Medical disclaimer

HalfLifeDB is an educational website. It provides simplified visualizations of pharmacokinetic concepts, including first-order elimination curves based on published half-life estimates.

No medical or treatment advice

HalfLifeDB does not provide medical advice, diagnosis, or treatment. Nothing on this site is a substitute for professional care from a licensed clinician. Do not use this site to make decisions about medications, substance use, driving, working, surgery, pregnancy, or any other health-related matter.

Model limitations

The calculators on this site use a one-compartment, first-order model. Real pharmacokinetics can involve multiple compartments, active metabolites, non-linear elimination, formulation differences, and large person-to-person variability. The values shown are approximate and can differ from real measurements.

No legal or forensic guidance

HalfLifeDB does not provide legal guidance. It does not predict any laboratory or forensic outcome. If you have a legal or occupational question, consult an appropriate professional.

Emergency situations

If you think you are experiencing a medical emergency, call your local emergency number immediately. In the United States, you can also contact the Poison Control hotline at 1-800-222-1222.

Substance use support

If you want help with substance use, support is available. In the United States, the SAMHSA National Helpline is 1-800-662-HELP (4357).