Lesson · 24 min

Pharmacology Basics for Medical Assistants

Learn drug naming, common classifications, and routes of administration well enough to work safely with medications.

By the end of this lesson you can

Distinguish generic, brand, and chemical drug names
Name the major drug classifications and what they treat
Describe the common routes of administration
Identify high-alert medications requiring extra caution

📘 Reading Lesson

Lesson Notes

Read through the key concepts before you try the challenge.

Names, classes, and routes

On the job

You reconcile a medication list at Lakeside Medical Associates.

A patient lists both Lipitor and atorvastatin. These are the same drug under two names, and the list as written suggests they are taking a double dose. Somebody has to notice, and the person taking the list is the one positioned to.

Your task: Learn drug naming well enough to catch duplications and errors in a medication list.

Name type	Example	Note
Chemical	Long structural name	Rarely used clinically
Generic	atorvastatin	One per drug; conventionally lowercase
Brand	Lipitor	Several possible; conventionally capitalized

Three names for one drug

One generic drug may have several brand names, and patients frequently list both. Duplicate therapy — the same drug taken twice under different names — is a real and common cause of harm, and medication reconciliation is where it is caught.

Class	Treats	Example generic
Analgesics	Pain	acetaminophen, ibuprofen
Antibiotics	Bacterial infection	amoxicillin, azithromycin
Antihypertensives	High blood pressure	lisinopril, amlodipine
Statins	High cholesterol	atorvastatin, simvastatin
Antidiabetics	Diabetes	metformin, insulin
Bronchodilators	Asthma, COPD	albuterol
Anticoagulants	Clot prevention	warfarin, apixaban
Antidepressants	Depression, anxiety	sertraline, fluoxetine

Common drug classifications

Route	Abbreviation	Means
Oral	PO	By mouth
Sublingual	SL	Under the tongue
Topical	—	Applied to the skin
Intramuscular	IM	Into muscle
Subcutaneous	SubQ / SC	Into the tissue beneath the skin
Intradermal	ID	Between skin layers — TB testing, allergy testing
Intravenous	IV	Into a vein — generally outside MA scope
Inhalation	—	Breathed in
Rectal	PR	Into the rectum

Routes of administration

Certain abbreviations are on the Institute for Safe Medication Practices' do-not-use list because they are repeatedly misread with serious consequences — U for units (mistaken for a zero), QD for daily (mistaken for QID, four times daily), and a trailing zero such as 1.0 mg (misread as 10 mg). Write the word out. This is not pedantry; each of these has a documented history of patient deaths.

High-alert medications carry a heightened risk of significant harm when used in error — insulin, anticoagulants, opioids, and concentrated electrolytes among them. They are not more likely to be involved in an error; the consequences when they are are far worse. Practices typically require independent double-checks for these, and the check is worth taking seriously rather than initialling.

Check your understanding

A patient's medication list includes both Lipitor and atorvastatin. What should you do?

Challenge

Apply what you've learned in this lesson.

Medication knowledge builds through repeated exposure.

For each brand name, find the generic: Lipitor, Norvasc, Zestril, Glucophage, Zoloft, Ventolin.
Find the ISMP list of error-prone abbreviations. Write out five and what each is mistaken for.
Research the ISMP high-alert medication list for ambulatory settings. Name four and say why each is high-alert.
For a medication list containing eight drugs you invent, identify any duplications by class and explain what you would flag.

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