Disclaimer

We collect and compare information from public, cited sources. We cannot guarantee that it is complete, current or correct. This is not medical advice. Only a doctor can prescribe, and a doctor should confirm anything you read here before you act on it.

All we do is find, cite and compare publicly available information. We are not doctors and we do not give medical opinions. This text appears, word for word, under the byline of every page and in the site footer. Where space is short we use this short form, linked to this page: "Based on public sources; we cannot guarantee it is correct. Not medical advice. A doctor should prescribe and confirm."

What that means in practice

• Nothing on this site is a recommendation to use, buy or stop using any substance.
• Status and evidence can change after the date shown on a page. Every page shows the date its sources were last checked.
• We never claim a page has been reviewed by a clinician, because none is.

How we choose and check sources is set out in How we source. If you think something here is wrong, tell us.

If you need help now

US emergency: call 911. Poison Control: 1-800-222-1222. Mental health or crisis: call or text 988. More on when to get care.