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The recommender will need to ask the recommended person to register their details with Trials4us and provide the first and last name of the person who has recommended them (this person must already be registered with Trials4us).

Payment is non-transferable and can only be paid directly to the recommender (the individual who has selected their friend or family member to take part in a clinical trial).

Blood donations do not qualify as a clinical trial.

Trials4us reserves the right to amend these Terms & Conditions at any time.



By registering for a clinical trial you are not making a commitment, you are expressing an interest to find out more. We will contact you to find out a few more details about you and your health and invite you into see us.
If you are eligible to take part in a trial you will:

  • Have a complete medical check up
  • Meet other like-minded volunteers
  • Relax, study or make use of our entertainment rooms
  • Get paid for your time
View and register for our current clinical trials

Registration Process

reg interest

1) You register your interest via our online form, phone or email


2) The registration team will call you to find out more about your health

mind interest

3) You decide if you are interested


4) We invite you in for a full medical check and confirm if you are eligible to take part

date commence

5) The trial commences


6) Get paid up to £100+ per day for participation!

We do not accept registrations from third parties

Recommend a friend

You can recommend a friend to take part in a clinical trial and you could receive up to £250 once they have completed the study.

Recommend a friend for up to £250 nowTerms & conditions apply

Take a tour

Our clinical unit is in the heart of London within easy reach of mainline train stations, the London Underground and international airports.

Take a walk through our unit and get a feel for what you can expect when you do a trial with us.

See all videos

Drug trials explained

An introduction to drug trials. Are they safe and what are the side effects? Watch this video for an overview on what drug trials are all about.

Learn more about clinical trials

Learn more from our volunteers

Our volunteers have shared their experiences of participating in a clinical trial with us.

View volunteer feedback


What do I have to do?

Healthy volunteers are given the new medicine as part of the clinical trial. The clinical trial is to test:

  • How long it takes for your body to absorb and then get rid of the medicine.
  • How the medicine interacts with food and other medication.
  • How much can be taken without any undesirable side effects.

Once you have taken the study medication, blood samples are collected for analysis. Other tests may be performed such as blood pressure, temperature and heart rate measurements. These tests determine what effect the medication is having on your body. Your health is very important and you will be monitored very closely. Your full co-operation is essential for safety reasons and to ensure accurate results.

Do I have to stay in the unit during a study

The answer is usually yes! The commitments of a particular trial will be explained to you before you are asked to give written consent to participate. Normally, we require all volunteers to stay in the unit for the duration of the clinical trial to make sure you have the best possible medical supervision whilst taking part. Sometimes we will ask you to refrain from smoking or drinking alcohol for example, and by asking you to remain in the unit we can make sure these requirements are complied with.

Will I be paid for taking part?

Again, the answer is yes! Up to £120 per 24 hours you spend with us. The payment is proportional to the time you spend on a study, so for example, you will be paid a lot more if you take part in a 2-week study with lots of extra visits than if you take part in a single overnight study. This will be paid to you 21 days after a follow-up visit.

Will I have to give blood during the study?

Yes! Every study will require some amount of blood and urine sampling. This is to ensure your liver and kidneys are functioning properly both before you take part, and during a study and sometimes to measure the medicine concentration in your blood to see how your body breaks it down.

Can I take part if I am on medications from my doctor?

Usually, the answer would be no. Because in Phase I research we are looking at the actions of research medicines, we may not know what would happen to your body (medicine interactions), or how your body responds to the research medicine if you have any underlying condition. Besides, it would not be ethical of us to ask you stop taking medications you need in order to take part.

I'm female and take the contraceptive pill, can I take part?

Yes! We require that all females of child bearing potential who take part in clinical trials are using at least two contraceptive methods from which one must be a barrier method (condom or occlusive cap [diaphragm or cervical/vault caps] used with spermicidal foam/gel/film/cream/suppository) throughout the duration. This may be the pill, implantable/injectable contraceptives, or documented sterilisation. We will also test you for pregnancy before and during a trial.

View all frequently asked questions