TOXICOLOGY LABORATORY TECHNICAL BRIEF by Dr. Joseph Graas, Ph.D.

The following list of drugs that could affect a drug test is for informational purposes only.

Drug Name	Immunoassay Testing	Confirmation Testing
Acetaminophen w/Codeine	Opiates Class	Codeine/Morphine *Message: Codeine > Morphine
Adderall	Amphetamines Class	Amphetamine Only
Alprenolol	None	None
Amytal	Barbiturates Class	Amobarbital
Bromazepam	Benzodiazepines Class	None
Buprenorphine	Buprenorphine Class	Buprenorphine
Butisol	Barbiturates Class	Butalbital
Celebrex	None	None
Claritin	None	None
Clonazepam	Benzodiazepines Class	Clonazepam
Dalmane	Benzodiazepines Class	Desalkylflurazepam
Darvocet	Propoxyphene Class	Propoxyphene
Depakine	None	None
Desoxyn	Amphetamines Class	Methamphetamine
Dormisan	Barbiturates Class	None
Effexor	None	None
Elixir	Barbiturates Class	Phenobarbital
Fentanyl	Fentanyl Class	Fentanyl
Fioricet w/Codeine	Barbiturates Class and Opiates Class	Butalbital Codeine/Morphine *Message: Codeine > Morphine
Floxin	None	None
Gabapentin	None	None
Hydralazine	None	None
Indocin	None	None
Jantoven	None	None
Kadian	Opiates Class	Morphine
Ketamine	None	None
Lamotrigine	None	None
Lorazepam	Negative	Lorazepam
Marinol	THC	THC
Masmoran	None	None
Maxeran	None	None
Nembutal	Barbiturates Class	Pentobarbital
Norflex	None	None
Nortriptyline	None	None
Nyazin	None	None
Octamide	None	None
Ofloxacin	None	None
Opana	Oxycodone Class	Oxymorphone
Oxycontin	Oxycodone Class	Oxycodone / Oxymorphone
Panadol	None	None
Paroxetine	None	None
Percocet	Oxycodone Class	Oxycodone / Oxymorphone
Procaine	None	None
Prosed	None	None
Pseudoephedrine	Amphetamines Class ***High Amounts Needed	None
Pyridium	None	None
Quinatime	None	None
Resertia	None	None
Restoril	Benzodiazepines Class	Temazepam, Oxazepam
Rhumalgan	None	None
Ritalin	Amphetamines Class	None
Robitussin	None	None
Rohypnol	Benzodiazepines Class	None
Septra	None	None
Serax	Benzodiazepines Class	Oxazepam
Seretide	None	None
Seroquel	None	None
Tebamide	None	None
Tensopril	None	None
Teramine	None	None
Thiothixene	None	None
Tranquizine	None	None
Tylenol	None	None
Tylenol w/Codeine Tylenol 1, 2, 3, 4	Opiates Class	Codeine/Morphine *Message: Codeine > Morphine
Urabeth	None	None
Urea	None	None
Uristat	None	None
Valergen	None	None
Valium	Benzodiazepines Class	Nordiazepam, Temazepam, Oxazepam
Valmid	None	None
Velosef	None	None
Vermox	None	None
Versed	Benzodiazepines Class	None
Vicks Inhaler	*Amphetamines Class *EXTREMELY High Amounts Needed	l-Methamphetamine/ l-Amphetamine *GCMS ONLY*
Vicodin	Opiates Class	Hydrocodone / Hydromorphone Large amts of Hydrocodone needed to have Hydromorphone
Warfarin	None	None
Wellbutrin	None	None
Xanax	Benzodiazepines Class	Alprazolam
Zarontin	None	None
Zestril	None	None
Zocor	None	None
Zyban	None	None
Zyrtec	None	None

This information provided is intended to aid the clinician with information of drugs that could affect a drug test. New drugs are constantly being prepared, prescribed, or abused by means of taking more then the recommended amount. This can alter how samples react while being tested.