Comprehensive Study Guide on Prescriptions and Respiratory Medications

Overview of Prescriptions

  • Definition and Importance of Prescriptions
    • Everyone has encountered prescriptions for medications.
    • Historically, prescriptions were handwritten by physicians, but the process has evolved.
  • Current Prescribing Practices
    • Many prescriptions are now sent electronically through systems like MyChart directly to pharmacies, reducing the need for printed copies.

Components of a Prescription

  • Essential Parts of a Prescription
    • Medication Name: Clearly indicates what the doctor is prescribing.
    • Patient Information: Includes the patient's name, address, and the date of the prescription for record-keeping and expiration purposes.
    • Inscription: Details the dosage and frequency of the medication, including specific instructions.
    • Example of Abbreviations Used:
      • PO: Per os (by mouth)
      • NPO: Nil per os (nothing by mouth)
      • BID: Twice a day
    • Signature: Necessary for authorization by a prescriber which can be a physician or a PA (Physician Assistant).
    • Generic Substitutions: Often there is a box to indicate if a generic substitute is acceptable, which might be less expensive.

Over-the-Counter (OTC) Medicines

  • Definition: Medications that can be purchased without a prescription (e.g., Tylenol, Motrin).
  • Importance of Proper Use:
    • Patients must adhere to the recommended dosage on labeling to avoid dangerous interactions and side effects.
    • Awareness of potential drug interactions is crucial, especially if a patient has underlying medical conditions or is taking prescription medications.

Drug Interactions

  • Types of Interactions
    • Highlighted importance of using databases to check for interactions between medications.
    • Patients should be informed about potential drug interactions, which can impact effectiveness and safety.
    • Familiarity with medication categories is essential for understanding interactions.

Administration of Respiratory Drugs

  • Respiratory Medications

    • Most respiratory drugs are administered via inhalation, which is preferred for targeting lung conditions without invasive procedures.
    • These medications are aerosolized and inhaled into the lungs.

  • Advantages of Inhalation

    • No needles required, making it safer and more comfortable for patients.
    • Smaller doses may be effective with fewer side effects compared to intravenous methods.
    • Rapid onset of action since the medication goes directly to the lungs.

  • Classification of Medications

    • Various categories of medications to be studied throughout the course.
    • Emphasis on the significance of understanding these classifications.

Abbreviations in Medical Prescriptions

  • Importance of Knowing Abbreviations

    • Clinicians often use abbreviations for efficiency, and understanding them is necessary for patient education and safety.

  • Common Medical Abbreviations

    • A (with line over it) - For anytime medications (e.g., b.i.d. = bis in die, twice a day)
    • cc = cubic centimeter
    • ml = milliliters (both cc and ml can be used interchangeably)
    • qd (once daily), qhs (at bedtime), prn (as needed)

Related Drug Groups and Effects

  • Categories/Groups of Medications Relevant to Respiratory Care
    • Overview of common drug categories with implications for respiratory care, including:
    • Adrenergic Agents: Expand bronchial passages (e.g., Albuterol).
    • Mucoactive Agents: Assist in clearing mucus from the airways.
    • Corticosteroids: Anti-inflammatory drugs used for various lung conditions.
    • Anti-infectives: Medications fighting infections that can affect respiratory health.
    • Neuromuscular Blocking Agents: Used during intubation and surgical procedures to facilitate ventilation.

Pharmacology Basics

  • Drug Phases

    • Administration Phase: Understanding how drugs are given (e.g., orally, IV, inhalation).
    • Pharmacokinetics: How drugs move through the body (absorption, distribution, metabolism, elimination).
    • Pharmacodynamics: The effects of the drug on the body and its mechanism of action.
    • Bioavailability: The proportion of the drug that reaches systemic circulation.

  • Absorption Factors

    • Affects how quickly and efficiently a drug enters the bloodstream. Bioavailability examples (e.g., morphine).

Metabolism and Elimination

  • Liver's Role in Drug Metabolism

    • The liver metabolizes drugs, affecting their effectiveness.
    • First Pass Effect: When drugs are metabolized more extensively within the liver before reaching systemic circulation.

  • Elimination Processes

    • How the body removes drugs, mainly through the kidneys.

Pharmacodynamics and Therapeutics

  • Understanding Drug Effectiveness
    • Potency, therapeutic index, and terms associated with drug action.
    • Synergism vs. Additivity: How combinations of drugs can enhance or simply add to each other’s effects.

Pharmacogenetics

  • Role of Genetics in Drug Response
    • How individual genetic differences can affect drug metabolism and efficacy.
    • Examples of medications affected by pharmacogenetics:
    • Isoniazid: Used for tuberculosis.
    • Succinylcholine: A neuromuscular blocking agent used in intubation.
    • Isoflurane: An anesthetic used in surgeries.

Conclusion

  • Throughout the semester, the focus will be on drug classifications, their effects, interactions, and the critical role of pharmacology in respiratory care. Continuous reference to databases and staying informed about medication interactions will be essential through clinical practice.