Dosage forms and routes of administration Nevine (2)

Good Morning

Welcome message highlighting the commencement of the session, emphasizing the importance of collaboration and active participation to maximize learning outcomes.

Course Overview

Course: PHAR201 Towards Unbounded Thinking

  • Institution: NewGiza University, School of Pharmacy

  • Instructor: Dr. Nevine Shawky, PhD

  • Contact: Nevine.shawkyl@ngu.edu.eg

  • Date: September 24

Learning Outcomes (LOs)

  • Key objective: Effectively describe the major routes of drug administration and the various types of dosage forms utilized in clinical practice.

  • Specific goals include:

    1. Understanding the foundational philosophy of pharmaceutical formulation, including its historical context and evolution.

    2. Identifying major routes of drug administration to patients, including their mechanisms of action.

    3. Understanding types of products commonly used in practice, their formulations, and therapeutic implications.

    4. Analyzing factors affecting the choice of route of administration, including pharmacokinetics and patient considerations.

Introduction to Pharmaceutics

  • Definition: The science of dosage forms design, focusing on the study of how drugs are formulated for delivery.

  • Focus: Converting a drug into a stable and effective formulation that optimizes therapeutic efficacy and safety.

Formulation Science

  • Definition: A scientifically engineered mixture of active pharmaceutical ingredients (APIs) and inert ingredients designed to deliver the correct dose to the right site in the body at the appropriate rate.

Importance of formulations:

  • Precision in adjusting low doses for newer drugs (e.g., mg or μg).

  • Addressing biological issues related to therapeutic effectiveness and patient compliance.

  • Utilizing physico-chemical additives for drug stabilization to ensure long-term effectiveness.

  • Meeting special therapeutic needs, such as controlled-release mechanisms for chronic conditions.

Key Aspects of Formulation Science

  • A multi-disciplinary field that incorporates knowledge from the disciplines of chemistry, biology, and engineering.

  • Includes:

    1. Design of new and existing drug formulations tailored to specific therapeutic needs.

    2. Research and development of innovative methods and technologies for drug delivery systems.

    3. Highlighting the unique position of pharmacy professionals in studying and implementing formulation science practices.

Dosage Forms

  • Definition: The gross physical form of the drug as prepared for administration to the patient (solid, liquid, semi-solid).

  • Means through which drug molecules are administrated to the intended target sites in the body, significantly influencing effectiveness and patient experience.

Types of Dosage Forms

Solid Forms:

  • Examples: Tablets, capsules, powders.

  • Advantages: Accurate dosing, stability, ease of transportation, and generally longer shelf life.

  • Disadvantages: Complexity in manufacturing, potential for gastric irritation, and unsuitability for certain administration routes.

Liquid Forms:

  • Examples: Solutions, suspensions, emulsions.

  • Advantages: Quick onset of action due to faster absorption, ease of administration in specific populations (pediatric, geriatric).

  • Disadvantages: Requirement for precise dosage measurements, potential for bulkiness in storage and transport.

Semi-Solid Forms:

  • Examples: Ointments, gels, creams, and pastes.

  • Advantages: Offers localized treatment with minimized systemic absorption; suitable for topical use.

  • Disadvantages: Challenges in application and potential for messiness in administration.

Administration Routes and Their Characteristics

Overview

  • The route of administration significantly impacts drug delivery efficiency and overall therapeutic outcomes, based on pharmacokinetic principles.

Main Routes of Drug Administration

  1. Buccal (inside mouth)

  2. Oral (swallow)

  3. Sublingual (under tongue)

  4. Nasal

  5. Rectal

  6. Vaginal

  7. Inhalation (to lungs)

  8. Ocular (eye)

  9. Aural (ear)

  10. Parenteral (subcutaneous, intravenous, intramuscular, etc.)

Factors Influencing Route Choice

  • Desired onset and duration of action, understanding how quickly a drug needs to work.

  • Drug characteristics such as stability, solubility, and metabolism behavior.

  • Patient-specific factors, including age, existing medical conditions, and personal preferences.

Specific Routes and Their Uses

  • Oral: Convenient for patients but may face first-pass metabolism issues, impacting bioavailability.

  • Buccal and Sublingual: Allow for rapid absorption directly into systemic circulation, bypassing the first-pass effect.

  • Ocular and Aural: Suitable forms can include drops or ointments, requiring specific application techniques.

  • Inhalation: Provides rapid absorption with minimal systemic effects; often used for respiratory conditions.

  • Injectable: A range of techniques exist for direct medication delivery, allowing for immediate therapeutic responses.

Conclusion

  • Formulation science plays a critical role in ensuring the efficacy and safety of drug delivery systems.

  • Understanding dosage forms and administration routes is vital for achieving optimal therapeutic outcomes tailored to patient needs and clinical scenarios.

  • Importance of considering various factors affecting the choice of administration methods to ensure effectiveness in treatment.

Closing Remarks

Thank you and good luck! Acknowledgment for participation in the session and encouragement to engage with the material as much as possible.