💊 Pharmaceuticals Viva

GMP is a system that ensures pharmaceutical products are consistently produced and controlled according to quality standards. It covers all aspects of production — from raw materials, premises, and equipment to training and hygiene.

Key GMP Principles:

• All processes are clearly defined and systematically reviewed
• Equipment is properly maintained and calibrated
• Operators are trained and follow Standard Operating Procedures (SOPs)
• Records are maintained for traceability and compliance
• Proper storage and distribution to minimize quality risk
• A system to recall any batch if needed

Importance: Ensures patient safety, drug efficacy, regulatory compliance, and market access. Without GMP, products may be contaminated, improperly dosed, or ineffective.

Qualification: Documented verification that equipment, systems, or utilities are properly installed, work correctly, and produce expected results. It has four stages:

• DQ (Design Qualification): Verifying design meets requirements
• IQ (Installation Qualification): Verifying correct installation
• OQ (Operational Qualification): Verifying operation within specified ranges
• PQ (Performance Qualification): Verifying consistent performance under actual conditions

Validation: Documented evidence that a process, method, or system consistently produces results meeting predetermined specifications. Examples: Process validation, cleaning validation, method validation, computer system validation.

Key Difference: Qualification is for equipment/systems; validation is for processes/methods.

An SOP is a written document providing detailed instructions for performing a specific task consistently and correctly.

Typical SOP Contents:

• Title & SOP Number: Unique identification
• Objective: Purpose of the procedure
• Scope: Where and to whom it applies
• Responsibility: Who performs and supervises
• Materials/Equipment: Required resources
• Procedure: Step-by-step instructions
• Documentation: Forms, records to fill
• References: Related SOPs, guidelines
• Revision History: Change log with dates and approvals

SOPs must be reviewed periodically (typically every 2-3 years) and whenever processes change.

Quality Assurance (QA):

• Proactive — prevents defects before they occur
• Process-oriented — focuses on systems, procedures, and standards
• Includes GMP compliance, documentation, audits, training, change control
• Ensures the entire quality management system is functioning

Quality Control (QC):

• Reactive — detects defects in finished/in-process products
• Product-oriented — focuses on testing and inspection
• Includes chemical, physical, and microbiological testing
• Uses laboratory instruments (HPLC, UV, dissolution apparatus)

Analogy: QA is building the right road, QC is checking if the road meets standards after construction.

HPLC (High-Performance Liquid Chromatography) is an analytical technique used to separate, identify, and quantify components in a mixture.

How it works:

• Mobile Phase: Liquid solvent (or solvent mixture) that carries the sample through the system
• Stationary Phase: Column packed with solid particles (e.g., C18, silica)
• Pump: Pushes mobile phase at high pressure (up to 6000 psi)
• Injector: Introduces sample into the mobile phase stream
• Column: Where separation occurs based on differential interaction with stationary phase
• Detector: UV/Vis, PDA, RI, or fluorescence — detects separated components
• Data System: Software generates chromatograms for analysis

Applications: Assay testing, impurity profiling, dissolution testing, stability studies.

DGDA (Directorate General of Drug Administration) is the national drug regulatory authority of Bangladesh, operating under the Ministry of Health and Family Welfare.

Key Functions:

• Granting manufacturing licenses and GMP certificates to pharmaceutical companies
• Registering new drugs and approving drug formulations
• Conducting inspections of manufacturing facilities
• Monitoring drug quality through testing and market surveillance
• Regulating drug pricing and controlling essential drug lists
• Overseeing import/export of pharmaceutical products
• Enforcing the Drug Act 1940 and Drug Control Ordinance 1982

A Drug Master File (DMF) is a confidential document submitted to a regulatory authority (like US FDA) containing detailed information about an API (Active Pharmaceutical Ingredient), excipient, or packaging material.

Types of DMF (US FDA):

• Type I: Manufacturing site, facilities, operating procedures (no longer accepted)
• Type II: Drug substance (API), intermediates — most common
• Type III: Packaging materials
• Type IV: Excipients, colorants, flavors
• Type V: FDA-accepted reference information

Importance: Protects proprietary information. API manufacturers file DMFs so drug product manufacturers can reference them in their ANDA/NDA submissions without disclosing trade secrets.

Pharmacovigilance (PV) is the science of detecting, assessing, understanding, and preventing adverse effects or any drug-related problems.

Key Activities:

• ADR Reporting: Collecting Adverse Drug Reaction reports from healthcare professionals and patients
• Signal Detection: Identifying new safety concerns from reported data
• Risk Assessment: Evaluating the benefit-risk balance of medicines
• PSUR (Periodic Safety Update Report): Regular safety reports to regulatory authorities
• Risk Management Plans: Strategies to minimize identified risks

Importance: Clinical trials involve limited patients over short periods. Post-marketing surveillance captures rare and long-term adverse effects in the real-world population.

Side Effect: Any unintended effect of a drug occurring at normal therapeutic doses. Can be beneficial or harmful. Example: Aspirin thins blood (therapeutic for heart patients, side effect for pain relief use).

Adverse Drug Reaction (ADR): A harmful, unintended response to a medicine at doses normally used for treatment. ADRs are always negative. Example: Anaphylaxis from penicillin.

ADR Classification (WHO):

• Type A (Augmented): Dose-dependent, predictable, common (80%). E.g., bleeding with anticoagulants
• Type B (Bizarre): Dose-independent, unpredictable, rare. E.g., penicillin allergy
• Type C (Chronic): Related to cumulative dose. E.g., osteoporosis with long-term steroids
• Type D (Delayed): Appear after prolonged use. E.g., carcinogenicity

Bioavailability (BA): The rate and extent to which the active ingredient is absorbed from a drug product and becomes available at the site of action. Measured by AUC (Area Under Curve), Cmax (peak concentration), and Tmax (time to peak).

Bioequivalence (BE): Two drug products are bioequivalent when they have similar bioavailability under similar conditions. A generic drug must demonstrate BE with the reference/innovator product.

BE Study Design:

• Randomized, crossover study in healthy volunteers (usually 24-36)
• Compare AUC and Cmax of test vs reference product
• 90% confidence interval must fall within 80-125% acceptance range
• Required for ANDA (Abbreviated New Drug Application) approval

Stability Study: Evaluates how the quality of a drug product changes over time under the influence of temperature, humidity, and light. Used to determine shelf life and storage conditions.

ICH Stability Conditions (Zone IVa — Bangladesh):

• Long-term: 30°C ± 2°C / 65% RH ± 5% — 12, 24, 36 months
• Accelerated: 40°C ± 2°C / 75% RH ± 5% — 0, 3, 6 months
• Intermediate: 30°C ± 2°C / 65% RH ± 5% — used if accelerated fails

Photostability: ICH Q1B — exposure to light (1.2 million lux hours + 200 Wh/m² UV)

Testing: Assay, dissolution, impurities, physical appearance, moisture content at each time point.

A strong answer should cover:

• Impact on health: "Pharmaceuticals directly improve and save lives — it's meaningful work"
• Industry growth: "Bangladesh's pharma industry exports to 150+ countries and is growing rapidly, especially with LDC graduation in 2026"
• Science-driven: "I enjoy applying my pharmacy/chemistry education to solve real-world problems"
• Quality focus: "The emphasis on precision, documentation, and compliance aligns with my detail-oriented personality"
• Career progression: "Pharma offers diverse career paths — from production to R&D, QC, regulatory affairs, and marketing"