Good reasons to write
- You've spotted an error or an outdated figure
- Something in the calculator is confusing or broken
- You work in sexual health and have suggestions
We can't give personal medical advice. For questions about your own situation, talk to a doctor, a sexual health clinic, or a local HIV service. They can test you and, if needed, start PEP the same day.
Need help now?
- Possible exposure in the last 72 hours: go to an emergency department or urgent care and ask about PEP.
- Find free testing in the US: gettested.cdc.gov
- Elsewhere: your national health service or a local sexual health charity.