Clinical research is the study of health and illness in people. It tests whether new drugs, vaccines, devices, diagnostic tests and treatments are safe and work, and it studies how diseases develop. The best-known type is the clinical trial, where volunteers receive a treatment and their results are compared. Trials run in phases (I to IV), follow Good Clinical Practice (ICH-GCP), need ethics-committee approval and the participant’s informed consent, and in India must be registered with CTRI.
Key takeaways
- Clinical research tests drugs, vaccines, devices and treatments in people, and studies disease.
- A clinical trial assigns people to an intervention; an observational study only watches.
- Trials run in four phases, from 20–100 people in Phase 1 to thousands in Phase 4 (FDA).
- ICH-GCP, ethics committees and informed consent protect every participant.
- It offers careers in site work, monitoring, data, drug safety, programming and regulation.
On this page ⌄
What is clinical research? The meaning in simple words
Clinical research is health research that involves people. It answers questions such as: Is this new medicine safe? Does it work better than what we use today? What is the right dose? Who should not take it? It also studies why people get ill and how diseases progress.
It covers medicines, vaccines, medical devices, diagnostic tests, surgery, diet and lifestyle changes. Without it, no new treatment can be approved by regulators such as India’s CDSCO or the US FDA.
Safety
Finds side effects and the doses people can safely take.
Effectiveness
Shows whether a treatment actually helps patients.
Knowledge
Explains how diseases start, spread and respond to care.
Approval
Provides the evidence regulators need to approve a product.
What is clinical research vs a clinical trial? The main types
All clinical trials are clinical research, but not all clinical research is a trial. The World Health Organization defines a clinical trial as a study that prospectively assigns people to one or more health interventions to measure the effect on their health.
What happens
- Interventional study (clinical trial)
- Researchers give participants a treatment and compare results
- Observational study
- Researchers only watch and record; they do not assign treatment
- Real-world evidence study
- Uses data from hospital records, registries or insurance claims
Example
- Interventional study (clinical trial)
- A new diabetes drug vs the current standard drug
- Observational study
- Following smokers and non-smokers for 10 years
- Real-world evidence study
- Checking how a vaccine performs after launch
The phases of a clinical trial
Drug trials move through phases. Each phase must show acceptable safety before the next begins. Figures below are from the US FDA.
Participants
- Phase 1
- 20–100 healthy volunteers or patients
- Phase 2
- Up to several hundred patients
- Phase 3
- 300–3,000 patients
- Phase 4
- Several thousand patients
Main purpose
- Phase 1
- Safety and dosage
- Phase 2
- Does it work? Side effects
- Phase 3
- Confirm it works; monitor adverse reactions
- Phase 4
- Long-term safety and effectiveness after approval
Typical length
- Phase 1
- Several months
- Phase 2
- Several months to 2 years
- Phase 3
- 1 to 4 years
- Phase 4
- Ongoing
Some programmes also run a small Phase 0 (micro-dosing) study before Phase 1 to see how a drug behaves in the body. Learn more in our guide to how to become a clinical research associate, who monitors these trials.
How a clinical trial works, step by step
- 1
Protocol
The sponsor writes the plan: who can join, what is given, what is measured and how safety is checked.
- 2
Approvals and registration
An ethics committee and the regulator (CDSCO in India) review the plan. In India, the trial must be registered with CTRI before the first patient is enrolled.
- 3
Informed consent
Each participant learns the risks and benefits and agrees in writing. They can leave at any time.
- 4
Conduct and monitoring
Site staff (CRCs) run the visits; monitors (CRAs) check that the protocol and GCP are followed.
- 5
Data and safety
Data teams clean the data in EDC systems; drug safety teams report side effects to regulators on time.
- 6
Analysis and submission
Statisticians and SAS programmers analyse the results, and regulatory teams submit them for approval.
Who is involved in clinical research?
Role
- Sponsor
- Usually a pharma, biotech or device company that funds and owns the trial
- CRO (contract research organisation)
- Runs trial work for the sponsor — monitoring, data, safety, statistics
- SMO (site management organisation)
- Supports hospitals and doctors to run trials at their site
- Investigator
- The doctor responsible for the trial at a site
- Ethics committee
- Independent group that protects participants’ rights and safety
- Regulator
- CDSCO in India, FDA in the USA, EMA in the EU — approves trials and products
- Participants
- Volunteers — patients or healthy people — who take part
Ethics and rules that protect participants
- ICH E6(R3) Good Clinical Practice — the global standard for running trials, finalised by ICH in January 2025.
- Declaration of Helsinki — the World Medical Association’s ethical principles, most recently revised in October 2024.
- India’s New Drugs and Clinical Trials Rules, 2019 — the law for trials in India, overseen by CDSCO.
- CTRI registration — mandatory in India since 15 June 2009, before the first participant is enrolled.
- Informed consent — every participant must understand the study and agree freely.
Clinical research in numbers
Figures from ClinicalTrials.gov, checked 8 October 2026. Many Indian trials are listed only on India’s CTRI, so Indian totals are higher.
47,170
interventional trials recruiting participants worldwide.
6,652
studies on ClinicalTrials.gov that have listed a site in India.
490
interventional trials recruiting with a site in India right now.
3rd
India’s rank in world pharma production by volume (Dept. of Pharmaceuticals, 2025-26).
Careers in clinical research
Clinical research needs many skills. Pharmacy, life science, nursing and medical graduates can all build a career here.
Site and monitoring
Clinical Research Coordinator (CRC), Clinical Research Associate (CRA), Clinical Trial Assistant.
Clinical data
Clinical Data Coordinator, Clinical Data Manager, Clinical SAS Programmer.
Drug safety
Drug Safety Associate, PV Scientist, aggregate report and signal roles.
Regulatory and writing
Regulatory Affairs Executive, Medical Writer, Medical Coder.
Not sure which fits you? Compare two popular paths in CDM vs pharmacovigilance, or see all courses.
How to start learning clinical research
Duration
- CRA Training Program
- 1.5 months
- PG Diploma in Clinical Research
- 7.5 months
Fee
- CRA Training Program
- ₹19,500
Best for
- CRA Training Program
- A short start in site and monitoring work
- Advanced Diploma in Clinical Research
- CR, CDM, PV and regulatory basics, with an internship
- PG Diploma in Clinical Research
- The full programme with Clinical SAS and an internship
All run live online or in our HSR Layout classroom, Monday to Friday, with trainers who have 10 to 20+ years of industry experience.
Where BCRI students work
Recent placements published on the BCRI Career Hub.
PlacementSreekutty Shaji
Project support coordinator 2 · PPD
PlacementReenu
Investigators grants specialist · Novotech
PlacementGowthami sree
Clinical Research Coordinator · Max Clinical Research
PlacementReethika
QA specialist · Weltrix Biometrics
Placements across BCRI programmes. Placement assistance, not a job guarantee. See all on the Career Hub
FAQs
What is clinical research in simple words?
It is research done with people to find out whether medicines, vaccines, devices and treatments are safe and work, and to understand diseases better.
What is the difference between clinical research and a clinical trial?
A clinical trial is one type of clinical research, where participants are assigned a treatment. Clinical research also includes observational studies, where researchers only watch and record.
What are the 4 phases of clinical research?
Phase 1 tests safety and dose in 20–100 people; Phase 2 tests whether it works in up to several hundred patients; Phase 3 confirms results in 300–3,000 patients; Phase 4 tracks long-term safety after approval.
Who regulates clinical research in India?
The Central Drugs Standard Control Organisation (CDSCO), under the New Drugs and Clinical Trials Rules, 2019. Ethics committees approve each trial, and trials must be registered with CTRI.
Is clinical research a good career?
Yes, for science graduates who like careful, rule-based work. India is a major centre for global trials, data management and drug safety, with roles at CROs, pharma companies, hospitals and IT firms.
Who can study clinical research?
Graduates in pharmacy, life sciences, biotechnology, nursing, medicine (including BDS, BAMS, BHMS) and allied health.