Frequently asked questions.

Phases of a Clinical Trial

NUMBER OF PARTICIPANTS
LENGTH OF STUDY
GOALS
PHASE 1
  • 10-20 healthy volunteers
  • Days to weeks
  • Test if the drug is safe
PHASE 2
  • 100-300
  • Months to 1-2 years
  • Test if the drug is safe
  • Find the best dose
PHASE 3
  • 1,000-10,000
  • Months to 1-2 years
  • Confirm safety and efficacy
  • Compare to current treatment
  • Provide data for government approval of drugs
PHASE 4
  • 10,000+
  • Years
  • Post-marketing surveillance
  • Real life – test long-term safety in a diverse patient population
At TrialsWest, we focus on Phase Ib, II, III and IV clinical trials.

What Does it Involve?

Clinical trials that we are involved in typically run for between 3 months and 2 years. Each visit usually takes between 1 and 5 hours, but this varies from trial to trial.

The types of tests or procedures that are performed during the visits can include (but again vary from trial to trial):

  • Breathing tests (spirometry)
  • Blood tests
  • Urine tests
  • Vital sign measurements (blood pressure, pulse, temperature, oxygen saturation)
  • Physical examinations
  • ECGs
  • Questionnaires

Before you can be involved in a study you must provide your written, informed consent by signing and dating the Consent Form. This is done after taking the time to read and have explained to you the Patient Information Sheet that tells you:

  • What the purpose of the clinical trial is
  • How you/we will determine whether you are eligible to participate
  • What you will have to do if you are involved
  • What are the benefits and risks of being involved
  • What the known side effects of the treatment(s) are
  • What happens after the trial ends

Participation in a clinical trial is ALWAYS voluntary and even if you decide to participate, you can withdraw at any time and for any reason.

Scroll to Top
Secret Link