Over-the-Counter and Prescription Drugs which could alter or affect drug test results*

Category Examples
Alcohol All liquid medications containing ethyl alcohol (ethanol). Please read the label for alcohol content. As an example, Vick’s Nyquil is 25% (50 proof) ethyl alcohol, Comtrex is 20% (40 proof), Contact Severe Cold Formula Night Strength is 25% (50 proof) and Listerine is 26.9% (54 proof)
Amphetamines Obetrol, Biphetamine, Desoxyn, Dexedrine, Didrex, Ionamine, Fastine
Cannabinoids Marinol (Dronabinol, THC)
Cocaine Cocaine HCI topical solution (Roxanne)
Phencyclidine Not legal by prescription
Methaqualone Not legal by prescription
Opiates Paregoric, Parepectolin, Donnagel PG, Morphine, Tylenol with Codeine, Emprin with Codeine, APAP with Codeine, Aspirin with Codeine, Robitussin AC, Guiatuss AC, Novahistine DH, Novahistine Expectorant, dilaudid (Hydromorphine), M-S Contin and Roxanol (morphine sulfate), Percodan, Vicodin, Tussi-organidin, etc.
Barbituates Phenobarbitol, Tuinal, Amytal, Nembutal, Seconal, Lotusate, Fiorinal, Fioricet, Esgic, Butisol, Mebral, Butabarbital, Butalbital, Phenrinin, Triad, etc.
Benzodiazepines Ativan, Azene, Clonopin, dalmine, Diazepam, Librium, Xanax, Serax, Tranxene, Valium, Verstran, Halcion, Paxipam, Restoril, Centrax
Methadone Dolphine, Metadose
Propoxyphene Darvocet, Darvon N, Dolene, etc.

*Due to the large number of obscure brand names and constant marketing of new products, this list cannot and is not intended to be all-inclusive.