Welcome to MedlinePlus
MedlinePlus is an online health information resource for patients and their families and friends. It is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH). Learn more about MedlinePlus
- FEATURED TOPIC
- Drug Use and Addiction
- Drugs include prescription and over-the-counter medicines, alcohol, tobacco, and illegal substances. Repeated drug use can change the brain and lead to addiction.
- Learn more