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False Positives

What is a false positive? It is a test result that is returned when a substance tests positive for another compound. 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 useage, they are probably not required to use a certified drug testing lab, which means you have a greater chance of getting a false positive.

Listed below are products reported to cause a false positive drug test result on a urine drug test. With your help, this will grow into a comprehensive list.

Note that this list does NOT apply to those tests that are confirmed by GC/MS testing.

Last updated, April 20, 2010.

Substances that cause false positives

4-Way Nasal Spray - false positive for Amphetamines, Morphine (Ref: 1, 2, 7)
Accutrim - false positive for Ecstasy (MDMA), Meth (Ref: 11, 16, 18)
Acetaminoph w/codeine - false positive for Morphine (Ref: 1)
Acet-AM - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Acro-Lase Plus® contains barbiturates (Ref: 18)
Adam (slang) may test positive for methamphetamine and ecstasy (Ref: 33)
Afrinol may test positive for amphetamines (Ref: 33)
A.P.C. w/codeine - false positive for Morphine (Ref: 1)
A.R.M. - false positive for Amphetamines (Ref: 3, 18)
Actifed - false positive for Amphetamines (Ref: 2, 3, 7, 18)
Actifed with Codeine Cough Syrup® (Ref: 18)
Adderall - is an amphetamine, positive for Meth (Ref: 2008 PDR, 18, 19)
Advil - false positive for THC, Marijuana (Ref: 1, 14, 16, 18, 20, 26, 29) (Ref. 22 says NO)
Afrin - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Aleve - false positive for THC, Marijuana (Ref: 3, 16, 18)
Alka-Seltzer - false positive for Amphetamines (Ref: 2, 7)
Alka-Seltzer Plus - false positive for Amphetamines, Morphine (Ref: 1, 2, 7)
Allerest - false positive for Amphetamines, Ecstasy, Meth and Morphine (Ref: 1, 2, 3, 7, 11, 16, 18)
Allobarbital may test positive for Barbiturates (Ref: 33)
Alphenol may test positive for Barbiturates (Ref: 33)
Alprazolam contains benzodiazepines (Ref: 18, 33)
Amantadine (Ref: 32)
Ambenyl contains codeine (Ref: 18)
Amesec - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Amfepramone - false positive for Amphetamines, Ecstasy (MDMA), Meth (Ref: 3, 11, 16)
Amifepramone - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Amineptine - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Amitriptyline - false positive for LSD (Ref: 3, 47)
Amitriptyline may test positive for Tricyclic Antidepressants (TCA) (Ref: 33)
Amobarbital may test positive for barbiturates (Ref: 33)
Amogel PG® contains opium/morphine (Ref: 18)
Amoxicillin - false positive for cocaine (Ref: 13, 16, 18, 20, 21, 26, 29)
Ampicillin - false positive for cocaine (Ref: 29)
Amphetaminil metabolizes to amphetamine (Ref: 18)
Ampicin - may cause false positive for opiates (Ref: 20)
Anaprox - false positive for THC, Marijuana (Ref: 1, 3, 18)
Ansaid - false positive for marijuana (Ref: 3)
Anti Anxiety medication, most - false positive for benzodiazepines (Ref: 3)
Anti Inflammatories such as Naproxyn (Ref: 26)
Antiasthmatics that contain phenobarbitol - false positive for barbiturates (Ref: 3)
Antihistamines in general - false positives for Methadone (Ref: 43)
Antibiotics - false positives for Heroin, Cocaine (Ref: 13, 18, 20)
Antrocol Elixor® contains barbiturates (Ref: 18)
Anxitol may test positive for Benzodiazepines (Ref: 33)
Apo-Naproxen - false positive for THC, Marijuana (Ref: 1)
Aprobarbital may test positive for barbiturates (Ref: 33)
Artane - false positive for LSD (Ref: 3)
Ascriptin w/codeine - false positive for Morphine (Ref: 1)
Aspirin with Codeine (Ref: 18)
Asthma medications - false positives for Amphetamines and Ecstasy (Ref: 20, 21)
Astramoprh PF ® contains morphine (Ref: 18)
Ativan® (lorazepam) contains benzodiazepines (Ref: 18)
Atripla - false positive for cannabinoid THC (Ref: 39)
B2 vitamin - false positive for THC (Ref: 21)
Barbital may test positive for barbiturates (Ref: 33)
Bayer Select Maximum Strength Sinus Pain Relief Caplets - false positive for Amphetamines (Ref: 3, 18)
Bayer Select Pain Relief Formula - false positive for THC, Marijuana (Ref: 3, 18)
Benadryl (Diphenhydramine) - false positives for Benzodiazepines, PCP, Tricyclic Antidepressants (Ref: 24, 45)
Bentyl® - false positive for LSD , Methadone (Ref: 3, 18, 43)
Benylin - false positive for Opioids (Ref: 3)
Benzatropine/Artane® (Ref: 18)
Benzedrine® - Amphetamines (Ref: 18)
Benzphetamine - false positives for Amphetamines, Ecstasy, and LSD (Ref: 3, 11, 18, 47)
Biphetamine® for Amphetamines (Ref: 18)
Black Pearls (Tung Sheuh pills) contain benzodiazepines (Ref: 32)
Briantum may test positive for benzodiazepines (Ref: 33)
Bromazepam may test positive for benzodiazepines (Ref: 33)
Bromocriptine/Parlodel® (Ref: 18)
Bromocription - false positive for LSD (Ref: 3)
Bromphenlramlne - false-Positive for Amphetamine (Ref: 22)
Broncholate CS contains codeine (Ref: 18)
Bronkaid - false positive for Amphetamines, Heroin, Opiates, Ecstasy, Meth (Ref: 1, 3, 16, 18)
Bronkotabs - false positive for Amphetamines, Heroin, Opiates (Ref: 1, 11)
Buprenex® contains synthetic opiates (Ref: 18)
Buprenorphine contains synthetic opiates (Ref: 18)
Bupropion (Wellbutrin) - false positive for Amphetamines (Ref: 12, 31, 32)
Buproprion - false positive for LSD (Ref: 47)
Buspirone - false positive for LSD (Ref: 47)
Butabarbital may test positive for Barbiturates (Ref: 33)
Butalbital may test positive for Barbiturates (Ref: 33)
Butisol may test positive for Barbiturates (Ref: 33)
Cafergot® - false positive for LSD (Ref: 3, 18)
Caldecon - false positive for Amphetamines, Morphine (Ref: 1, 2, 7,)
Capital and Codeine Oral Solution - false positive for Opioids (Ref: 3, 18)
Captagon® metabolizes to amphetamine (Ref: 18)
Carbamazepine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Cathne - false positives for Amphetamines, Meth and Ecstasy (MDMA) (Ref: 3, 11, 16)
Centrax may test positive for benzodiazepines (Ref: 33)
Cephradine - false positive for LSD (Ref: 47)
Cheracol contains codeine (Ref: 18)
Cheracol Sinus - false positive for Amphetamines (Ref: 3)
Chinese herb pills contain benzodiazepines (Ref: 32)
Chiorpromazlne - False-Positive for Amphetamine (Ref: 22, 26)
Chlordiazepoxide contains benzodiazepines (Ref: 18)
Chlordiazepoxide may test positive for Benzodiazepines (Ref: 33)
Chlorpromazine - false positive for Opiates (Also false for pregnancy) (Ref: 23, 32)
Chlorpromazine - false positive for phencyclidine (Ref: 32)
Chlorpromazine - false positive for Tricyclic Antidepressants (TCA) and LSD - (Ref: 46, 47)
Cipro (antibiotic) - false positives for opiates (Ref: 25, 32)
Clinafloxacin - (Ref: 25)
Clinoril - false positive for THC, Marijuana (Ref: 3, 18)
Clobazam may test positive for Benzodiazepines (Ref: 33)
Clobenzorex - false positives for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Clonazepam contains benzodiazepines (Ref: 18)
Clonazepam may test positive for Benzodiazepines (Ref: 33)
Clonopin may test positive for Benzodiazepines (Ref: 33)
Clorazepate may test positive for Benzodiazepines (Ref: 33)
Coca tea, Coca leaf, Coca flour, Coca oil - positive for cocaine (Ref: 41)
Co-codamol - positive for opiates (Ref: 33)
Codafen - positive for opiates (Ref: 33)
Codafen may test positive for opiates (Ref: 33)
Codeine - false positives for Amphetamines (Ref: 14)
Codeine - will test positive (not false) for opiates (Ref: 20)
Codeine Linctus may test positive for opiates (Ref: 33)
Codeine Phosphate may test positive for opiates (Ref: 33)
Codinal PH® contains codeine (Ref: 18)
Co-dydramol - positive for opiates (Ref: 33)
Coffee-Break - false positive for Morphine (Ref: 1)
Cold remedies with dextromethorphan - positive for opiates (heroin) (Ref: 21)
Combivent inhaler - false positive for meth in urine tests (Ref: 19)
Comtrex - false positive for Opioids (Ref: 3)
Concerta - false positive for meth in urine tests (Ref: 19)
Contac - false positive for Amphetamines, Morphine (Ref: 1, 7, 20)
Contac Severe Cold Formula - false positive for Morphine (Ref: 43)
Contact - false positives for Amphetamines, Meth and Ecstasy (Ref: 2, 3, 7, 11, 16, 18)
Contact Non-Drowsy Formula Sinus Caplets - false positive for Amphetamines (Ref: 3, 18)
Control - false positive for Morphine (Ref: 1)
Co-proximal may test positive for Propoxyphene (PPX) (Ref: 33)
Cough medicines - See if any ingredients are on this list (Ref: 6, 20)
Cough suppressants with Dextromethorphan (DXM) - false positive for Heroin (MDMA) (Ref: 16)
Cows head pills (Chinese herb) contain benzodiazepines (Ref: 32)
Cramp End Tablets - false positive for THC, Marijuana (Ref: 3, 18)
Cremacoat 4 - false positive for Morphine (Ref: 43)
Cyclimorph - positive for opiates (Ref: 33)
Cyclobenzaprine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Cylert - false positives for Amphetamines and Ecstasy (Ref: 3, 11)
Cyproheptadine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Dalmane® contains benzodiazepines (Ref: 18)
Darvocet may test positive for Propoxyphene (PPX) (Ref: 33)
Darvon may test positive for Propoxyphene (PPX) (Ref: 33)
Darvon® contains synthetic opiates (Ref: 18)
Datril - false positives for Marijuana (Ref: 1)
Daypro - false positives for benzodiazepines (Ref: 34)
Deconsal contains codeine (Ref: 18)
Delorazepam may test positive for benzodiazepines (Ref: 33)
Demerol - tests positive for opiates (Ref: 26, 29)
Demetrin may test positive for benzodiazepines (Ref: 33)
Deprenyl - false positives for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Desipramine - false positives for LSD (Ref: 32, 47)
Desoxyephedrine - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Desoxyn may test positive for methamphetamine (Ref: 33)
Desoyn® contains d-methamphetamine (Ref: 18)
Dexatrim - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Dexdenfluramine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Dexedrine is an Amphetamine (Ref: 3, 11, 18)
Dexedrine may test positive for amphetamines (Ref: 33)
Dexfenfluramine - false positive for Amphetamines (Ref: 3, 11)
Dextroamphetamine - false positive for Amphetamines (Ref: 3)
Dextroamphetamine may test positive for amphetamines (Ref: 33)
Dextromethorphan - false positive for Heroin, Opiates, Morphine (Ref: 1, 3, 16, 21, 26, 29, 32)
Dextromethorphan hydrobromide or DXM - false positives for amphetamines (Ref: 6, 11)
Dextropropoxyphene may test positive for Propoxyphene (PPX) (Ref: 33)
DHC may test positive for opiates (Ref: 33)
DHEA - false positive for anabolic steroid use (Ref: 13)
Diabetes - false positives for Amphetamines, Cocaine, THC, Ecstasy, Meth and Opiates (Ref: 3, 15, 16, 20, 21)
Diabismul® contains opium/morphine (Ref: 18)
Diazemuls may test positive for Benzodiazepines (Ref: 33)
Diazepam - false positive for PCP (Ref: 29)
Diazepam (generic name for Valium) - contains benzodiazepines (Ref: 18, 20, 26)
Diazepam may test positive for Benzodiazepines (Ref: 33)
Dicyclomine (Ref: 18)
Didrex - false positive for Amphetamines (Ref: 3, 11)
Diet aids with phenylpropanolamine (Dexatrim, Accutrim) - false positive for Amphetamines (Ref: 11, 16, 18)
Diet aids with phenylpropanolamine (Dexatrim, Accutrim) - false positive for amphetamines (Ref: 2, 10, 16)
Dietac - false positive for Amphetamines (Ref: 7)
Dietac - false positive for Morphine (Ref: 1, 2, 7)
Dihydrocodeine may test positive for opiates (Ref: 33)
Dihyrocodeine contains synthetic opiates (Ref: 18)
Dilantin - false positives for Barbiturates (Ref: 3, 20)
Dilaudid may test positive for opiates (Ref: 33)
Dilaudid® contains synthetic opiates (Ref: 18)
Diltiazem - false positive for LSD (Ref: 47)
Dimetane-DC Cough Syrup ® contains codeine (Ref: 18)
Dimetapp - false positive for Amphetamines (Ref: 3, 7)
Dimetapp - false positive for Morphine, Meth, Ecstasy (Ref: 1, 2, 7, 11, 16, 18)
Dimethylamphetamine metabolizes to methamphetamine and amphetamine (Ref: 18)
Dinintel® metabolizes to amphetamine (Ref: 18)
Diocalm may test positive for opiates (Ref: 33)
Diphenhydramine - false positive for phencyclidine (Ref: 32)
Diphenhydramine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Diphenhydramine (Benadryl) - false positive PCP results (Ref: 24)
d-Methamphetamine HCL may test positive for methamphetamine (Ref: 33)
Doco children's cough syrup - false positive for Opioids (Ref: 3)
Dolobid - false positive for THC, Marijuana (Ref: 3, 18)
Dolophine may test positive for methadone (Ref: 33)
Dolophine® contains synthetic opiates (Ref: 18)
Donnagel-PG ® contains opium/morphine (Ref: 18)
Donnatal may test positive for barbiturates (Ref: 33)
Donnatal® contains barbiturates (Ref: 18)
Donnatol (for irritable bowel syndrome) - false positive for barbiturates (Ref: 3)
Dormonocet® contains benzodiazepines (Ref: 18)
Doxepin - false positive for LSD (Ref: 47)
Doxepin may test positive for Tricyclic Antidepressants (Ref: 33)
Doxylamine - false positive for phencyclidine (Ref: 32)
Dristan Cold caplets - false positive for Amphetamines (Ref: 3)
Dristan Cough Formula - false positive for Heroin, Opiates, Morphine (Ref: 1, 18)
Dristan Nasal Spray - false positive for Amphetamines (Ref: 26, 29)
Drixoral Cold and Flu - false positive for Amphetamines (Ref: 3, 18)
Dronabad® (Ref: 18)
Dronabinol (Marinol) - false positives for THC (Ref: 16, 18)
Duramorph - positive for opiates (Ref: 33)
Duramorph® contains morphine (Ref: 18)
Durophet® Amphetamines (Ref: 18)
E (slang) may test positive for methamphetamine and ecstasy (Ref: 33)
Ecstasy (slang) may test positive for methamphetamine and ecstasy (Ref: 33)
Edecrin - false positive for THC, Marijuana (Ref: 3, 18)
Efavirenz - false positive for THC, Marijuana (Ref: 32)
Efavirenz may test positive for THC (Ref: 33)
Effexor Tablets (venlafaxine hydrochloride) - false positive for PCP (Ref: 27)
Efidac/24 - false positive for Amphetamines (Ref: 3, 18)
Efotamine - false positive for LSD (Ref: 3)
Elavil - false positives for opiates for up to three days, LSD, Methadone (Ref: 3, 26, 29, 43)
Eldepryl - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Elderpryl® metabolizes to methamphetamine and amphetamine (Ref: 18)
Empirin w/codeine - false positive for Morphine, Opioids (Ref: 1, 3, 20)
Emprin with Codeine® (Ref: 18)
Enoxacin - false-positive for opiates (Ref: 25, 28)
Entersan may test positive for opiates (Ref: 33)
Ephedra - false positives for Amphetamines and Ecstasy (Ref: 20, 22)
Ephedrine - false positive for Amphetamines, Meth, and Ecstasy (Ref: 2, 3, 11, 16, 18, 29, 30, 32)
Ephedrine-based compounds - false positives for Amphetamines and Ecstasy (Ref: 20, 22)
Ephedrol, Ephedra (Ma Haung) - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Ergostat® - false positive for LSD (Ref: 3, 18)
Ergotamine (Ref: 18)
Estasule Minus - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Estazolam may test positive for Benzodiazepines (Ref: 33)
Etafediabe - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16)
Ethylamphetamine metabolizes to amphetamine (Ref: 18)
Ethylmorphine may test positive for opiates (Ref: 33)
Eve (slang) may test positive for amphetamines (Ref: 33)
Excedrin IB - false positives for Marijuana (Cannabis) THC (Ref: 3, 16, 18)
Famprofazone - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Feldene - false positives for THC (Ref: 3, 18)
Fencamine metabolizes to methamphetamine and amphetamine (Ref: 18)
Fenelylline - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Fenfluramine - false positive for Ecstasy (Ref: 3, 11)
Fenoprofin - false positive for Marijuana, Amphetamines, Barbiturates (Ref: 1, 7)
Fenproporex metabolizes to amphetamine (Ref: 18)
Fenproyorex - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Fentanyl - false positive for LSD (Ref: 47)
Finedal® metabolizes to amphetamine (Ref: 18)
Fioricet may test positive for Barbiturates (Ref: 33)
Fioricet with Codeine® (Ref: 18)
Fiorinal may test positive for Barbiturates (Ref: 33)
Fiorinal w/codeine - false positive for Morphine (Ref: 1, 3, 18, 20)
Flunitrazepam may test positive for Benzodiazepines (Ref: 33)
Fluoroquinolone antibiotics - false positive for opiates (Ref: 28, 32)
Fluoxetine (Prozac) - false positives for amphetamines and LSD (Ref: 31, 47)
Flurazepam contains benzodiazepines (Ref: 18)
Flurbiprofen - false positive for marijuana (Ref: 3)
Fluriprofen® (Ref: 18)
Fluspirilene may test positive for amphetamines (Ref: 26)
Frisium may test positive for Benzodiazepines (Ref: 33)
Furfenorex metabolizes to methamphetamine and amphetamine (Ref: 18)
Galcodine may test positive for opiates (Ref: 33)
Galenphol may test positive for opiates (Ref: 33)
Gamanil may test positive for Tricyclic Antidepressants (Ref: 33)
Gatifloxacin (Ref: 25)
Genpril - false positive for THC, Marijuana (Ref: 3, 18)
Gradumet® contains d-methamphetamine (Ref: 18)
Haloperidol - false positive for LSD (Ref: 47)
Halotest-25 (Ref: 40)
Haltran - false positive for THC, Marijuana (Ref: 3, 18)
Hamantashen may test positive for opiates. (Ref: 13)
Hempseed Oil - false positive for THC (Ref: 3, 16, 21, 29)
Hold Cough Suppressant - false positive for Heroin, Opiates, Morphine (Ref: 1)
Homatropine Methylbromide contains synthetic opiates (Ref: 18)
Hycodan® contains synthetic opiates (Ref: 18)
Hydergine - false positive for LSD (Ref: 3)
Hydrocodone - false positive for oxycodone (Ref: 41)
Hydrocodone Bitartrate contains synthetic opiates (Ref: 18)
Hydrocodone contains synthetic opiates (Ref: 18)
Hydrocodone may test positive for opiates (Ref: 33)
Hydromorphone contains synthetic opiates (Ref: 18)
Hydromorphone may test positive for opiates (Ref: 33)
Hydrostat may test positive for opiates (Ref: 33)
Hydroymethamphetamone - false positive for Amphetamines (Ref: 3)
Ibuprin - false positive for marijuana (Ref: 3)
Ibuprofen - false positive for Marijuana (THC) (Ref: 1, 3, 16, 18, 29, 48)
Ifenoprofen - false positive for THC, Marijuana (Ref: 3, 13, 18, 21, 26)
Imitrex Hydergine® (Ref: 3, 18)
Indocin - false positive for THC, Marijuana (Ref: 3, 18)
Infantol Pink ® contains opium/morphine (Ref: 18)
Infumorf contains morphine (Ref: 18)
Isoclor Expectorant contains codeine (Ref: 18)
Kaoden with Codeine® (Ref: 18)
Kaodene with Paregoric® contains opium/morphine (Ref: 18)
Kapake - positive for opiates (Ref: 33)
Kapake may test positive for opiates (Ref: 33)
Kenesed® contains barbiturates (Ref: 18)
Ketamine - false positive for PCP (Ref: 16, 32)
Ketoprofen - false positive for THC (Ref: 3, 16, 18)
Kidney disease - false positive for Cocaine (Ref: 3, 16, 20)
Kidney infection - false positive for Amphetamines, THC, Ecstasy, and Opiates (Ref: 3, 15, 16, 21)
Klonopin may test positive for Benzodiazepines (Ref: 33)
Klonopin® contains benzodiazepines (Ref: 18)
Koalin and Morphine Mixture may test positive for opiates (Ref: 33)
Labetolol - false positive for LSD (Ref: 47)
Lerisum may test positive for Benzodiazepines (Ref: 33)
Ketipinor (quetiapine) - false-positives for amphetamines (Ref: 48)
Levaquin® - false positive for opiates (Ref: 35)
Levofloxacin (antibiotic) - false positives for opiates (Ref: 25, 28)
Lexotan may test positive for benzodiazepines (Ref: 33)
Libritab® contains benzodiazepines (Ref: 18)
Librium may test positive for Benzodiazepines (Ref: 33)
Librium® contains benzodiazepines (Ref: 18)
Limbitrol® contains benzodiazepines (Ref: 18)
Lisuride - false positive for LSD (Ref: 3)
Lisuride/Dopergin® (Ref: 18)
Liver Disease - false positive for Opiates, Ecstasy, THC and Amphetamines (Ref: 3, 15, 16, 20, 21)
l-Methamphetamine HCL may test positive for methamphetamine (Ref: 33)
Lodine - false positive for THC, Marijuana (Ref: 3, 18, 20)
Lofepramine may test positive for Tricyclic Antidepressants (Ref: 33)
Lomefloxacin (Ref: 25)
Lomont may test positive for Tricyclic Antidepressants (Ref: 33)
Loprazolam contains benzodiazepines (Ref: 18)
Loratab may test positive for opiates (Ref: 33)
Lorazepam contains benzodiazepines (Ref: 18)
Lorazepam may test positive for Benzodiazepines (Ref: 33)
Lorcet may test positive for opiates (Ref: 33)
Lormetazepam may test positive for Benzodiazepines (Ref: 33)
Lortab - an opioid analgesic (PDR*)
Love Drug (slang) may test positive for amphetamines (Ref: 33)
Luminal may test positive for barbiturates (Ref: 33)
Luminal® contains barbiturates (Ref: 18)
Lysergol - false positive for LSD (Ref: 3, 18)
Ma Huang (Ephedra sinica) - false positives for Amphetamines and Ecstasy (Ref: 20, 32)
Marax - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Margestic - false positive for Opioids (Ref: 3)
Marinol® false positive for Marijuana (THC) (Ref: 3, 18)
Maximum Strength Sine-aid - false positive for Amphetamines (Ref: 3)
Maximum Strength Sinus Gelcaps (Ref: 18)
Maximum Strength Sudafed Sinus - false positive for Amphetamines (Ref: 3)
Maximum Strength Tylenol Sinus gelcaps - false positive for Amphetamines (Ref: 3, 18)
may test Positive for Opiates (Ref: 33)
Meclomen - false positive for THC, Marijuana (Ref: 3, 18)
Medacepan may test positive for Benzodiazepines (Ref: 33)
Medazepam may test positive for Benzodiazepines (Ref: 33)
Medipren - false positive for THC, Marijuana (Ref: 3, 18)
Mediprim - false positive for marijuana (Ref: 3)
Mefenorex - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Menstrual cramp medications like Midol and Trendar (Ref: 26)
Meperidine - false positive for phencyclidine (Ref: 32)
Mephentermine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Mesocarb - false positive for Meth and Ecstasy (Ref: 3, 11, 16, 18)
Methadone contains synthetic opiates (Ref: 18)
Methadone Hydrochloride may test positive for methadone (Ref: 33)
Methadose may test positive for methadone (Ref: 33)
Methamprex may test positive for methamphetamine (Ref: 33)
Methedrine may test positive for methamphetamine (Ref: 33)
Methoxyphenamine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Methphenidate - false positive for Amphetamines and Ecstasy (Ref: 11)
Methylenedioxyamphetamine (MDA) may test positive for amphetamines (Ref: 33)
Methylenedioxymethamphetamine (MDMA) may test positive for methamphetamine and ecstasy (Ref: 33)
Methylphenidate (Ritalin) an Amphetamine-like stimulant (Ref: 3, 32)
Methysergide/Sansert® (Ref: 18)
Methysergiside - false positive for LSD (Ref: 3)
Metoclopramide - false positive for LSD (Ref: 47)
Midol - false positive for THC, Marijuana (Ref: 3, 18, 26, 29)
Migraleve may test positive for opiates (Ref: 33)
Mini-thins - false positives for Amphetamines and Ecstasy (Ref: 20)
Miracle herb pills (Chinese herb) contain benzodiazepines (Ref: 32)
Mogadon may test positive for benzodiazepines (Ref: 33)
Morax - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Morazone - false positive for Meth and Ecstasy (Ref: 3, 11, 16)
Morcap - positive for opiates (Ref: 33)
Morphine Sulfate - positive for opiates (Ref: 33)
Motrin - false positive for THC, Marijuana (Ref: 1, 3, 16, 18, 20, 26, 29)
Moxifloxacin (Ref: 25)
MS Contin - positive for opiates (Ref: 33)
MS Contin Tablets® contain morphine (Ref: 18)
MSIR® contains morphine (Ref: 18)
Mudrane GC® contains barbiturates (Ref: 18)
Naldecon - false positive for Morphine (Ref: 1)
Nalfon - false positive for Marijuana, Amphetamines, Barbituates, Benzodiazephines, Methaqualone (Ref: 1, 3, 7, 18)
Naprosyn - false positive for THC, Marijuana (Ref: 1, 3, 18)
Naproxen (Aleve) - false positive for THC, Marijuana (Ref: 1, 3, 16, 21)
Naproxyn (Ref: 26)
Nasal sprays (Vicks inhaler, Afrin) - false positive for Amphetamines and Ecstasy (Ref: 2, 10, 16, 21)
Navonaprox - false positive for THC, Marijuana (Ref: 1)
Nembutal may test positive for barbiturates (Ref: 33)
Nembutal Sodium contains barbiturates (Ref: 18)
Neosynephren - false positive reading for Amphetamines (Ref: 26, 29)
Neosynephrine - False positive for Amphetamines (Ref: 3, 18, 26)
Nitrazepam may test positive for benzodiazepines (Ref: 33)
No Drowsiness Sinarest Tablets (Ref: 3, 18)
Nobritol may test positive for Benzodiazepines (Ref: 33)
Nobrium may test positive for Benzodiazepines (Ref: 33)
Noctamide may test positive for Benzodiazepines (Ref: 33)
Nonprescription products that contain opium (i.e., morphine) (Ref: 18)
Norcyclobenzaprine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Norflex - false positive for Morphine (Ref: 43)
Norfloxacin (Ref: 25)
Novahistine DH® contains codeine (Ref: 18)
Novahistine Expectorant® contains codeine (Ref: 18)
NSAIDS - false positive for THC, Marijuana (Ref: 3, 18, 20, 32) (Ref. 22 says NO)
Nucofed Expectorant contains codeine (Ref: 18)
Numorphan® contains synthetic opiates (Ref: 18)
Nuprin - false positive for THC (Ref: 3, 16, 18, 20, 26, 29)
Nyquil - false positive for Amphetamines, Heroin, Opiates, Morphine, Meth, Ecstasy, Methadone (Ref: 1, 3, 11, 14, 16, 18, 19, 20, 26, 29, 43)
Obetrol® Amphetamines (Ref: 18)
Ofloxacin (antibiotic) - false positives for opiates (Ref: 25, 28)
Opazimes may test positive for opiates (Ref: 33)
Oramorph - positive for opiates (Ref: 33)
Oramorph contains morphine (Ref: 18)
Ornade - false positive for Amphetamines (Ref: 3, 18)
Ortain - false positive for Amphetamines (Ref: 2, 7, 11)
Orudis KT - false positives for THC (Ref: 3, 16, 18)
Orudis® (Ref: 3, 18)
OTC diet aids with phenylpropanolamine (Dexatrim, Accutrim) (Ref: 11)
Over-the-counter nasal sprays (See Vicks inhaler, Afrin) (Ref: 11, 16, 18, 20)
Oxaprozin - false positive for THC, Marijuana, Benzodiazepines (Ref: 3, 18, 34)
Oxazepam contains benzodiazepines (Ref: 18)
Oxazepam may test positive for benzodiazepines (Ref: 33)
Ox-pam may test positive for benzodiazepines (Ref: 33)
Oxycodone - positive for Oxycodone (Ref: 33)
Oxycodone contains synthetic opiates (Ref: 18)
Oxycontin - positive for Oxycodone (Ref: 33)
Oxymorphone contains synthetic opiates (Ref: 18)
Pamprin® - false positive for THC, Marijuana (Ref: 3, 18, 20)
Pantoprazole - false positive for THC (Ref: 37)
Paracetamol (Acetaminophen)/Codeine (Ref: 33)
Paracetamol with codeine - positive for opiates (Ref: 33)
Paracodine® contains synthetic opiates (Ref: 18)
Paramol may test positive for opiates (Ref: 33)
Paregoric contains opium/morphine (Ref: 18)
Par-Glycerol-C (CV) contains codeine (Ref: 18)
Pavacol-D may test positive for opiates (Ref: 33)
Pedacare - false positive for Opioids (Ref: 3)
Pediacof® contains codeine (Ref: 18)
Pediatric may test positive for opiates (Ref: 33)
Pefloxacin - false positive for Opiates (Ref: 25, 28)
Pemoline - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Pentobarbital may test positive for barbiturates (Ref: 33)
Pentobarbital Sodium contains barbiturates (Ref: 18)
Percocet - will test positive (not false) for opiates (Ref: 3, 20)
Percodan - positive for Oxycodone (Ref: 33)
Percodan® contains synthetic opiates (Ref: 3, 18, 20)
Percovil - will test positive (not false) for opiates (Ref: 20)
Perphe****ne - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Perylamine (Ref: 26)
Phenaphen with Codeine® (Ref: 18)
Phendimetrazine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Phenegan-D - false positive for Amphetamines, Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Phenergan VC® contains codeine (Ref: 18)
Phenergan with Codeine® (Ref: 18)
Phenergan® - false positive for THC, Methadone (Ref: 3, 16, 18, 43)
Phenergan-D (Ref: 18)
Phenmetrazine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Phenobarbital contains barbiturates (Ref: 18, 20)
Phenobarbital may test positive for barbiturates (Ref: 33)
Phenobarbital may test positive for barbiturates (Ref: 33)
Phenobarbitone may test positive for barbiturates (Ref: 33)
Phentermine - false positive for Amphetamines and Ecstasy on urine tests (Ref: 3, 4, 11)
Phenylephrine - false positive for Amphetamines (Ref: 3, 18)
Phenylephrine - false positive for Amphetamines (Ref: 11)
Phenylpropanolamine - false positive for amphetamines (Ref: 3, 18, 22, 30, 32)
Phenylpropanolamine (PPA) - false positive for Meth (Ref: 11, 16)
Phenypropan-Olamine - false positive for Amphetamines (Ref: 2, 7) (This is an active ingredient in Actifed, Alka-Seltzer, Alka-Selzer Plus, Allerest, Caldecon, Contac, Dietac, Dimetapp, 4-Way Nasal Spray, Ortain, Sinarest, Triaminicin)
Phenypropanolamine - false positive reading for Amphetamines (Ref: 29)
Pholcodine may test positive for opiates (Ref: 33)
Pholedrine - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16)
Physetone may test positive for methadone (Ref: 33)
Poly-Histine contains codeine (Ref: 18)
Pondinil® metabolizes to amphetamine (Ref: 18)
Poppy Seeds contain morphine - positive for Heroin (MDMA), Opiates (Ref: 3, 16, 17, 20, 21, 25, 26, 29, 32, 48)
Potentsex pills (Chinese herb) contain benzodiazepines (Ref: 32)
Prazepam may test positive for benzodiazepines (Ref: 33)
Prenylamine metabolizes to amphetamine (Ref: 18)
Preparations - positive for opiates (Ref: 33)
Prescription medications that contain codeine (Ref: 18)
Prescription NSAIDS (Ref: 18, 20)
Prescription sleeping pills may test positive for Benzodiazepines (Ref: 3, 20)
Primatene-M (Ref: 26, 29)
Primatine Tablets - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Prochlorperazine - false positive for LSD (Ref: 47)
Promethazine - false positive for THC (Ref: 3, 16, 18)
Promethegan - false positive for THC (Ref: 3, 16, 18)
Propanolamine (Ref: 26)
Propoxyphene contains synthetic opiates (Ref: 18)
Propylephedrine - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
ProSom may test positive for Benzodiazepines (Ref: 33)
Proton pump inhibitors - false positive for THC (Ref: 37)
Protonix - false positive for THC (Ref: 37)
Prozac (Fluoxetine Hydrochloride) - false positives for amphetamines (Ref: 31)
Pseudoephederine - false positives for Amphetamines and Ecstasy (Ref: 20)
Pseudoephedrine may be detected as amphetamines (speed) (Ref: 3, 11, 18, 21, 30, 48)
Pseudoephedrine may test positive for amphetamines (Ref: 33)
Pseudoephedrineare - false positive for amphetamines (Ref: 22)
Purim cookies contain poppy seeds, false positive for opiates (Ref: 13, 16, 17)
Pylorid may test positive for methamphetamines (Ref: 33)
Quadrinal® - false positive for Amphetamines, Heroin, Opiates (Ref: 1, 18)
Quelichine - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Quelidrine - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Quetiapine (Seroquel) - false positive for amphetamines (Ref: 48)
Quibron Plus - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Quinine in Tonic water - positive for opiates (Ref: 26, 29, 32)
Quinolones (Ref: 25)
Ranitidine - false positive for Amphetamines (Ref: 32)
Ranitidine may test positive for methamphetamines (Ref: 33)
Redux - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16)
Relafen - false positive for Marijuana (Ref: 3)
Remedeine Forte may test positive for opiates (Ref: 33)
Remedeine may test positive for opiates (Ref: 33)
Remedine - positive for opiates (Ref: 33)
Rescudose contains morphine (Ref: 18)
Restoril may test positive for benzodiazepines (Ref: 33)
Rexatal® contains barbiturates (Ref: 18)
Riboflavin (vitamin B2) - false positive for THC (Ref: 3, 16, 18, 21)
Rifampicin (antibiotic) - false positive for Opioids (Ref: 3)
Rifampin - false positive for Opiates (Ref: 25, 32)
Risperidone - false positive for LSD (Ref: 47)
Ritalin® an Amphetamine-like stimulant (Ref: 18)
Rivotril may test positive for Benzodiazepines (Ref: 33)
Rivotril® contains benzodiazepines (Ref: 18)
Robitussin - positive for opiates (Ref: 20)
Robitussin A-C® contains codeine (Ref: 18)
Robitussin Cold and Flu - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Robitussin DAC® contains codeine (Ref: 18)
Robitussin DM - false positive for Heroin, Opiates, Morphine (Ref: 1)
Rohypnol may test positive for Benzodiazepines (Ref: 33)
Romilar - false positive for Heroin, Opiates, Morphine (Ref: 1)
Roxanol - positive for opiates (Ref: 33)
Roxanol contains morphine (Ref: 18)
Roxicet - positive for Oxycodone (Ref: 33)
Rufin - false positive for THC, Marijuana (Ref: 1, 3)
Secobarbital contains barbiturates (Ref: 18)
Secobarbital may test positive for barbiturates (Ref: 33)
Secobarbital Sodium Bellergal-S® contains barbiturates (Ref: 18)
Seconal may test positive for barbiturates (Ref: 33)
Seconal Sodium contains barbiturates (Ref: 18)
Selegiline (Eldepryl) - false positive for Meth, Amphetamines and Ecstasy (Ref: 3, 11, 18)
Serax may test positive for benzodiazepines (Ref: 33)
Serax® contains benzodiazepines (Ref: 18)
Seroquel (quetiapine) - false-positives for amphetamines (Ref: 48)
Sertraline - false positives for benzodiazepines and LSD (Ref: 44, 47)
Sertraline may test positive for benzodiazepines (Ref: 33)
Severedol - positive for opiates (Ref: 33)
Shampoo containing hemp (Ref: 29)
Silexin - false positive for Heroin, Opiates, Morphine (Ref: 1)
Sinarest - false positive for Amphetamines, Morphine (Ref: 1, 2, 7)
Sine-Aid Tablets Maximum Strength (Ref: 18)
Sine-Off - false positive for Morphine (Ref: 1)
Sinequan may test positive for Tricyclic Antidepressants (Ref: 33)
Sinex - false positive for Amphetamines (Ref: 3)
Sinubid - false positive for Morphine (Ref: 1)
Sinus Excedrin Extra Strength Caplets - false positive for Amphetamines (Ref: 3, 18)
Solfoton® contains barbiturates (Ref: 18)
Solpadol - positive for opiates (Ref: 33)
Solpadol may test positive for opiates (Ref: 33)
Soma - false positive for Morphine (Ref: 43)
Soma with Codeine (Ref: 18)
Somnite may test positive for benzodiazepines (Ref: 33)
Soneryl may test positive for Barbiturates (Ref: 33)
Sparfloxacin (Ref: 25)
St. Joseph's Cough Syrup - false positive for Heroin, Opiates, Morphine (Ref: 1)
Stesolid may test positive for Benzodiazepines (Ref: 33)
Strong BP may test positive for opiates (Ref: 33)
Sudafed - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16, 18, 20, 26, 29)
Sudafed may test positive for amphetamines (Ref: 33)
Sustiva (Efanirenz) - false positive for THC or Marijuana (Ref: 38)
Sustiva may test positive for THC (Ref: 33)
Synalgos DC® contains synthetic opiates (Ref: 18)
Tanning lotion containing hemp (Ref: 2)
Tavist-D - false positive for Meth and Ecstasy (Ref: 3, 11, 16, 18)
Tedral - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Tegisec® metabolizes to amphetamine (Ref: 18)
Temazepam may test positive for benzodiazepines (Ref: 33)
Thebacon may test positive for opiates (Ref: 33)
Thioridazine - false positive for phencyclidine and LSD (Ref: 32, 47)
Thioridazine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Tolectin® - false positive for THC, Marijuana (Ref: 3, 18, 20)
Tonic water - false positive for cocaine (Ref: 16, 18)
Tranxene may test positive for Benzodiazepines (Ref: 33)
Trazedone (Trazadone) (Ref: 32)
Trazodone - false positive for LSD (Ref: 47)
Trendar Cramp Relief Formula - false positive for THC, Marijuana (Ref: 3, 18, 26, 29)
Triaminic 12 - false positive for Amphetamines (Ref: 3, 18)
Triaminic Expectorant with Codeine® (Ref: 18)
Triaminicin - false positive for Amphetamines, Morphine (Ref: 1, 2, 7)
TriazolamHalcion® contains benzodiazepines (Ref: 18)
Tricyclic antidepressants may produce false-positive results for amphetamines (Ref: 48)
Trimeprazine - false positive for Tricyclic Antidepressants (TCA) - (Ref: 46)
Triminicol - false positive for Morphine (Ref: 1)
Triprolidine - false positive for LSD (Ref: 3, 18)
Trucal - false positive for Heroin, Opiates, Morphine (Ref: 1)
Tussagesic - false positive for Morphine (Ref: 1)
Tussaminic - false positive for Heroin, Opiates, Morphine (Ref: 1)
Tussar 2® contains codeine (Ref: 18)
Tussar SF® contains codeine (Ref: 18)
Tussinic - false positive for Heroin, Opiates, Morphine (Ref: 1)
Tussi-Organiden contains codeine (Ref: 18)
Tylenol (acetaminophen) with Codeine® (Ref: 3, 18, 20, 33)
Tylenol 3 - may cause positive for opiates (Ref: 20)
Tylenol 3 - positive for opiates (Ref: 33)
Tylenol 4 - may cause positive for opiates (Ref: 20)
Tylenol Cold (combination) may test positive for amphetamines (Ref: 33)
Tylenol Simply Sleeps (Diphenhydramine) - false positive PCP results (Ref: 24)
Tylenol Sinus - false positives for Amphetamines and Ecstasy (Ref: 20)
Tylenol Sinus gelcaps, Maximum Strength - false positive for Amphetamines (Ref: 3, 18)
Tylex - positive for opiates (Ref: 33)
Tylex may test positive for opiates (Ref: 33)
Unisom Nighttime Sleep Aid - false positive for Morphine (Ref: 43)
Valclair may test positive for Benzodiazepines (Ref: 33)
Valerian Root and extract - false positives for Benzodiazepines (Ref: 36)
Valium may test positive for Benzodiazepines (Ref: 33)
Valium® (Diazepam) contains benzodiazepines (Ref: 18, 20)
Valrelease® contains benzodiazepines (Ref: 18)
Venlafaxine hydrochloride (Effexor) - false positive for PCP (Ref: 27)
Verapamil - false positive for LSD (Ref: 47)
Vicks Cough Syrup - false positive for Heroin, Opiates, Morphine (Ref: 1)
Vicks Formula 44M - false positive for heroin, Methadone (Ref: 1, 14, 26, 29, 43)
Vicks Inhaler - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Vick's Inhaler may test positive for methamphetamine (Ref: 33)
Vicks Nasal Spray (Ref: 26, 29)
Vicks Nyquil - false positive for Ecstasy (MDMA), Meth (Ref: 3, 11, 16, 18)
Vicodin ES® contains synthetic opiates (Ref: 3, 18)
Vicodin may test positive for opiates (Ref: 33)
Vitamin B2 - false positive for THC (Ref: 3, 16, 18)
Voltaren - false positive for THC, Marijuana (Ref: 3, 18)
Wellbutrin - false positive for Amphetamines (Ref: 12)
Wigraine® - false positive for LSD (Ref: 3, 18)
Wygesic - will test positive (not false) for opiates (Ref: 20)
Xanax® (Niravam, Alprazolam) contains benzodiazepines (Ref: 18)
Xepin may test positive for Tricyclic Antidepressants (Ref: 33)
XTC (slang) may test positive for methamphetamine and ecstasy (Ref: 33)
Zantac - false positive for Amphetamines (Ref: 30)
Zantac may test positive for methamphetamines (Ref: 33)
Zoloft - false positive for benzodiazepines (Ref: 31)
Zoloft may test positive for benzodiazepines (Ref: 33)
Zyrtec-D contains pseudoephedrine that may cause a false positive for amphetamines (Ref: 3, 11, 18, 21, 30)