From http://www.askdocweb.com/falsepositives.html So many because you didn't say what caused the interaction

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)
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)
Alprazolam contains benzodiazepines (Ref: 18)
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)
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 - can 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)
Antibiotics - false positives for Heroin, Cocaine (Ref: 13, 18, 20)
Antrocol Elixor® contains barbiturates (Ref: 18)
Apo-Naproxen - false positive for THC, Marijuana (Ref: 1)
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® contains benzodiazepines (Ref: 18)
Atripla - false positive for cannabinoid THC (Ref: 39)
B2 vitamin - false positive for THC (Ref: 21)
Bayer Select Maximum Strenght Sinus Pain Relief Caplets - false positive for Amphetamines (Ref: 3, 18)
Bayer Select Pain Relief Formula - false positive for THC, Marijuana (Ref: 3, 18)
Bentyl® - false positive for LSD (Ref: 3, 18)
Benylin - false positive for Opioids (Ref: 3)
Benzatropine/Artane® (Ref: 18)
Benzedrine® - Amphetamines (Ref: 18)
Benzphetamine - false positives for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Biphetamine® for Amphetamines (Ref: 18)
Black Pearls (Tung Sheuh pills) contain benzodiazepines (Ref: 32)
Broncholate CS contains codeine (Ref: 18)
Bromocriptine/Parlodel® (Ref: 18)
Bromocription - false positive for LSD (Ref: 3)
Bromphenlramlne - false-Positive for Amphetamine (Ref: 22)
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)
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)
Cathne - false positives for Amphetamines, Meth and Ecstasy (MDMA) (Ref: 3, 11, 16)
Cheracol contains codeine (Ref: 18)
Cheracol Sinus - false positive for Amphetamines (Ref: 3)
Chinese herb pills contain benzodiazepines (Ref: 32)
Chlordiazepoxide contains benzodiazepines (Ref: 18)
Chiorpromazlne - False-Positive for Amphetamine (Ref: 22, 26)
Chlorpromazine - false positive for Opiates (Also false for pregnancy) (Ref: 23, 32)
Chlorpromazine - false positive for phencyclidine (Ref: 32)
Cipro (antibiotic) - false positives for opiates (Ref: 25, 32)
Clinafloxacin - (Ref: 25)
Clinoril - false positive for THC, Marijuana (Ref: 3, 18)
Clobenzorex - false positives for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Clonazepam contains benzodiazepines (Ref: 18)
Codeine - false positives for Amphetamines (Ref: 14)
Codeine - will test positive (not false) for opiates (Ref: 20)
Codinal PH® contains codeine (Ref: 18)
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)
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)
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)
Cylert - false positives for Amphetamines and Ecstasy (Ref: 3, 11)
Dalmane® contains benzodiazepines (Ref: 18)
Datril - false positives for Marijuana (Ref: 1)
Darvon® contains synthetic opiates (Ref: 18)
Daypro - false positives for benzodiazepines (Ref: 34)
Deconsal contains codeine (Ref: 18)
Demerol - tests positive for opiates (Ref: 26, 29)
Deprenyl - false positives for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Desipramine (Ref: 32)
Desoxyephedrine - false positive for Amphetamines and Ecstasy (Ref: 3, 11, 18)
Desoyn® contains d-methamphetamine (Ref: 18)
Diet aids with phenylpropanolamine (Dexatrim, Accutrim) - false positive for Amphetamines (Ref: 11, 16, 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)
Dexfenfluramine - false positive for Amphetamines (Ref: 3, 11)
Dextroamphetamine - false positive for Amphetamines (Ref: 3)
Dextromethorphan hydrobromide or DXM - false positives for amphetamines (Ref: 6, 11)
Dextromethorphan - false positive for Heroin, Opiates, Morphine (Ref: 1, 3, 16, 21, 26, 29, 32)
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)
Diazepam - false positive for PCP (Ref: 29)
Diazepam (generic name for Valium) - contains benzodiazepines (Ref: 18, 20, 26)
Dicyclomine (Ref: 18)
Didrex - false positive for Amphetamines (Ref: 3, 11)
Diet aids with phenylpropanolamine (Dexatrim, Accutrim) - false positive for amphetamines (Ref: 2, 10, 16)
Dietac - false positive for Morphine (Ref: 1, 2, 7)
Dihyrocodeine contains synthetic opiates (Ref: 18)
Dilantin - false positives for Barbiturates (Ref: 3, 20)
Dilaudid® contains synthetic opiates (Ref: 18)
Dimetane-DC Cough Syrup ® contains codeine (Ref: 18)
Dimetapp - false positive for Morphine, Meth, Ecstasy (Ref: 1, 2, 7, 11, 16, 18)
Dimethylamphetamine metabolizes to methamphetamine and amphetamine (Ref: 18)
Dietac - false positive for Amphetamines (Ref: 7)
Dimetapp - false positive for Amphetamines (Ref: 3, 7)
Dinintel® metabolizes to amphetamine (Ref: 18)
Diphenhydramine - false positive PCP results (Ref: 24)
Diphenhydramine - false positive for phencyclidine (Ref: 32)
Doco children's cough syrup - false positive for Opioids (Ref: 3)
Dolobid - false positive for THC, Marijuana (Ref: 3, 18)
Dolophine® contains synthetic opiates (Ref: 18)
Donnagel-PG ® contains opium/morphine (Ref: 18)
Donnatal® contains barbiturates (Ref: 18)
Donnatol (for irritable bowel syndrome) - false positive for barbiturates (Ref: 3)
Dormonocet® contains benzodiazepines (Ref: 18)
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® contains morphine (Ref: 18)
Durophet® Amphetamines (Ref: 18)
Edecrin - false positive for THC, Marijuana (Ref: 3, 18)
Efavirenz - false positive for THC, Marijuana (Ref: 32)
Effexor Tablets (venlafaxine hydrochloride) - false positive for PCP (Ref: 27, 33)
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 (Ref: 3, 26, 29)
Eldepryl - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Elderpryl® metabolizes to methamphetamine and amphetamine (Ref: 18)
Emprin with Codeine® (Ref: 18)
Ephedrol, Ephedra (Ma Haung) - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Ephedrine - false positive for Amphetamines, Meth, and Ecstasy (Ref: 2, 3, 11, 16, 18, 29, 30, 32)
Empirin w/codeine - false positive for Morphine, Opioids (Ref: 1, 3, 20)
Enoxacin - false-positive for opiates (Ref: 25, 28)
Ergostat® - false positive for LSD (Ref: 3, 18)
Ergotamine (Ref: 18)
Estasule Minus - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Etafediabe - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16)
Ethylamphetamine metabolizes to amphetamine (Ref: 18)
Excedrin IB - false positives for Marijuana (Cannabis) THC (Ref: 3, 16, 18)
Ephedra - false positives for Amphetamines and Ecstasy (Ref: 20, 22)
Ephedrine-based compounds - false positives for Amphetamines and Ecstasy (Ref: 20, 22)
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)
Finedal® metabolizes to amphetamine (Ref: 18)
Fioricet with Codeine® (Ref: 18, 20)
Fiorinal w/codeine - false positive for Morphine (Ref: 1, 3, 18, 20)
Fluoroquinolone antibiotics - false positive for opiates (Ref: 28, 32)
Fluoxetine (Prozac) - false positives for amphetamines (Ref: 31)
Flurazepam contains benzodiazepines (Ref: 18)
Flurbiprofen - false positive for marijuana (Ref: 3)
Fluriprofen® (Ref: 18)
Fluspirilene may test positive for amphetamines (Ref: 26)
Furfenorex metabolizes to methamphetamine and amphetamine (Ref: 18)
Gatifloxacin (Ref: 25)
Genpril - false positive for THC, Marijuana (Ref: 3, 18)
Gradumet® contains d-methamphetamine (Ref: 18)
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 Bitartrate contains synthetic opiates (Ref: 18)
Hydrocodone contains synthetic opiates (Ref: 18)
Hydrocodone - false positive for oxycodone (Ref: 41)
Hydromorphone contains synthetic opiates (Ref: 18)
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)
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)
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® contains benzodiazepines (Ref: 18)
Levaquin® - false positive for opiates (Ref: 35)
Levofloxacin (antibiotic) - false positives for opiates (Ref: 25, 28)
Libritab® contains benzodiazepines (Ref: 18)
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)
Lodine - false positive for THC, Marijuana (Ref: 3, 18, 20)
Lomefloxacin (Ref: 25)
Loprazolam contains benzodiazepines (Ref: 18)
Lorazepam contains benzodiazepines (Ref: 18)
Lortab - an opioid analgesic (PDR*)
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 Sinus Gelcaps (Ref: 18)
Maximum Strength Sine-aid - false positive for Amphetamines (Ref: 3)
Maximum Strength Sudafed Sinus - false positive for Amphetamines (Ref: 3)
Maximum Strength Tylenol Sinus gelcaps - false positive for Amphetamines (Ref: 3, 18)
Meclomen - false positive for THC, Marijuana (Ref: 3, 18)
Mediprim - false positive for marijuana (Ref: 3)
Medipren - false positive for THC, Marijuana (Ref: 3, 18)
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)
Methoxyphenamine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Methphenidate - false positive for Amphetamines and Ecstasy (Ref: 11)
Methylphenidate (Ritalin) an Amphetamine-like stimulant (Ref: 3, 32)
Methysergide/Sansert® (Ref: 18)
Methysergiside - false positive for LSD (Ref: 3)
Midol - false positive for THC, Marijuana (Ref: 3, 18, 26, 29)
Mini-thins - false positives for Amphetamines and Ecstasy (Ref: 20)
Miracle herb pills (Chinese herb) contain benzodiazepines (Ref: 32)
Morazone - false positive for Meth and Ecstasy (Ref: 3, 11, 16)
Morax - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Motrin - false positive for THC, Marijuana (Ref: 1, 3, 16, 18, 20, 26, 29)
Moxifloxacin (Ref: 25)
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 Sodium contains barbiturates (Ref: 18)
Neosynephren - false positive reading for Amphetamines (Ref: 26, 29)
Neosynephrine - False positive for Amphetamines (Ref: 3, 18, 26)
No Drowsiness Sinarest Tablets (Ref: 3, 18)
Nonprescription products that contain opium (i.e., morphine) (Ref: 18)
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 (Ref: 1, 3, 11, 14, 16, 18, 19, 20, 26, 29)
Obetrol® Amphetamines (Ref: 18)
Ofloxacin (antibiotic) - false positives for opiates (Ref: 25, 28)
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)
Oxycodone contains synthetic opiates (Ref: 18)
Oxymorphone contains synthetic opiates (Ref: 18)
Pamprin® - false positive for THC, Marijuana (Ref: 3, 18, 20)
Pantoprazole - false positive for THC (Ref: 37)
Paracodine® contains synthetic opiates (Ref: 18)
Paregoric contains opium/morphine (Ref: 18)
Par-Glycerol-C (CV) contains codeine (Ref: 18)
Pedacare - false positive for Opioids (Ref: 3)
Pediacof® contains codeine (Ref: 18)
Pefloxacin - false positive for Opiates (Ref: 25, 28)
Pemoline - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Pentobarbital Sodium contains barbiturates (Ref: 18)
Percocet - will test positive (not false) for opiates (Ref: 3, 20)
Percodan® contains synthetic opiates (Ref: 3, 18, 20)
Percovil - will test positive (not false) for opiates (Ref: 20)
Perylamine (Ref: 26)
Phenaphen with Codeine® (Ref: 18)
Phendimetrazine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Phenergan-D (Ref: 18)
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 (Ref: 3, 16, 18)
Phenobarbital contains barbiturates (Ref: 18, 20)
Phenmetrazine - false positive for Amphetamines and Ecstasy (Ref: 3, 11)
Phentermine - false positive for Amphetamines and Ecstasy on urine tests (Ref: 3, 4, 11)
Phenylephrine - false positive for Amphetamines (Ref: 3, 18)
Phenylpropanolamine - false positive for amphetamines (Ref: 3, 18, 22, 30, 32)
Phenylephrine - false positive for Amphetamines (Ref: 11)
Phenylpropanolamine (PPA) - false positive for Meth (Ref: 11, 16)
Phenypropanolamine - false positive reading for Amphetamines (Ref: 29)
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)
Pholedrine - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16)
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)
Potentsex pills (Chinese herb) contain benzodiazepines (Ref: 32)
Prenylamine metabolizes to amphetamine (Ref: 18)
Prescription medications that contain codeine (Ref: 18)
Prescription NSAIDS (Ref: 18, 20)
Prescription sleeping pills will 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)
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)
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)
Pseudoephedrineare - false positive for amphetamines (Ref: 22)
Purim cookies contain poppy seeds, false positive for opiates (Ref: 13, 16, 17)
Quadrinal® - false positive for Amphetamines, Heroin, Opiates (Ref: 1, 18)
Quelidrine - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
Quelichine - false positive for Amphetamines, Heroin, Opiates (Ref: 1)
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)
Redux - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16)
Relafen - false positive for Marijuana (Ref: 3)
Rescudose contains morphine (Ref: 18)
Rexatal® contains barbiturates (Ref: 18)
Riboflavin (vitamin B2) - false positive for THC (Ref: 3, 16, 18, 21)
Rifampin - false positive for Opiates (Ref: 25, 32)
Rifampicin (antibiotic) - false positive for Opioids (Ref: 3)
Ritalin® an Amphetamine-like stimulant (Ref: 18)
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)
Romilar - false positive for Heroin, Opiates, Morphine (Ref: 1)
Roxanol contains morphine (Ref: 18)
Rufin - false positive for THC, Marijuana (Ref: 1, 3)
Secobarbital contains barbiturates (Ref: 18)
Secobarbital Sodium Bellergal-S® contains barbiturates (Ref: 18)
Seconal Sodium contains barbiturates (Ref: 18)
Selegiline (Eldepryl) - false positive for Meth, Amphetamines and Ecstasy (Ref: 3, 11, 18)
Serax® contains benzodiazepines (Ref: 18)
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)
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)
Soma with Codeine (Ref: 18)
Sparfloxacin (Ref: 25)
St. Joseph's Cough Syrup - false positive for Heroin, Opiates, Morphine (Ref: 1)
Sudafed - false positive for Amphetamines, Meth and Ecstasy (Ref: 3, 11, 16, 18, 20, 26, 29)
Sustiva (Efanirenz) - false positive for THC or Marijuana (Ref: 38)
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)
Thioridazine - false positive for phencyclidine (Ref: 32)
Tolectin® - false positive for THC, Marijuana (Ref: 3, 18, 20)
Tonic water - false positive for cocaine (Ref: 16, 18)
Trazedone (Ref: 32)
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)
TriazolamHalcion® contains benzodiazepines (Ref: 18)
Triaminicin - false positive for Amphetamines, Morphine (Ref: 1, 2, 7)
Triminicol - false positive for Morphine
Triprolidine - false positive for LSD
Trucal - false positive for Heroin, Opiates, Morphine
Tussagesic - false positive for Morphine
Tussaminic - false positive for Heroin, Opiates, Morphine
Tussar 2 contains codeine
Tussar SF contains codeine
Tussi-Organiden contains codeine
Tussinic - false positive for Heroin, Opiates, Morphine
Tylenol (acetaminophen) with Codeine
Tylenol 3 - can cause positive for opiates
Tylenol 4 - can cause positive for opiates
Tylenol Sinus gelcaps, Maximum Strength - false positive for Amphetamines
Tylenol Sinus - false positives for Amphetamines and Ecstasy
Valerian Root and extract - false positives for Benzodiazepines
Valium contains benzodiazepines
Valrelease contains benzodiazepines
Venlafaxine hydrochloride (Effexor) - false positive for PCP
Vicks Formula 44M - false positive for heroin
Vicks Cough Syrup - false positive for Heroin, Opiates, Morphine
Vicks Inhaler - false positive for Ecstasy (MDMA), Meth
Vicks Nasal Spray
Vicks Nyquil - false positive for Ecstasy (MDMA), Meth
Vicodin ES® contains synthetic opiates
Vitamin B2 - false positive for THC
Voltaren - false positive for THC, Marijuana
Wellbutrin - false positive for Amphetamines
Wigraine® - false positive for LSD
Wygesic - will test positive (not false) for opiates
Xanax® contains benzodiazepines
Zantac - false positive for Amphetamines
Zoloft - false positive for benzodiazepines

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