PTCB Guide to Corticosteroids

Also called glucocorticoids, steroids · suffix -sone, -solone, -onide · updated August 5, 2026

What gets tested

• Recognizing the stems: -sone and -solone for systemic agents, -onide for many inhaled and topical products
• Matching brand to generic: Medrol and Solu-Medrol are methylprednisolone, Deltasone is prednisone, Decadron is dexamethasone
• The Medrol Dose Pack and how a tapering schedule reads
• Why steroids are not stopped abruptly after prolonged use
• Counseling to take with food in the morning, and to rinse the mouth after an inhaled steroid
• The blood glucose effect and what it means for patients with diabetes

What is not tested

You are not expected to convert between steroid potencies, decide a taper schedule, or match a steroid to a disease. What matters is stem and brand recognition, the tapering principle, the dose pack format, and the counseling and monitoring points. Strengths, dosage forms, routes, special handling, and duration of therapy are covered by PTCE knowledge area 1.4, which makes the dose pack a very fair target for a question.

Why corticosteroids matter

Prednisone is among the most dispensed medications in the United States, and the Medrol Dose Pack is one of the most recognizable tapering packages a technician will hand across the counter. The class also carries a counseling point with real consequences: stopping a long course abruptly can precipitate an adrenal crisis, which makes it a genuine patient safety issue rather than a memorization exercise.

Corticosteroids at a glance

Mechanism of action

Corticosteroids are lipid-soluble, so they pass straight through the cell membrane rather than docking at a receptor on the surface. Inside the cell they bind the glucocorticoid receptor, and the drug and receptor together move into the nucleus and bind DNA at glucocorticoid response elements. From there they act as a transcription switch: they turn up production of anti-inflammatory proteins and turn down production of the inflammatory ones, including the cytokines and enzymes that drive swelling, redness, and immune recruitment. One important downstream effect is suppression of phospholipase A2, which sits upstream of both the prostaglandin and the leukotriene pathways. That is why steroids suppress inflammation more broadly than an NSAID, which blocks only the cyclooxygenase branch. Because the mechanism runs through gene transcription, the effect takes hours to appear rather than minutes, and it persists after the drug has cleared. The same receptor system explains the adverse effects: glucocorticoids also drive glucose production in the liver, break down protein and bone, redistribute fat, and retain sodium and water. Critically, the body senses circulating steroid and shuts down its own production through the hypothalamic-pituitary-adrenal axis. After roughly two weeks of meaningful dosing that shutdown is established, and abruptly removing the drug leaves the patient unable to produce cortisol, which is why the dose must be tapered.

Common and important side effects

• Raised blood glucose, which can destabilize diabetes or unmask it
• Increased appetite, weight gain, and fluid retention
• Insomnia, restlessness, irritability, and mood changes including euphoria or depression
• Increased susceptibility to infection, and masking of the usual signs of infection
• Osteoporosis and higher fracture risk with long-term use
• Stomach irritation and ulcer risk, especially alongside an NSAID
• Thinning skin, easy bruising, and slower wound healing
• Cataracts and raised eye pressure with prolonged use
• Adrenal suppression, and adrenal crisis if the drug is stopped abruptly
• Oral thrush with inhaled steroids if the mouth is not rinsed

Key interactions

• NSAIDs combined with corticosteroids substantially increase the risk of gastrointestinal ulceration and bleeding
• Live vaccines are generally avoided during immunosuppressive doses
• Diabetes medicines may need adjustment, because steroids raise blood glucose
• Strong CYP3A4 inhibitors raise steroid levels, and inducers such as rifampin and phenytoin lower them
• Warfarin response may change in either direction, so INR is monitored
• Combining with a potassium-wasting diuretic can deepen potassium loss

Patient counseling notes

• Take the dose in the morning with food, which matches the body's natural cortisol rhythm and reduces both stomach upset and insomnia
• Follow a tapering schedule exactly as written, and never stop a longer course suddenly
• Rinse the mouth with water and spit after using an inhaled corticosteroid, to prevent oral thrush
• Monitor blood glucose more closely if diabetic, because readings often rise during therapy
• Report signs of infection such as fever or sore throat, since steroids can blunt the usual warning signs
• Carry medical identification when on long-term therapy, so that stress dosing can be considered in an emergency
• Expect a Medrol Dose Pack to step the dose down day by day, and follow the card rather than taking a fixed daily amount

Practice questions

Work the Corticosteroids questions below first, then widen out. Two skills carry most of the Medications domain, and each has its own quiz. The first is drug class identification: recognising which class a drug belongs to from its name or its stem, which is what the drug class identification quiz drills across every class. The second is brand and generic recall, because the exam switches between the two names freely and expects you to follow. Pair this guide with the brand and generic quiz until the brand and generic pairs in the table above come back without effort.

Related drug-class guides

Official sources

• MedlinePlus: Prednisone
• MedlinePlus: Methylprednisolone
• MedlinePlus: Dexamethasone
• MedlinePlus: Hydrocortisone
• ClinCalc DrugStats: Prednisone (dispensing data)

PTCB Quiz Prep is an independent study resource, not affiliated with the Pharmacy Technician Certification Board. This guide is for exam preparation, not medical advice. Part of the PTCB Medications domain.