Medications

Introduction

About a third of the PTCE is about medications — more than any other content area — because everything a technician does downstream — entering an order, catching an error, storing a vial, filling a controlled prescription — depends on knowing what the drug is, what class it belongs to, how it is formulated, and how dangerous it is if something goes wrong. This chapter builds the working vocabulary you use at the counter, in the IV room, and at the shelf. You are not being asked to be a pharmacist; you are being asked to recognize patterns quickly and accurately, because at retail volume you will touch hundreds of products a day and the recognition has to be automatic.

The single most useful idea in this whole chapter is that generic drug names are not random. They are engineered so the ending of the name tells you the class, which tells you the use, which tells you the typical side effects. Learn the stems and you have a shortcut into hundreds of drugs at once. The rest of the chapter is about the physical realities of those drugs: what form they come in, where and how cold they have to be stored, and which ones are so dangerous or so easily confused that the whole pharmacy is built to slow you down around them.

Generic and brand names

Every drug carries exactly one nonproprietary (generic) name, assigned through a formal process, but it may carry several proprietary (brand) names, because any number of manufacturers may market the same drug under names they own (USAN Council naming conventions). This one-to-many relationship is the source of a lot of exam questions and a lot of real-world confusion: a patient may know only "Lipitor" while your shelf and your screen say "atorvastatin," and you must match the two without hesitation.

The reason generic names are learnable is the class stem — a shared ending that signals the drug class. Memorize this short list and you can classify a drug you have never seen (USAN Council stem list):

• -pril → ACE inhibitors (blood pressure, heart failure)
• -sartan → angiotensin receptor blockers (ARBs)
• -olol → beta blockers
• -statin → cholesterol-lowering statins
• -azole → antifungals
• -cillin → penicillin antibiotics
• -prazole → proton pump inhibitors (PPIs) for acid

When a technician substitutes a generic for a brand, the substitution must be legitimate. The FDA publishes therapeutic equivalence codes in the Approved Drug Products with Therapeutic Equivalence Evaluations — the Orange Book — and only products rated therapeutically equivalent (the "A" codes) are considered substitutable for the brand. That rating is what makes generic substitution safe and legal, and it is why "it looks like the same drug" is not the standard; the code is.

Two cautions ride on top of this. First, some drugs have a narrow therapeutic index — the gap between an effective dose and a toxic one is small. Levothyroxine, warfarin, and phenytoin are the classic examples, and many states restrict switching the manufacturer of these products without notifying the prescriber or patient, because even a small change in absorption matters. Second, a combination product hides two or more active ingredients behind a single brand name, so you must confirm every component and its strength rather than trusting the brand name alone.

Worked example — classify from the stem. A prescription reads omeprazole 20 mg PO daily. You have never memorized omeprazole specifically. The ending -prazole tells you it is a proton pump inhibitor, so it reduces stomach acid, is taken for reflux/ulcers, and is generally taken before a meal. You have just derived the use and a counseling point from the name alone — which is exactly the skill the exam rewards.

Major drug classes and what they treat

Learning drugs by class lets you predict the indication, the counseling points, and the typical adverse effects, which is far more efficient than memorizing thousands of individual products. The classes below account for the bulk of retail and hospital volume, and each carries a signature side-effect pattern worth memorizing.

• Cardiovascular agents. ACE inhibitors, ARBs, beta blockers, calcium channel blockers, and diuretics lower blood pressure and treat heart failure; statins lower LDL ("bad") cholesterol to reduce cardiovascular risk.
• Anti-infectives. Penicillins, cephalosporins, macrolides, tetracyclines, and fluoroquinolones treat bacterial infections; antivirals and antifungals target their own organisms. Courses should be finished as directed even if the patient feels better.
• Endocrine and metabolic agents. Insulins (rapid-, short-, intermediate-, and long-acting), plus metformin, sulfonylureas, and GLP-1 agonists, manage diabetes; levothyroxine replaces thyroid hormone in hypothyroidism.
• Central nervous system agents. SSRIs and SNRIs treat depression and anxiety; benzodiazepines treat anxiety and seizures; opioids treat pain; anticonvulsants and antipsychotics manage seizure and psychiatric disorders.
• Gastrointestinal and respiratory agents. PPIs and H2 blockers reduce gastric acid; short-acting beta agonists are rescue inhalers, while inhaled corticosteroids are daily controllers in asthma.

The exam loves class-linked adverse effects, because they let it test whether you actually understand the class rather than just its name. Expect a dry cough with ACE inhibitors, constipation and sedation with opioids, hypoglycemia with insulin and sulfonylureas, muscle aches with statins, and photosensitivity (sunburn risk) with tetracyclines and fluoroquinolones. When a question gives you a side effect and asks for the likely culprit class, this list is usually the answer.

Dosage forms and routes of administration

The dosage form determines how fast and where a drug is absorbed, and it dictates the auxiliary labels you apply at dispensing. Mismatching form and route is a common, testable source of error.

Solid oral forms — tablets, capsules, caplets, and lozenges — are the most common. The critical rule: enteric-coated, delayed-release, and extended-release products must be swallowed whole. Crushing them destroys the release mechanism and can dump a whole day's dose at once. That is why "do not crush or chew" is a standard auxiliary label on these products.

Liquid forms differ by how the drug is dispersed. A solution is fully dissolved; a suspension contains undissolved particles and therefore needs a "shake well" label so each dose is uniform; an emulsion blends oil and water; syrups and elixirs are sweetened vehicles.

Parenteral routes — intravenous (IV), intramuscular (IM), subcutaneous (SUBQ), intradermal, and intrathecal — bypass the digestive tract. Because they bypass the body's normal barriers, they must be sterile and are compounded inside engineering controls that maintain ISO Class 5 air (USP <797>). Topical and transdermal forms include creams, ointments, gels, and lotions that act locally, and patches that deliver drug systemically over hours to days; patients should rotate sites and remove the old patch before applying a new one to avoid stacking doses. Inhalation and mucosal routes include metered-dose inhalers, dry-powder inhalers, and nebulizer solutions for the lungs; ophthalmic (eye) products must be sterile, and otic (ear) products must never be placed in the eye.

Finally, the route abbreviations appear on nearly every order and must be second nature:

Storage, handling, and stability

Storage conditions preserve potency, and the exam expects standard temperature ranges, not vague words like "cool." Memorize these exactly (USP <659>):

• Controlled room temperature: 20–25 °C (68–77 °F)
• Refrigeration: 2–8 °C (36–46 °F)
• Freezer: generally −25 to −10 °C

Several handling rules follow from stability. Light-sensitive drugs must be dispensed in light-resistant containers or kept in the original carton, with an auxiliary label to protect from light. Refrigerated products such as vaccines and biologics ride a cold chain with documented temperature logs; any excursion outside range means you quarantine the stock and contact the manufacturer before using it — you do not simply put it back. Insulin is the classic example of product-specific dating: unopened insulin stays refrigerated until its labeled expiration, while an in-use vial or pen is typically kept at room temperature for a limited number of days — read the manufacturer's labeling for the exact number rather than assuming (FDA-approved product labeling). Controlled substances (Schedules II–V) must be stored in a securely locked, substantially constructed cabinet or dispersed throughout the non-controlled stock to deter theft (21 CFR 1301.75).

The most tested dating distinction is expiration date versus beyond-use date (BUD). The manufacturer sets an expiration date for the unopened original container. The pharmacy assigns a shorter beyond-use date whenever a product is repackaged, reconstituted, or compounded (USP <795>). The BUD is always the pharmacy's responsibility and is always shorter than or equal to the manufacturer's date.

Look-alike/sound-alike and high-alert medications

Two categories drive most of the safeguards built into pharmacy workflow, and the technician is the first line of defense against both.

Look-alike/sound-alike (LASA) pairs are drugs confused because their names look or sound similar. Classic confused pairs include hydralazine and hydroxyzine, prednisone and prednisolone, cefazolin and ceftriaxone, and clonidine and clonazepam (ISMP List of Confused Drug Names). The defense against these is tall man lettering — mixed-case spelling such as hydrALAZINE and hydrOXYzine that highlights the differing letters so the eye catches the distinction on labels, shelf tags, and screens (FDA Name Differentiation Project) — plus physical separation so confusable products are not stored side by side, backed by shelf stickers or system prompts.

High-alert medications are a different problem: they are not necessarily easy to confuse, but they cause severe harm whenever an error does reach the patient. The heavily tested list is insulins; anticoagulants such as heparin and warfarin; opioids; concentrated electrolytes including potassium chloride; chemotherapy agents; and neuromuscular blockers (ISMP List of High-Alert Medications). Because the consequences are so serious, high-alert preparations should get an independent double check — a second qualified person verifies the drug, concentration, dose, and calculation without seeing the first person's work, so the second check is truly independent.

Finally, watch for clinically significant interactions the exam favors: warfarin with NSAIDs or certain antibiotics (bleeding), statins with strong enzyme inhibitors (muscle toxicity), several serotonergic drugs together (serotonin syndrome), and opioids plus benzodiazepines (additive, dangerous sedation).

Key numbers & facts — Medications

Common traps — Medications

• One generic, many brands — never the reverse. A drug has exactly one generic name; a brand name can hide a combination of ingredients. Confirm every component of a combination product.
• Substitution needs an "A" code, not a resemblance. Only Orange Book therapeutically-equivalent products are substitutable.
• Extended-/delayed-release and enteric-coated products are swallowed whole — never crush. Suspensions get "shake well."
• Otic vs. ophthalmic. Ear drops are not sterile-eye products; an eye product may be used in the ear, but an ear product must never go in the eye.
• Temperature ranges are exact. Refrigeration is 2–8 °C, not "the fridge, roughly." Room temperature is 20–25 °C.
• Tall man lettering is a visual cue, not a drug change — hydrALAZINE is still hydralazine; the capitals only flag the confusable letters.
• High-alert ≠ hard to confuse. Insulin and heparin are high-alert because errors are catastrophic, even though the names are not tricky.