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newSchoolWorks.com › VoTechWorks › Health & Personal Services › Pharmacy Technician › Pharmacology and the Top 200 Drugs › Lesson 10
HLT-PHAR41-02 · Lesson 10 · 15 clock hours · lab

Dosage forms, routes, stability and storage

Objective. Match dosage forms to routes, read storage conditions (room temperature, refrigerated 2–8 °C, frozen, protect from light) and handle drugs so they stay stable.

⚠ Pending professional review

This lesson, its worked examples and its practice questions has not yet been verified by a licensed pharmacist or by a certification or approval body. It is a study draft and may contain errors. Do not use it to make decisions about any patient or medication. Always follow your instructor, your supervising professional, and current official references and regulations.

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What Is a Dosage Form?

A dosage form is the physical vehicle that delivers a drug to the body. Choosing the right dosage form matters because it controls how fast the drug works, where in the body it acts, and how long it stays effective. Pharmacy technicians must recognize common dosage forms, know which route of administration each one uses, and handle every product so it stays stable until the patient uses it.

Dosage Forms and Their Routes

Oral (by mouth) forms are the most common. They include tablets, capsules, caplets, solutions, suspensions, syrups, elixirs, and orally disintegrating tablets (ODTs). Tablets and capsules are solid; solutions are already dissolved; suspensions contain drug particles floating in liquid and must be shaken before use.

Sublingual and buccal forms dissolve under the tongue or in the cheek pouch, respectively. Nitroglycerin sublingual tablets are a classic example. These routes allow rapid absorption directly into the bloodstream, bypassing the digestive system.

Topical forms are applied to the skin. They include creams, ointments, gels, lotions, foams, and transdermal patches. Creams are oil-in-water emulsions that feel lighter; ointments are water-in-oil and feel greasier and more occlusive. Transdermal patches deliver drug through the skin into the systemic circulation over hours or days.

Ophthalmic (eye) and otic (ear) forms are sterile or near-sterile drops and ointments formulated for those specific cavities. Ophthalmic products must always be sterile; otic products used for the outer ear canal do not have to be sterile but must be free of harmful contaminants.

Nasal forms include sprays and drops administered into the nasal passages. Some act locally (decongestants); others provide systemic absorption (certain hormone products).

Inhalation forms include metered-dose inhalers (MDIs), dry-powder inhalers (DPIs), and nebulizer solutions. These deliver drug directly to the lungs for local effect (asthma, COPD) or rapid systemic absorption.

Rectal and vaginal forms — suppositories, enemas, creams, and rings — deliver drug through mucous membranes. Suppositories are solid at room temperature but melt at body temperature.

Parenteral routes bypass the digestive tract entirely. Common parenteral routes include intravenous (IV), intramuscular (IM), and subcutaneous (SubQ). Parenteral products must be sterile. They come as solutions, suspensions, powders for reconstitution, and lyophilized (freeze-dried) vials.

Reading Storage Conditions

Every drug label and package insert states how the product must be stored. Four main categories appear on US labels:

Moisture is another stability threat. Some drugs (aspirin, effervescent tablets) degrade rapidly when exposed to humidity. Desiccant packets inside the original container help, so technicians should advise patients to keep medications in a cool, dry place — not a bathroom medicine cabinet.

Handling to Maintain Stability

Cold-chain management refers to keeping refrigerated or frozen drugs within the required temperature range from manufacturer to patient. In the pharmacy, this means logging refrigerator and freezer temperatures at least daily and recording any excursion (a period when temperature went outside the acceptable range). If an excursion occurs, the technician must document it and notify the pharmacist; the pharmacist then determines whether affected products can still be used, based on manufacturer data.

Light-sensitive drugs should remain in their original amber or opaque containers. IV admixtures containing light-sensitive drugs (for example, certain antibiotics or total parenteral nutrition) may be wrapped in opaque bags or tubing covers.

Reconstituted products have a shortened beyond-use date (BUD). When a powder is mixed with sterile water or another diluent, the clock starts. For example, amoxicillin oral suspension reconstituted in the pharmacy must be dispensed with a label stating to refrigerate and discard after 14 days (per manufacturer labeling). Technicians must affix the correct BUD at the time of preparation.

Suppositories stored incorrectly at warm temperatures will melt and lose their shape and dose uniformity. They should be kept refrigerated or in a cool location as directed.

Transdermal patches must be stored in their sealed pouches until use; exposure to air or heat can cause the drug to migrate out of the reservoir layer.

Practical Summary

When you receive a drug in the pharmacy: (1) read the storage label immediately, (2) place the product in the correct storage area, (3) check expiration and beyond-use dates, (4) use original light-protective packaging, and (5) document refrigerator and freezer temperatures every day. These five habits keep patients safe and drugs effective.

Key terms10

Dosage formThe physical vehicle (tablet, capsule, solution, patch, etc.) that carries a drug dose and determines its route of administration.
Route of administrationThe path by which a drug enters or contacts the body, such as oral, sublingual, topical, inhalation, or parenteral.
Controlled room temperature (CRT)USP-defined storage temperature of 68–77 °F (20–25 °C), with brief excursions allowed between 59–86 °F (15–30 °C).
Refrigerated storageStorage maintained between 36–46 °F (2–8 °C) as required for products such as certain insulins and vaccines.
Cold chainThe unbroken series of temperature-controlled steps that keeps refrigerated or frozen drugs within required temperature limits from manufacturer to patient.
Temperature excursionA period when a storage unit's temperature falls outside its required range; must be documented and reported to the pharmacist.
Beyond-use date (BUD)The date or time after which a compounded or reconstituted product must not be used; different from and often shorter than the manufacturer's expiration date.
SuspensionA liquid dosage form in which drug particles are dispersed but not dissolved; requires shaking before use to ensure uniform dosing.
LyophilizedFreeze-dried; describes powders made by removing water under low pressure, requiring reconstitution before administration.
Protect from lightA storage instruction indicating the drug degrades when exposed to light; requires amber, opaque, or foil-wrapped containers.

Worked examples2

1. A technician receives a shipment of insulin glargine vials. The label states 'Refrigerate at 36–46 °F (2–8 °C); do not freeze.' The refrigerator log shows the temperature was 50 °F for six hours overnight. What should the technician do?
    Answer:
    2. A prescription calls for amoxicillin 250 mg/5 mL oral suspension, 150 mL. The technician reconstitutes the powder with the correct volume of purified water. What label information must be added, and what counseling point should the pharmacist convey?
      Answer:
      In class: Dosage-form identification bench · Refrigerator log and excursion scenario · Light-sensitive and moisture-sensitive packaging
      Materials: Dosage-form samples, data-logger thermometer
      Check: Storage practical: competent

      Practice check8

      Answer each question, then check it. Nothing is recorded; this is your own practice.

      PTCE domain: Medications
      1. A patient needs a drug to be absorbed very rapidly to relieve acute chest pain. Which dosage form and route best meets this need?
      PTCE domain: Medications
      2. The United States Pharmacopeia defines controlled room temperature as:
      PTCE domain: Patient Safety and Quality Assurance
      3. A technician is preparing an IV admixture that contains a light-sensitive antibiotic. What is the most appropriate action?
      PTCE domain: Order Entry and Processing
      4. Which of the following dosage forms MUST be shaken before each use to ensure the patient receives an accurate dose?
      PTCE domain: Patient Safety and Quality Assurance
      5. A pharmacy refrigerator temperature log shows 50 °F at the 8 a.m. check. Refrigerated storage requires 36–46 °F. What is the technician's FIRST action?
      PTCE domain: Order Entry and Processing
      6. Amoxicillin 250 mg/5 mL oral suspension is reconstituted in the pharmacy today. According to standard manufacturer labeling, what beyond-use date and storage instructions should appear on the label?
      PTCE domain: Medications
      7. A patient asks why her eye drops come in a small amber bottle. What is the BEST explanation?
      PTCE domain: Patient Safety and Quality Assurance
      8. A transdermal fentanyl patch is dispensed to a patient. Which storage instruction is MOST important to include on the label?
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