Guide

Questions to ask before you join a study

Last reviewed 28 October 2026 · Editorial policy

The study team expects questions, and good studies welcome them. Here are the ones worth asking before you sign anything, grouped by topic. You can also build a printable checklist.

About the study

  • What is the study trying to find out?
  • Which phase is it, and what's known about the treatment so far?
  • Who is running and paying for the study?
  • Has it been approved by an Institutional Review Board (IRB)?

What's involved

  • How long will I be in the study?
  • How many visits are there, how long is each one, and where are they?
  • Which tests and procedures will I have?
  • Could I get a placebo instead of the treatment?

Risks and benefits

  • What are the possible side effects and risks?
  • Could I benefit from taking part?
  • What other treatment options do I have?
  • What happens if I'm harmed during the study?

Costs and payment

Your care and rights

  • Can I keep seeing my own doctor?
  • Who do I call if I have a problem, day or night?
  • What happens if I want to leave?
  • Will I find out the results when the study ends?
  • Can I keep taking the treatment after the study if it works for me?

Read more: Informed consent and your rights ยท What happens at a screening visit

See studies recruiting near you โ†’

Sources