodiazepines
  • Oxycodone (Oxycontin) - contains synthetic opiates
  • Oxymorphone - contains synthetic opiates
  • Oxymorphone (Numorphan) - may test false positive for oxycodone

P

  • Pamprin® - false positive for THC, Marijuana
  • Pantoprazole (Protonix) - false positive for THC
  • Papaverine (Papaverine) - may test false positive for opiates
  • Paracetamol with codeine - positive for opiates
  • Paracodine® - contains synthetic opiates
  • Paramol - may test positive for opiates
  • Paregoric - contains opium/morphine
  • Par-Glycerol-C (CV) - contains codeine
  • Pavacol-D - may test positive for opiates
  • Pedacare - false positive for Opioids
  • Pediacof® - contains codeine
  • Pediatric - may test positive for opiates
  • Pediatric BP - Positive for Opiates
  • Pefloxacin - false positive for Opiates
  • Pemoline - false positive for Amphetamines and Ecstasy
  • Pentobarbital - may test positive for barbiturates
  • Pentobarbital Sodium - contains barbiturates
  • Percocet - will test positive (not false) for opiates
  • Percodan - contains Oxycodone
  • Percodan® - contains synthetic opiates
  • Percovil - will test positive (not false) for opiates
  • Perphenazine - false positive for Tricyclic Antidepressants (TCA)
  • Phendimetrazine - false positive for Amphetamines and Ecstasy
  • Phenegan-D - false positive for Amphetamines, Ecstasy (MDMA), Meth
  • Phenergan VC® - contains codeine
  • Phenergan® - false positive for THC, Methadone
  • Phenmetrazine - false positive for Amphetamines and Ecstasy
  • Phenobarbital - contains barbiturates
  • Phenobarbital - may test positive for barbiturates
  • Phenobarbital - may cause false-positive phentolamine test results.
  • Phenobarbitone - may test positive for barbiturates
  • Phenteramine - false positives
  • Phentermine - false positive for Amphetamines and Ecstasy on urine tests
  • Phentermine - cross reactant for methamphetamine
  • Phenylephrine - false positive for Amphetamines
  • Phenylpropanolamine - false positive for amphetamines
  • Phenylpropanolamine (PPA) - false positive for Meth
  • Phenypropanolamine - false positive reading for Amphetamines
  • Phenytoin (Dilantin®) - may test false positive for barbiturates
  • Pholcodine - may test positive for opiates
  • Pholedrine - false positive for Amphetamines, Meth and Ecstasy
  • Physetone - may test positive for methadone
  • Poly-Histine - contains codeine
  • Pondinil® - metabolizes to amphetamine
  • Poppy Seeds contain morphine - positive for Heroin (MDMA), Opiates
  • Potentsex pills (Chinese herb) - contain benzodiazepines
  • Prazepam - may test positive for benzodiazepines
  • Prenylamine - metabolizes to amphetamine
  • Preparations - positive for opiates
  • Prescription sleeping pills - may test positive for Benzodiazepines
  • Prevacid - PPIs may test positive for THC
  • Prilosec - PPIs may test positive for THC
  • Primatine Tablets - false positive for Ecstasy (MDMA), Meth
  • Primidone (Mysoline®) - may test false positive for barbiturates
  • Procainamide (Procainamide) - may test false positive for amphetamines
  • Procaine - Positive for Opiates
  • Prochlorperazine - false positive for LSD
  • Promethazine - false positive for THC
  • Promethegan - false positive for THC
  • Propoxyphene - contains synthetic opiates
  • Propranolol (Inderal®) - may test false positive for amphetamines
  • Propylephedrine - false positive for Amphetamines and Ecstasy
  • Proquin XR (Fluoroquinolone) - false positive for opiates
  • ProSom - may test positive for Benzodiazepines
  • Proton pump inhibitors - false positive for THC
  • Protonix - false positive for THC
  • Prozac (Fluoxetine Hydrochloride) - false positives for amphetamines
  • Pseudoephederine (Claritin-D®/Sudafed®) - false positives for amphetamines and ecstasy
  • Pseudoephedrine - may be detected as amphetamines (speed)
  • Pseudoephedrine - may test positive for amphetamines
  • Pseudoephedrineare - false positive for amphetamines
  • Purim cookies - contain poppy seeds, false positive for opiates
  • Pylorid - may test positive for methamphetamines

Q

  • Quadrinal® - false positive for Amphetamines, Heroin, Opiates
  • Quelichine - false positive for Amphetamines, Heroin, Opiates
  • Quelidrine - false positive for Amphetamines, Heroin, Opiates
  • Quetiapine (Seroquel) - false positive for amphetamines
  • Quibron Plus - false positive for Amphetamines, Heroin, Opiates
  • Quinine in Tonic water - positive for opiates
  • Quinacrine (Atabrine/Mepacrine) - may test false positive for amphetamines

R

  • Rabeprazole - PPIs may test positive for THC
  • Ranitidine - may show false positive for Amphetamines
  • Ranitidine - may test positive for methamphetamines
  • Rantidine (Zantac®) - may test false positive for amphetamines
  • Redux - false positive for Amphetamines, Meth and Ecstasy
  • Relafen - false positive for Marijuana
  • Remedeine Forte - may test positive for opiates
  • Remedeine - may test positive for opiates
  • Remedine - positive for opiates
  • Rescudose - contains morphine
  • Restoril (Temazepam) - is a benzodiazepine
  • Rexatal® - contains barbiturates
  • Riboflavin (vitamin B2) - false positive for THC
  • Rifampicin (antibiotic) - false positive for Opioids
  • Rifampin - false positive for Opiates
  • Risperidone - false positive for LSD
  • Ritalin® - an Amphetamine-like stimulant (
  • Rivotril - may test positive for Benzodiazepines
  • Rivotril® - contains benzodiazepines
  • Robitussin - positive for opiates
  • Robitussin A-C® - contains codeine
  • Robitussin Cold and Flu - false positive for Ecstasy (MDMA), Meth
  • Robitussin DAC® - contains codeine
  • Robitussin DM - false positive for Heroin, Opiates, Morphine
  • Rohypnol - may test positive for Benzodiazepines
  • Romilar - false positive for Heroin, Opiates, Morphine
  • Roxanol - positive for opiates
  • Roxanol - contains morphine
  • Roxicet - contains Oxycodone
  • Rufin - false positive for THC, Marijuana

S

  • Secobarbital - contains barbiturates
  • Secobarbital - may test positive for barbiturates
  • Secobarbital Sodium Bellergal-S® - contains barbiturates
  • Seconal - may test positive for barbiturates
  • Seconal Sodium - contains barbiturates
  • Selegiline (Eldepryl) - false positive for Meth, Amphetamines and Ecstasy
  • Sensorcaine - may test false positive for cocaine
  • Serax - may test positive for benzodiazepines
  • Serax® - contains benzodiazepines
  • Seroquel (quetiapine) - false-positives for amphetamines
  • Sertraline - false positives for benzodiazepines and LSD
  • Sertraline - may test positive for benzodiazepines
  • Severedol - positive for opiates
  • Silexin - false positive for Heroin, Opiates, Morphine
  • Sinarest - false positive for Amphetamines, Morphine
  • Sine-Off - false positive for Morphine
  • Sinequan - may test positive for Tricyclic Antidepressants
  • Sinex - false positive for Amphetamines
  • Sinubid - false positive for Morphine
  • Sinus Excedrin Extra Strength Caplets - false positive for Amphetamines
  • Solfoton® - contains barbiturates
  • Solpadol - positive for opiates
  • Solpadol - may test positive for opiates
  • Soma - false positive for Morphine
  • Somnite - may test positive for benzodiazepines
  • Soneryl - may test positive for Barbiturates
  • St. Joseph's Cough Syrup - false positive for Heroin, Opiates, Morphine
  • Stesolid - may test positive for Benzodiazepines
  • Strong BP - may test positive for opiates
  • Suboxone (Buprenorphine) - may test false positive for oxycodone
  • Sudafed - false positive for Amphetamines, Meth and Ecstasy
  • Sudafed - may test positive for amphetamines
  • Sustiva (Efanirenz) - false positive for THC or Marijuana
  • Sustiva - may test positive for THC
  • Synalgos DC® - contains synthetic opiates

T

  • Tavist-D - false positive for Meth and Ecstasy
  • Tedral - false positive for Amphetamines, Heroin, Opiates
  • Tegisec® - metabolizes to amphetamine
  • Temazepam (Restoril) - is a benzodiazepine
  • Thebacon - may test positive for opiates
  • Thioridazine (Mellaril) - false positive for phencyclidine (PCP) and LSD
  • Thioridazine - false positive for Tricyclic Antidepressants (TCA)
  • Thorazine - false positives
  • Tolectin® - false positive for THC, Marijuana
  • Tolmetin - can cause interference on EMIT assays that invalidates results.
  • Tonic water - false positive for cocaine
  • Tranxene - may test positive for Benzodiazepines
  • Trazodone (trazadone, trazedone) - false positive for amphetamines
  • Trazodone - false positive for LSD
  • Trendar Cramp Relief Formula - false positive for THC, Marijuana
  • Triaminic 12 - false positive for Amphetamines
  • Triaminicin - false positive for Amphetamines, Morphine
  • Triazolam (Halcion) - Positive for Benzodiazepines
  • TriazolamHalcion® - contains benzodiazepines
  • Tricyclic antidepressants - may produce false-positive results for amphetamines
  • Trimethobenzamide - false positives
  • Trimeprazine - false positive for Tricyclic Antidepressants (TCA)
  • Triminicol - false positive for Morphine
  • Triprolidine - false positive for LSD
  • Triptafen - Positive for Tricyclic Antidepressants
  • Triptafen-M - Positive for Tricyclic Antidepressants
  • Trucal - false positive for Heroin, Opiates, Morphine
  • Tryptizol - Positive for Tricyclic Antidepressants
  • Tuinal - Positive for Barbiturates
  • Tussagesic - false positive for Morphine
  • Tussaminic - false positive for Heroin, Opiates, Morphine
  • Tussar 2® - contains codeine
  • Tussar SF® - contains codeine
  • Tussinic - false positive for Heroin, Opiates, Morphine
  • Tussi-Organiden - contains codeine
  • Tylenol 3 - may cause positive for opiates
  • Tylenol 3 - positive for opiates
  • Tylenol 4 - may cause positive for opiates
  • Tylenol Cold (combination) - may test positive for amphetamines
  • Tylenol Simply Sleeps (Diphenhydramine) - false positive PCP results
  • Tylenol Sinus - false positives for Amphetamines and Ecstasy
  • Tylenol Sinus gelcaps, Maximum Strength - false positive for Amphetamines
  • Tylenol with codeine - Positive for Opiates
  • Tylex - positive for opiates
  • Tylex - may test positive for opiates

U

  • Tramadol (Ultram) - may test false positive for phencyclidine (PCP) and methadone
  • Unisom Nighttime Sleep Aid - false positive for Morphine

V

  • Valclair - may test positive for Benzodiazepines
  • Valerian Root and extract - false positives for Benzodiazepines
  • Valium - may test positive for Benzodiazepines
  • Valium® (Diazepam) - contains benzodiazepines
  • Valrelease® - contains benzodiazepines
  • Venlafaxine hydrochloride (Effexor) - false positive for PCP
  • Verapamil - false positive for LSD
  • Vicks Cough Syrup - false positive for Heroin, Opiates, Morphine
  • Vicks Formula 44M - false positive for heroin, Methadone
  • Vicks Inhaler - false positive for Ecstasy (MDMA), Meth
  • Vick's Inhaler - may test positive for methamphetamine
  • Vicks Nyquil - false positive for Ecstasy (MDMA), Meth
  • Vicodin ES® - contains synthetic opiates
  • Vicodin - may test positive for opiates
  • Vitamin B2 - false positive for THC
  • Vivacaine - may test false positive for cocaine
  • Voltaren - false positive for THC, Marijuana

W

  • Wellbutrin - false positive for Amphetamines
  • Wigraine® - false positive for LSD
  • Wygesic - will test positive (not false) for opiates

X

  • Xanax - Positive for Benzodiazepines
  • Xanax® (Niravam, Alprazolam) - contains benzodiazepines
  • Xepin - may test positive for Tricyclic Antidepressants
  • XTC (slang) - may test positive for methamphetamine and ecstasy

Z

  • Zantac (ranitidine) - may test positive for methamphetamines
  • Zantac (ranitidine) - may test positive for amphetamines
  • Zegerid - PPIs may test positive for THC
  • Zoloft - may test false positive for benzodiazepines
  • Zoloft - may test positive for benzodiazepines
  • Zyrtec-D - contains pseudoephedrine that may cause a false positive for amphetamines
substances_that_cause_false_positives.txt · Last modified: 2014/11/17 16:59 (external edit)