Different Post-Marketing Surveillance Methods are used depending on the medicine, research objectives, patient population, and regulatory requirements.

The following are some widely used approaches:

1. Spontaneous Adverse Event Reporting

Spontaneous reporting is one of the most common methods of pharmacovigilance. Healthcare professionals, patients and pharmaceutical companies report suspected adverse drug reactions to relevant regulatory authorities or safety databases.

For example, the FDA Adverse Event Reporting System (FAERS) collects reports of adverse events and medication errors to support post-marketing safety surveillance.

These reports help researchers identify potential safety signals requiring further investigation.

2. Active Surveillance

Active surveillance involves proactively collecting safety information rather than waiting for adverse event reports.

Researchers may use patient registries, electronic health records, insurance claims and healthcare databases to identify potential safety concerns.

This approach can provide more structured information about drug exposure, patient outcomes and adverse events.

3. Post-Marketing Observational Studies

Observational studies evaluate the safety and effectiveness of medicines in routine clinical practice without assigning treatments through a controlled intervention.

Common study designs include:

• Cohort Studies: Follow groups of patients receiving specific treatments to assess outcomes over time.
• Case-Control Studies: Compare patients experiencing a particular adverse event with those who have not experienced it.
• Cross-Sectional Studies: Examine health outcomes and treatment patterns within a defined population at a particular point in time.

These studies help researchers understand treatment-related risks and patient outcomes.

4. Patient Registries and Healthcare Database Studies

Patient registries collect structured information about individuals with specific diseases or treatment experiences. Healthcare database studies use electronic medical records, hospital information systems and insurance claims data to evaluate drug utilisation and safety.

These methods are particularly useful for monitoring large patient populations and identifying long-term trends.

5. Post-Marketing Clinical Studies (Phase IV Studies)

Phase IV studies are conducted after a medicine receives marketing approval. They help researchers investigate additional safety concerns, evaluate treatment effectiveness and understand how medicines perform under real-world conditions.

These studies may also examine specific patient populations or treatment outcomes that were not fully explored during earlier clinical development.