Comprehensive Study Notes on Intro to Pharmaceutics and Pharmacy

Scope, Definition, and History of Pharmacy

  • Specific Objectives of Pharmacy Introductory Study:

    • Define pharmaceutics.
    • List the component areas of pharmaceutics.
    • Examine historical aspects regarding the emergence and development of pharmacy.

  • Definition and Fundamental Scope of Pharmacy:

    • Pharmacy is defined as the art and science of preparing and dispensing medication, as well as the provision of drug-related information to the public.
    • Core practice areas and professional responsibilities in pharmacy include:
    • Interpretation of prescription orders
    • Compounding
    • Labeling
    • Dispensing of drugs and devices
    • Drug product selection
    • Drug utilization reviews
    • Patient monitoring and intervention
    • Provision of drug-related and device information

  • Pharmacy as a Profession:

    • Pharmacy is the health profession that links the health sciences directly with the chemical sciences.
    • It is charged with ensuring the safe and effective use of pharmaceutical drugs.
    • Pharmacists act as experts on the action and use of drugs.
    • Fundamental professional questions for practitioners:
    • What does it take to be an expert?
    • What functions will a pharmacist perform after graduating?

  • Historical Progression of Pharmacy:

    • Ancient Era and Early Beginnings:
    • Pharmacy has been an integral part of everyday life since the dawn of humanity.
    • Folk knowledge of the healing properties of specific natural substances grew through trial and error.
    • The concept that outside forces in the form of remedies or drugs could influence bodily functions is considered one of humanity's greatest advances.
    • Healing practices began to be formally documented on clay tablets around 2600 B.C.2600\,\text{B.C.}
    • The Renaissance (1350−1650 A.D.1350 - 1650\,\text{A.D.}) — End of the Ancient Era:
    • Pharmacy became formally separated from medicine.
    • Pharmacy regulation was initiated.
    • University education became mandatory for pharmacists.
    • Importation of new and varied drugs from the Orient expanded.
    • New chemical substances were introduced into practice.
    • Prominent Figures of the Ancient Era:
    • Hippocrates: Recognized as the father of medicine; wrote the "Hippocratic oath" that physicians continue to take today.
    • Theophrastus: Recognized as the father of botany; experimented extensively with various plant types for medicinal application.
    • Paracelsus: Promoted chemically manufactured medications and discounted traditional herbal and botanical remedies.
    • The Empiric Era (1600−19401600 - 1940):
    • Pharmacopeias were introduced and utilized to safeguard public health.
    • Natural remedies such as roots, bark, herbs, and flowers were used and controlled under government oversight.
    • Scientific inquiry began questioning toxicological effects on the human body, creating widespread interest in drug testing and bodily responses.
    • In 17511751, Benjamin Franklin established the first hospital in the United States.
    • Jonathan Roberts served as the first hospital pharmacist to work at that hospital.
    • Rapid expansion of science throughout the 17th17^{\text{th}} and 18th18^{\text{th}} centuries led to the identification of many new drugs and chemical agents.
    • Industrialization Era:
    • War-related injuries and widespread illnesses generated a massive demand for drugs, prompting mass production through industrial machinery.
    • Scientific research introduced numerous new drugs alongside older remedies, increasing the incidence of adverse drug reactions and drug-drug interactions.
    • The rise in patient care demands and therapeutic duties within hospitals and pharmacies during this industrial transition defined the patient care era.

Areas of Pharmacy Practice

  • Career Paths and Employment Opportunities:
    • Graduates in pharmacy can pursue employment across a diverse range of specialized fields:
    • Community pharmacy
    • Hospital/Clinical pharmacy
    • Pharmaceutical industry
    • Representatives of pharmaceutical companies
    • Medical research
    • Legislation, marketing authorization, and regulatory agencies
    • Medicine wholesaler companies

Principles of Pharmaceutics and Drug Delivery

  • Definition of Pharmaceutics:

    • Pharmaceutics is the art and applied science of dosage form design, representing the critical interface between the drug and the body.
    • It is defined as the science and technology of the design and manufacture of dosage forms.
    • It encompasses the conversion of a raw drug substance into a finished medicine.

  • Interdisciplinary Foundations of Pharmaceutics:

    • Pharmaceutics is a broad field drawing concepts from multiple scientific disciplines:
    • Physical chemistry (organic and inorganic)
    • Medicinal chemistry
    • Anatomy and physiology
    • Microbiology
    • Atomic physics
    • Engineering (chemical and material)

  • Definitions and Conceptual Distinctions:

    • Drug: A chemical substance of known structure, other than a nutrient or an essential dietary ingredient, which produces a biological effect when administered to a living organism.
    • Sources: May be synthetic chemicals, chemicals extracted from plants or animals, or products of genetic engineering.
    • Alternative terminology: Active ingredient (AI), Active pharmaceutical ingredient (API), or Medicinal agent.
    • Medicine: A chemical preparation that usually (but not necessarily) contains one or more drugs, administered with the intention of producing a therapeutic effect.
    • Composition: Contains auxiliary substances (such as excipients, stabilizers, and solvents) to make the formulation convenient for use.
    • Rule of administration: To count as a drug in this context, the substance must be administered as such directly, rather than released by internal physiological mechanisms.

  • Sequential Stages of Drug Development:

    1. Drug discovery or synthesis
    2. Isolation
    3. Purification
    4. Testing (pharmacological and toxicological)
    5. Pharmaceutics (formulation and dosage form production)

  • Uniqueness of Pharmaceutics to Pharmacy:

    • Physicians and other prescribers do not study or apply physical pharmaceutical principles.
    • Pure chemists and engineers do not receive extensive biological training.
    • While lay individuals can read disease reviews and act as armchair prescribers, only a trained pharmacist possesses the expertise required to deliver a drug safely and effectively.

Dosage Form Design, Logistics, and Categorization

  • Logistical Considerations in Dosage Form Design:

    • Storage Parameters:
    • Rate of degradation and determination of expiration dates.
    • Physical state (liquid vs. solid).
    • Environmental storage conditions (e.g., temperature and humidity limits).
    • Packaging containers: inertness of material and risk of microbial or chemical contamination.
    • Compatibility Factors:
    • Interactions between active ingredients (active vs. active).
    • Interactions between active ingredients and "inert" excipients.
    • Interactions between the drug/excipients and the primary container.
    • Organoleptic Considerations ("Pharmaceutical Elegance"):
    • Physical appearance
    • Taste
    • Smell
    • Tactility
    • Particle/unit size
    • Manufacturing Considerations:
    • For solid powders: flowability characteristics and handling behaviour.

  • Essential Prerequisites for Designing a Dosage Form:

    • Physicochemical Properties of the Drug:
    • Chemical reactivity and stability profiles.
    • Solubility, acid/base properties (pKapKa), and solid-state behaviour.
    • Biopharmaceutical Considerations:
    • Intended site of action (systemic vs. topical delivery).
    • Location and extent of drug absorption.
    • Intended onset of action (e.g., immediate-release, sustained-release, or pulse-release profiles).

  • Comprehensive List of Dosage Forms:

    • Solid Dosage Forms:
    • Powders
    • Tablets
    • Capsules (hard and soft)
    • Suppositories
    • Ointment, cream, gel, etc.
    • Aerosol
    • Lozenge
    • Cigarette
    • Liquid Dosage Forms:
    • Solutions
    • Suspensions
    • Gaseous Dosage Forms

  • Core Component Disciplines of Pharmaceutics:

    1. Physical pharmaceutics
    2. Biopharmaceutics
    3. Dosage form design
    4. Manufacture
    5. Pharmaceutical microbiology

  • Core Academic References:

    • Remington: The Science and Practice of Pharmacy (Remington pharmaceutical sciences)