Explore clear, evidence-informed overviews of substances covered in our legacy drug information library. Each page explains what the substance is, summarizes recognized health risks, and points to trusted resources. This section is educational; it is not medical, legal, or treatment advice.
Browse substance guides
- Cannabis (Marijuana)
- Methamphetamine
- Cocaine
- Heroin
- MDMA (Ecstasy)
- Amphetamines
- Inhalants
- Anabolic Steroids
- Tobacco and Nicotine
- Alcohol
- LSD
- Flunitrazepam (Rohypnol)
- Ketamine
- GHB
Drug testing information
Screening products differ in specimen type and in the substances listed on their panels. Review each product’s current panel and instructions; a negative screen does not rule out every substance. The drug testing methods guide explains the main specimen types. If a home screen is positive, read what to do with an unexpected or preliminary positive result. FDA guidance describes home drug screens as preliminary and recommends follow-up laboratory testing for positive results.
Check the product page and included instructions to confirm the specific substances and specimen type covered. These screening products are not a diagnosis or a substitute for laboratory confirmation or professional advice.
Trusted sources and support
For current general information, see the National Institute on Drug Abuse’s Commonly Abused Drugs chart. For confidential treatment referrals in the United States, contact SAMHSA’s National Helpline at 1-800-662-HELP (4357). If someone may be experiencing an overdose or other medical emergency, call 911.
Related pages: Resources & Support, Drug Testing FAQs, and Shop testing products.