Manufacture of medicines and pharmaceutical excipients 1

Describe the differences between drugs, excipients, and medicines, and their importance.
Explain the general philosophy behind modern medicine manufacture.
Outline the quality control framework for drugs and medicines in Egypt.
Learning Outcomes:
- Identify major routes of drug administration and dosage forms.

Drug: A single chemical entity, e.g., Paracetamol.
Medicine: The product that a patient takes, e.g., Panadol, which is a formulation containing one or more drugs.
Medicines are essentially drug formulations.

Definition of Formulation:
- A combination of one or more drugs (active ingredients) and one or more therapeutically inactive ingredients (excipients).
- Designed to be a stable product that delivers the correct drug dose to the desired site of action at the right rate.
- Common forms include tablets, capsules, solutions, and creams.

Reasons for Formulations:
- Low Dose: Newer drugs often require only microgram or milligram doses.
- Biological Issues: Drugs may require assistance for effective therapeutic effects.
- Physico-Chemical Issues: Stabilization through additives is often necessary.
- Special Therapeutic Needs: For instance, slow-release formulations.

Definition:
- Therapeutically inactive materials used in pharmaceutical formulations for specific functions.
Types of Excipients and Examples:
- Vehicle: Water for solutions.
- Diluent: Lactose in capsule formulations.
- Lubricant: Magnesium stearate in tablets.
- Preservative: Sorbic acid in aqueous formulations.
- Antioxidant: Ascorbic acid in aqueous solutions.
- Tonicity Adjusters: Sodium chloride in eye drops.

Early Records:
- 2700 BC: First written records of medicine making in Sumeria (clay tablets with prescriptions).
- 1500 BC: Ebers Papyrus in Egypt listing 875 prescriptions and 700 drugs, including many dosage forms still in use today.
Initial Products:
- Created from plant and animal extracts.
- Apothecaries prepared and sold medicines, often separately from diagnosing physicians.

BBC Documentary Episodes:
- Episode 1: Introduction.
- Episode 2: Pill making.
- Episode 3: Suppository making.
- Episode 4: Extraction of salicylic acid from willow bark.

Manufacturing Types:
- Primary: Production of active drug.
- Secondary: Production of the finished medicine (drug product).
Conditions: High-tech environment, clean, and controlled conditions with well-trained staff and adherence to Good Manufacturing Practices (GMP).
Regulatory Specifications: Reference to starting materials, intermediates, and finished product specifications.

Legal Framework: Law No. 151 (2019) regarding drug and medicine control.
- Key bodies include:
  1. Central Administration of the Authority’s President.
  2. Central Administration for Drug Policies and Market Support.
  3. Central Department of Biological, Innovative Products and Clinical Studies, etc.
International Oversight: Involvement of EMA, FDA, WHO, and ICH in drug regulation.

Definition: Origin of the term from Ancient Greek "drug making"; linked to ancient Egyptian practices.
Egyptian Pharmacopoeia (1953):
- Includes definitions, specifications, identification tests, purity tests, calibration methods, and preparation methods for medicines.
- Last updated version noted in 2005 with recent updates on herbal plants.
Other Notable Pharmacopoeias:
- British Pharmacopoeia (1864)
- United States Pharmacopoeia (1820)

Purpose: Ensures medicines are produced to high standards.
Regulations: Governed by Ministerial Decree No. 539/2007 and WHO guidelines.
Importance of Specifications:
- Specifies requirements at all stages of drug production.
- Ensures chemical and microbiological purity, correct physical attributes, and proper labeling.

Suggestions for extended study include:
- Aulton and Taylor, Aulton’s Pharmaceutics, 5th ed., Elsevier, 2017.
- Florence and Attwood, Physicochemical Principles of Pharmacy, 6th ed., Pharmaceutical Press, 2015.
- Legal references to Law No. 151 (2019).