What are Medicines?

Definition and Terminology

Medicines, also known as pharmaceuticals or drugs, are substances or combinations of substances administered for the diagnosis, cure, treatment, or relief of symptoms, or for the prevention of disease. They may also be intended to affect the structure or function of the body.

• Medicines: Substances used to treat or prevent diseases.

• Pharmaceuticals: Products developed for medical use, including medicines and devices.

• Drugs: Often used interchangeably with medicines, but may also refer to substances with potential for abuse.

Key Point: Medicines are essential for maintaining and restoring health, and their use must be carefully managed to ensure safety and effectiveness.

Therapeutic Goods

Categories of Therapeutic Goods

Therapeutic goods encompass a broad range of products used in healthcare. They are generally classified into:

• Medicines: Includes prescription, over-the-counter (OTC), and complementary medicines (e.g., paracetamol, echinacea, vaccines).

• Biological Products: Made from or containing human cells or tissues (e.g., stem cells, blood products, tissue therapies).

• Medical Devices: Instruments or apparatuses used for medical purposes (e.g., pacemakers, glucose monitors, syringes, surgical instruments).

• Others: Disinfectants, antiseptics, and ingredients/components used in manufacturing therapeutic goods.

Note: Foods and cosmetics are generally not considered therapeutic goods.

Types of Medicines

Prescription vs. Non-Prescription Medicines

Medicines are classified based on how they are obtained and used:

• Prescription Medicines: Require a doctor's prescription (e.g., antibiotics).

• Non-Prescription Medicines: Can be obtained without a prescription, including OTC medicines (e.g., paracetamol, anti-allergic medicines).

Over-the-Counter (OTC) Medicines

• Accessible without prescription.

• Used for common, minor health problems that people can self-treat.

• Generally considered safe and effective if taken according to instructions.

• Dosage and side effects are clearly labeled on the package.

Forms of Medicines

Medicines are available in various forms, including tablets, capsules, liquids, creams, patches, inhalers, and injections.

Brand Name vs. Generic Medicines

Definitions and Differences

Medicines can be marketed under a brand name or as a generic product:

• Brand Name: The trade name given by the manufacturer (e.g., Panadol, Glucophage).

• Generic Name: The chemical or scientific name of the active ingredient (e.g., paracetamol, metformin hydrochloride).

Comparison Table

Example: Atorvastatin (generic) vs. Lipitor (brand)

Price Differences

Key Point: Generic drugs are usually much cheaper than brand drugs, but have the same active ingredient and therapeutic effect.

Key Terms in Medicine Use

Indication, Contraindication, and Interaction

• Indication: The use of a drug for treating a particular disease. Example: "Diabetes is an indication for insulin."

• Contraindication: A situation in which a medicine should not be used because it may be harmful. Example: Bleeding disorder is a contraindication for aspirin.

• Interaction: A change in a drug's effect when taken with another drug, food, or supplement. Types: Drug + drug, drug + herb, drug + food.

Side Effects and Adverse Drug Reactions (ADR)

• Side Effect: A generally expected effect, which may be undesirable but is known.

• Adverse Drug Reaction (ADR): An unexpected, harmful effect.

• Example: Ibuprofen (NSAIDs):

  • Side effect: Heartburn

  • Adverse reaction: Skin reaction (rare, unexpected & harmful)

Mechanism Example

NSAIDs inhibit cyclooxygenase (COX) enzymes, reducing prostaglandin synthesis, which can lead to decreased protection of the stomach lining and result in heartburn.

Regulation of Medicines

Purpose of Regulation

Medicines are regulated to ensure:

• Efficacy: The medicine works for its intended use.

• Safety: Medicines do not cause unacceptable harm.

• Quality: Medicines are manufactured to high standards.

• Control of Access and Misuse: Prevent misuse of controlled or dangerous drugs.

• Public Confidence: Build trust in the safety and effectiveness of medicines.

• Consumer Protection: Safeguard against fake or misleading products.

Product Problems

Quality issues may arise during manufacturing, shipping, or storage, including:

• Counterfeit products

• Contamination

• Defective components

• Poor packaging or mix-up

• Stability concerns

• Device malfunctions

• Labeling errors

Example: A pharmacist identifies a foul odor and distended bottle in a liquid antacid, investigates the lot, and reports to authorities.

Relevant Laws and Regulations (Malaysia)

Medicine Registration and Authenticity

Registration Process

• Applicant submits product for evaluation.

• NPRA (National Pharmaceutical Regulatory Agency) evaluates for quality, efficacy, and safety.

• DCA (Drug Control Authority) makes the final decision.

• Approved products receive a MAL registration number.

Features of Registered Medicines

• MAL registration number (begins with MAL, followed by 8 digits and a letter).

• Hologram security label.

Categories of Registered Medicines

• 'A' for Controlled Medicines

• 'B' for Natural Product with Therapeutic Claims

• 'X' for General Medicine (OTC)

• 'T' for Natural Product

• 'N' for Health Supplements

• 'H' for Veterinary Products

How to Verify Product Registration Status

• Check the NPRA website or use the NPRA Product Status app.

• Scan the hologram security label using the FarmaChecker app.

Important Label Information

• Name and address of supplier/pharmacy

• Active ingredient name

• Patient name

• Date dispensed

• Usage instructions

• Prescription reference number

Poison Classification

Criteria for Classification

• Potential for abuse or dependence

• Severity of side effects or toxicity

• Therapeutic uses and intended indications

• Potential for harm if used without medical supervision

• Historical evidence of misuse or abuse

Poison vs. Non-Poison

• Poisons: Higher potential for harm, require prescription, record-keeping, and special storage.

• Non-poisons: Lower potential for harm or abuse, available OTC.

Pharmacist's Role and Common OTC Products

Pharmacist-Dispensed Products

• Antiseptics/skin disinfectants

• Lozenges/pastilles

• Topical analgesics/counter-irritants

• Topical nasal decongestants

• Emollients/skin protectants

• Keratolytics

• Anti-dandruff products

• Oral care products

• Anti-acne products

• Medicated plasters/patches

• Topical antibacterials/microbials

• Ocular/vaginal products

• Anti-allergic medicines

• Oral contraceptives

• Products for minor ailments/prevention/relief of symptoms

Summary Table: Brand vs. Generic Drugs

Case Study Example

A patient requests allergy medicine. The pharmacist offers Zyrtec (brand) and cetirizine 10 mg tablets (generic), both with the same active ingredient and effect. The only difference is brand and price.

Additional info:

• Regulation and safe use of medicines is a key aspect of personal health, ensuring that individuals receive effective and safe treatments for their conditions.

• Understanding the difference between brand and generic drugs helps consumers make informed choices and manage healthcare costs.