Clinical Trials vs. Compassionate Use: What's the Difference?
When your insurance denies a medication and your doctor is recommending a treatment that's either very expensive or not yet widely available, you may come across two terms that sound similar but work very differently: clinical trials and compassionate use (also called expanded access).
Both can be a path to accessing medication you can't get through insurance. But they have different requirements, different processes, and different things they can offer you. Here's what you need to know.
What Is a Clinical Trial?
A clinical trial is a research study designed to test whether a treatment is safe, effective, or better than existing options. Trials go through an organized research process with a defined protocol — meaning there are specific rules about who can enroll, what treatment they receive, how they're monitored, and what data is collected.
Trials are conducted at approved sites (hospitals, clinics, research centers), reviewed by Institutional Review Boards (IRBs) that protect participant safety, and registered with ClinicalTrials.gov. The medication studied is provided free to participants, and often related tests and monitoring are also covered by the study sponsor.
In a clinical trial, you're contributing to research. Your participation helps determine whether a treatment works and is safe for a broader population.
What Is Compassionate Use (Expanded Access)?
Compassionate use — formally called expanded access — is a separate pathway that allows seriously ill patients to access experimental drugs outside of a clinical trial when no comparable alternative is available. It's regulated by the FDA. (Source: FDA.gov on Expanded Access)
This pathway is designed for situations where:
- You have a serious or life-threatening condition
- You've tried available treatments and they haven't worked
- A clinical trial isn't available or you don't qualify for one
- The potential benefit outweighs the risk
With compassionate use, your doctor applies directly to the FDA and to the drug manufacturer. The manufacturer has to agree to provide the drug (they're not required to), the FDA must approve the request, and your own doctor administers the treatment as part of your regular care — not a formal research study.
How They're Different: A Side-by-Side View
Who decides if you can access the drug?
In a clinical trial, the research team determines eligibility based on scientific criteria. In compassionate use, your doctor applies to the FDA and the manufacturer makes the final call.
Is there a research protocol involved?
Clinical trials follow a strict research protocol — you may be randomized to receive the study drug or a comparison treatment. Compassionate use is purely about treatment; there's no protocol, no randomization, and no study design.
What does it cost?
In a clinical trial, the study drug and related procedures are free to participants. In compassionate use, the manufacturer may or may not charge for the drug — some provide it free, others charge. The FDA doesn't set prices for expanded access.
Is it part of research?
Clinical trials generate data that may eventually lead to FDA approval or a label expansion. Compassionate use data is not collected in the same systematic way and doesn't directly contribute to formal research.
How widely available is it?
Clinical trials are structured and have defined enrollment slots. Compassionate use is case-by-case and depends heavily on the manufacturer's willingness to participate.
Which One Might Be Right for You?
There's no single answer — it depends on your situation, your diagnosis, and what options exist for your condition.
A clinical trial may be the right fit if:- You meet the eligibility criteria for a currently enrolling study
- You're open to a research context and possibly being randomized between treatment arms
- The trial is studying a drug or approach that's relevant to your condition
Compassionate use may be worth exploring if:- You don't qualify for available trials
- The drug you need is experimental but not yet in a trial you can access
- Your doctor is willing to navigate the FDA application process with you
In either case, the first step is a conversation with your doctor. They can evaluate both pathways given your specific medical history and what's actually available right now.
How Insurance Fits In
Neither clinical trials nor compassionate use automatically makes your insurance company responsible for coverage. In clinical trials, the sponsor covers research costs. In compassionate use, coverage can be murky — and this is where working with a knowledgeable navigator matters.
If your insurance denied a medication and you're exploring these alternatives, you can pursue both paths simultaneously. You can file an appeal while also exploring trial eligibility or asking your doctor about expanded access. These aren't either/or decisions — they're parallel tracks.
Frequently Asked Questions
Is compassionate use the same as a "right to try" request?No, though they're related. Right to Try is a federal law (passed in 2018) that allows certain patients with life-threatening illnesses to access drugs that have completed Phase I trials but aren't yet FDA-approved, without going through the FDA's expanded access process. Expanded access (compassionate use) involves the FDA; Right to Try bypasses that FDA review step. Both still require manufacturer agreement. (Source: FDA.gov on Right to Try)
Can I apply for compassionate use on my own?Not exactly. The formal request goes through your physician, who applies to the FDA and the manufacturer. Some manufacturers have simplified this process with online portals. The FDA has also worked to streamline emergency expanded access requests to as little as a few hours in some cases. Your doctor needs to be willing to lead this effort.
What happens if neither a trial nor compassionate use is available?You're not out of options. Appealing your insurance denial is still a viable path, and patient assistance programs from manufacturers may provide the drug at low or no cost to eligible individuals. Ellen can help you explore all of your options, not just one.
Does a prior clinical trial disqualify me from compassionate use, or vice versa?Generally, no — but it depends on the specific trial or expanded access program's criteria. Some trials exclude people who have received the experimental drug through expanded access, and some expanded access programs require that you not be enrolled in a trial for the same drug. Always disclose your full treatment history to both the trial team and your doctor when exploring these options.
Talk to your doctor before making any decisions about your treatment.
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