Every medication, device, and treatment your doctor prescribes today existed first as an idea — and then as a clinical trial. Clinical research is the careful, regulated process that moves a promising idea from the laboratory to your medicine cabinet, your operating room, or your physical therapy plan.
If a clinical trial has been mentioned as an option for you or a loved one, you probably have questions. This guide walks through the basics in plain language.
What Is a Clinical Trial?
A clinical trial is a research study that evaluates an investigational treatment — often a drug, device, or procedure — in human volunteers under carefully controlled conditions. Trials are designed to answer specific scientific questions about safety and effectiveness.
Every trial follows a detailed plan called a protocol, which describes who can participate, what the participant will do, what data will be collected, and how participant safety will be monitored.
The Phases of a Clinical Trial
Drug and device trials generally proceed through a sequence of phases. Each phase builds on the previous one.
- Phase 1: First-in-human studies focused on safety, in a small group of volunteers.
- Phase 2: Tests whether the treatment works as intended and identifies common side effects.
- Phase 3: Large, often multicenter studies that confirm effectiveness and watch for less common side effects.
- Phase 4: Conducted after FDA approval to monitor long-term safety and real-world performance.
How Are Participants Protected?
Clinical trials in the United States are governed by a layered system of protections that includes:
- Institutional Review Boards (IRBs) that review and approve every study
- FDA oversight of investigational drugs and devices
- Good Clinical Practice (GCP) international standards
- Informed consent — a detailed conversation and document explaining the study before you decide
- Ongoing safety monitoring throughout the study
You can withdraw from a clinical trial at any time, for any reason, without affecting your regular medical care.
What Should You Expect as a Participant?
While every protocol is different, a typical experience may include:
- A pre-screening visit and detailed informed consent conversation
- Health assessments and imaging or labs
- Receiving the investigational treatment or, in some studies, a placebo
- Scheduled follow-up visits
- Symptom diaries or questionnaires
Many study-related visits, evaluations, and treatments are provided at no cost to participants. Some studies offer compensation for time and travel.
Common Questions
Will I receive a placebo? Some studies include a placebo group; the informed consent will explain how this works for the specific study.
Will my regular doctor know? Yes — we encourage coordination with your treating physicians, and our team is happy to communicate with them.
Is my information private? Yes. Strict privacy rules govern research data, and your identity is protected.
How to Learn More
Horizon Clinical Research conducts orthopedic and musculoskeletal studies in San Diego. If you'd like to know whether one of our current studies may be a fit, our team can walk you through what's involved.