Tema 1: Análisis farmacéutico (11/03)

Introduction to the Course

Overview of the Instructor and Course Structure

• Jenica Tía Pinto Dávalos introduces herself as the instructor for both theoretical and practical components of the course.

• The fifth-year subjects are specialized, preparing students for their professional roles in pharmacy, particularly during internships in pharmaceutical industries.

Importance of Previous Knowledge

• The course builds on prior knowledge from earlier studies; students will not start from scratch but will apply foundational concepts learned previously.

• Key analytical techniques such as chromatography (HPLC), spectrophotometry, and volumetric methods have been covered in previous courses, providing a solid base for quality control discussions.

Expectations and Study Strategies

Student Engagement and Preparation

• Students are encouraged to actively participate without fear of judgment; understanding is crucial before exams.

• A humorous anecdote about students seeking help at her home highlights the importance of consistent study habits rather than last-minute cramming.

Resources and Class Structure

• Students do not need to take extensive notes during lectures since materials are available online; they should focus on listening and engaging with content.

• Weekly topics will be posted on Classroom along with quizzes that are optional but beneficial for assessment.

Course Logistics and Practical Components

Practical Sessions Organization

• Lists for practical sessions will be finalized once all student registrations are complete; this includes addressing any registration issues.

• Notifications regarding classes, slides, and quizzes will be regularly updated on Classroom to keep students informed.

Course Content Delivery

• The course consists of 2 hours of theory and 3 hours of practice weekly. It integrates various areas like general chemistry, analytical chemistry, pharmacology, etc., which serve as prerequisites for understanding quality control in pharmaceuticals.

Quality Control in Pharmaceuticals

Objectives and Methodologies

• Emphasis is placed on rigorous quality control standards required before medications reach consumers; adherence to pharmacopeia guidelines is essential.

• Students will learn to select appropriate analytical methods for assessing medication quality through systematic studies across different drug groups.

Teaching Methods

• Instruction will involve dialogic exposure complemented by exercises and questionnaire resolutions to reinforce learning outcomes.

Introduction to Pharmaceutical Analysis

Overview of Evaluation and Sampling

• The evaluation process in pharmaceutical analysis is both formative and summative, with partial exams valued at 50%, final exams at 25%, and practicals also at 25%.

• Discusses the necessity of sampling due to the impracticality of quality control on large batches, such as 10,000 tablets or 20,000 bottles of syrup.

Identification and Purity Testing

• Emphasizes the importance of identifying raw materials, including active ingredients and excipients. For example, confirming if a product labeled as aspirin contains acetylsalicylic acid.

• Highlights purity parameters set by pharmacopoeias that must not fall below 95% or exceed 100%, addressing concerns about adulterants or falsifications.

Quantitative Determination Methods

• Introduces analytical methods for quantitative determination including volumetric methods, chromatographic techniques, and spectrophotometric methods to assess active ingredients in medications.

Microbiological Control and Stability Studies

• Notes that microbiological control is not applicable to all pharmaceutical forms but is crucial for biological products, antimicrobials, and sterile products.

• Discusses stability studies focusing on physical stability and bioavailability while addressing safe disposal practices for expired medications in Bolivia.

Quality Assurance in Pharmaceuticals

Role of Government in Health Policy

• Underlines the lack of regulations regarding expired medication disposal in Bolivia despite WHO recommendations; highlights public health risks associated with improper disposal.

Importance of Quality Specifications

• Mentions that students will receive bibliographic support through guides and base texts available on a platform alongside lecture slides.

Pharmaceutical Control Measures

Introduction to Pharmaceutical Quality Control

• Begins discussing pharmaceutical analysis as an introduction to drug quality control within national health policies.

Essential Aspects of Drug Quality

• States that drugs are essential components within public health policy frameworks globally; emphasizes the role of ministries ensuring drug quality.

Key Specifications from Pharmacopoeia

• Lists critical specifications provided by pharmacopoeias: identity (active ingredient matching), effectiveness (therapeutic effect), potency (strength), purity (absence of impurities), and innocuity (non-toxic).

International Oversight

• Concludes with the assertion that drug quality is a shared concern among governments and international organizations like WHO which aim to foster industry development.

Pharmaceutical Quality Control and Its Evolution

The Importance of Quality in Pharmaceuticals

• The development of the pharmaceutical industry is stimulated through quality production, which is supported by the establishment of the first international pharmacopoeia by the World Health Organization.

• The International Pharmacopoeia outlines techniques and procedures that ensure quality production and promote ongoing research to enhance medication quality.

• Quality control in pharmaceuticals is driven not only by commercial interests but also by ethical considerations, ensuring that patients receive safe and effective medications.

• Legal implications arise from poor quality control; pharmacists bear responsibility for any errors in medication production or quality assurance, highlighting the importance of stringent standards.

• High-quality pharmaceuticals must meet purity standards, accurate dosages, efficacy, and minimal toxicity as mandated by pharmacopoeial guidelines.

Historical Context of Quality Control

• The concept of quality control dates back to 1559 in Nuremberg, Germany, where a unitary system was established for weighing medicinal ingredients used in compounding prescriptions.

• Early practices involved pharmacists preparing individualized medications based on specific prescriptions from physicians using rudimentary weight systems for ingredient measurement.

• Valerius Cordus authored a document called "Dispensatorium," detailing techniques for ensuring the safety of galenic preparations—marking an early form of pharmacopoeia.

Impact of Global Events on Pharmaceutical Development

• The two World Wars catalyzed significant advancements in pharmaceutical industrialization, transitioning from traditional galenic preparations to mass-produced therapeutic molecules.

• Post-war developments led to new potent medications being created as old remedies were deemed ineffective against diseases; this marked a shift towards modern pharmaceuticals.

Regulatory Changes and Generic Medications

• By 1947, regulations were established regarding the stability of liquid dosage forms; this laid groundwork for further standardization within pharmaceutical manufacturing processes.

• In the 1950s, the American Pharmacopoeia introduced dissolution tests for solid dosage forms to ensure consistent product performance across different manufacturers.

Emergence of Generic Drugs

• The 1960s saw the rise of generic drugs requiring proof of pharmaceutical equivalence; generics are defined as non-branded versions lacking commercial names but maintaining identical active ingredients.

• U.S. regulations mandated that both brand-name and generic drugs demonstrate equivalent attributes during quality control assessments to ensure patient safety and efficacy.

Pharmaceutical Evolution and Quality Control

The Development of Bio-pharmacy and Quality Control

• The focus on bio-pharmacy and pharmacokinetics began in the 1970s, leading to research on particle size, solvation degree, compression pressure, and crystalline network types.

• In 1975, the American Pharmacopoeia introduced in vivo and in vitro studies, demonstrating that quality is a fundamental property of medications. This ensures adherence to specifications.

Importance of Stability Studies

• Biodisponibility tests are crucial for proving a product's efficacy and ensuring the preservation of its properties over time through stability studies.

• Expiration dates are determined by stability studies that guarantee the conservation of medication properties throughout its shelf life.

Transformation of Pharmacy Practice

• The 20th century marked significant changes: medications became therapeutic resources, pharmacists specialized in pharmaceuticals, and pharmacies evolved into public health service institutions.

• Historically, pharmacists prepared galenic products based solely on prescriptions; today’s pharmacies primarily stock pharmaceutical specialties rather than engage in compounding practices.

Return to Compounding Practices

• There is a global trend towards returning to magistral pharmacy practices where some pharmacies exclusively prepare medications based on medical prescriptions instead of selling pharmaceutical specialties.

• The shift from personal preparation by pharmacists to industrial production involves various professionals like industrial engineers and biotechnologists managing equipment for large-scale production.

Industrialization vs Personal Preparation

• Medications transitioned from being personally prepared using natural sources to being produced industrially through organic synthesis due to the demand for active ingredients exceeding what natural sources can provide.

• This change has led to a "depersonalization" of pharmacy practice as pharmacists now dispense pre-manufactured products without providing personalized follow-up care or recommendations as they did previously.

Impact of World Wars on Pharmaceutical Industry

• The two World Wars catalyzed the formation of powerful pharmaceutical industries that industrialized medication production—shifting from unique patient-specific preparations to mass-produced batches ranging from thousands to hundreds of thousands of units per lot.

• Industrialization brought risks such as inadequate controls during new product development; notable cases like thalidomide highlight these dangers due to teratogenic effects observed in pregnant women.

Consumer Risks with Medication Access

• Easy access allows consumers in certain countries (like ours) to purchase individual pills without prescription requirements, increasing risks associated with irrational medication use compared to stricter regulations elsewhere that require full packaging sales only with prescriptions.

Quality Control in Pharmaceuticals

The Importance of Quality Control

• The irrational use of medications is linked to their high potency, which increases the risk of toxicity. This necessitates a robust quality control system.

• The World Health Organization (WHO) established the first international pharmacopoeia to standardize quality inspection across all countries.

• Initially named "Inspection of the Quality of Pharmaceutical Preparations," this document aimed to unify quality control procedures globally for manufacturers and technicians.

Defining Modern Pharmaceuticals

• The modern concept of pharmaceuticals extends beyond merely preventing or alleviating diseases; it emphasizes efficiency and safety in drug production.

• A modern pharmaceutical must have a declared formula, proven therapeutic action, and stable pharmaceutical form, such as tablets or syrups.

• Stability is crucial; for instance, aspirin cannot be administered via injection due to its instability in that form.

Characteristics of Specialty Pharmaceuticals

• Specialty pharmaceuticals differ from traditional medications by requiring authorization from health ministries and cannot be prepared in pharmacies without industrial equipment.

• These drugs must demonstrate efficacy, efficiency, stability, uniformity, and rational pharmaceutical forms.

Efficacy vs. Efficiency in Medications

• Efficacy refers to a medication's ability to achieve its therapeutic goal (e.g., pain relief), while efficiency relates to achieving that effect with optimal resource use over time.

• An example illustrates that an injectable form is more efficient than oral administration because it bypasses several physiological processes before entering circulation.

Conclusion on Drug Administration Forms

• Injectable forms are preferred for efficient drug delivery since they provide immediate access to the bloodstream compared to oral forms that require digestion.

Understanding Stability and Quality Control in Pharmaceuticals

The Concept of Stability

• Stability refers to the shelf life of a medication, defined as the time from production until it no longer meets pharmacopoeial specifications.

• It is directly linked to expiration dates, indicating how long a drug remains effective and safe for use.

Importance of Uniformity

• Uniformity pertains to the consistent content of active ingredients across all units within a batch; for instance, 100 randomly selected tablets should contain identical amounts of the active substance.

• This ensures that patients receive the same dosage regardless of which unit they consume from a given lot.

Quality Control Standards

• Quality control encompasses all tests and procedures that pharmaceutical drugs must pass, starting from raw materials to finished products.

• Different pharmaceutical forms (solid vs liquid) require distinct quality control methods as outlined in pharmacopoeias.

Definition and Purpose of Quality Control

• The World Health Organization defines quality control as a set of processes aimed at ensuring uniform preparation of drug batches that meet pharmacopoeial standards.

• Effective quality control results in products with optimal excellence, ensuring consistency across different production lots.

Consistency Across Batches

• Each produced unit must be monitored through controlled processes to guarantee that subsequent batches maintain the same quality specifications as previous ones. This is crucial for patient safety when medications are purchased over time from different batches.

Locations for Quality Control Implementation

• Quality control occurs not only in pharmaceutical manufacturing labs but also at raw material producers who must ensure identity, purity, and potency before supplying ingredients to manufacturers.

• Hospitals may conduct rigorous quality checks on new medications under clinical trials to assess their therapeutic effects and potential adverse reactions before they are widely used. These studies involve strict medical oversight during testing phases.

Quality Control in Pharmacies and Laboratories

Quality Control Procedures in Pharmacies

• The pharmacist conducts quality control upon receiving medications, checking for physical integrity and proper sealing of packages.

• Key checks include verifying the absence of cracks or stains on tablets, assessing organoleptic properties, and ensuring packaging integrity. Dates of expiration are also continuously monitored.

Role of Health Authorities

• Quality control is overseen by state organizations like the Ministry of Health, which has a dedicated department for medication quality assurance.

• In La Paz, CAMIT operates a laboratory that performs various analyses (physical, chemical, biological) to determine if medications can be marketed or need to be destroyed.

International Standards and Recommendations

• Organizations such as the World Health Organization (WHO) provide normative guidelines but do not conduct direct quality control; they recommend practices to governments through health ministries.

Analytical Protocols in Quality Control

• Pharmacists must maintain validated techniques for testing raw materials and finished products, including packaging and labeling standards. This documentation is crucial for regulatory compliance.

• Each batch undergoes rigorous checks before production begins, during intermediate phases, and after completion to ensure it meets pharmacopoeial specifications before distribution approval is granted.

Final Evaluation Process

• A final report detailing the quality assessment results must be prepared with bibliographic references used during analysis; this includes signatures from both the analyst and department head for accountability purposes.

• Duplicate copies of this document are kept—one for management review and another archived in the laboratory to address any future issues or complaints regarding product safety.

Responsibilities Following Adverse Events

• In cases of adverse events like deaths or intoxications linked to medications, the Ministry will request samples for forensic analysis to identify errors; responsibility falls on the pharmacist who signed off on those products.

Scope of Quality Control

• The scope extends beyond pharmaceuticals to include toxic substances and investigational samples under strict medical supervision; examples include vaccines that require stringent quality controls due to their critical nature highlighted during COVID outbreaks.

Sampling Techniques in Quality Control

• For effective quality control across large batches (e.g., 100,000 tablets), representative sampling techniques are employed rather than testing every unit individually. This ensures efficiency while maintaining accuracy in results.

Sample Preparation Methods

• Samples often require preparation methods such as pulverization or dissolution prior to analysis; this step eliminates interferences and concentrates active ingredients necessary for accurate measurement outcomes in diverse pharmaceutical forms (solid/liquid).

Quality Control in Pharmaceuticals

Importance of Quantitative Determination

• The quantitative determination is essential for interpreting results through statistical treatment, leading to a final product qualification. Accepting a lot means it can be marketed.

Acceptance and Rejection of Pharmaceutical Lots

• If a lot is rejected, the pharmaceutical industry must destroy it, resulting in significant financial loss due to investments in raw materials and production time. The pharmacist plays a crucial role in this decision-making process.

Legal Responsibility of Pharmacists

• Pharmacists bear legal responsibility for their decisions regarding product acceptance or rejection, impacting both the industry and public health. They must ensure quality from production to dispensing.

Analyzing Drug Composition

• For known compositions, pharmacists analyze drugs qualitatively and quantitatively; for polypharmaceuticals, they must isolate each active principle before analysis. This was historically more complex but has been simplified with modern techniques like HPLC (High-Performance Liquid Chromatography).

Handling Unknown Compositions

• In cases where drug labels are damaged or unreadable, pharmacists must conduct separation tests using organic solvents based on pH levels to identify components before proceeding with qualitative and quantitative analysis.

Objectives of Quality Control Education

• The overarching goal of quality control education is to integrate knowledge from various fields (chemistry, pharmacology) to achieve zero-error medication standards through scientific inspection methods. Practical application is emphasized alongside theoretical learning.

Historical Context of Pharmacopeia

• The first pharmacopeia was created as "Dispensatorium" in 1559; later developments included guidelines from the World Health Organization at the beginning of the 20th century during pharmaceutical industrialization. Understanding this history aids in grasping current practices in quality control.

Assignments and Expectations

• Students are encouraged to read assigned topics thoroughly and complete questionnaires related to them by specified deadlines during practical sessions without needing direct assistance from instructors unless necessary. This promotes self-directed learning within the curriculum framework.

Feedback and Practical Classes Overview

Class Structure and Feedback Mechanism

• The instructor plans to provide feedback on the first topic before starting the second one, allowing for questions and clarifications.

• Practical group sessions will be organized for the following week in classroom 203, located on the first floor of the old block, opposite the nutrition lab.

Importance of Preparation and Individual Work

• A student expresses a desire for feedback sessions before practical exams to enhance understanding of topics covered in class.

• The instructor emphasizes that practical work is mandatory and individual; each student must have their own practice guide available at a designated photocopier.

Challenges in Practical Execution

• The instructor notes that many students come unprepared to practical classes, often relying on others or previous year's guides instead of engaging with the material themselves.

• There is concern about students not taking responsibility during practical exercises, leading to inadequate learning experiences.

Exam Preparation Insights

• The instructor reassures students that practical exams are straightforward, focusing on fundamental concepts rather than complex techniques or external resources.

• Despite this simplicity, there has been a noted deficiency in student performance during past assessments.

Recommendations for Effective Learning

• Students are encouraged to read assigned texts regularly to avoid last-minute cramming before exams.

• The importance of resolving questionnaires after reading is highlighted as a way to facilitate effective feedback sessions in future classes.