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Oral antidiabetics and corticosteroids

NCLEX endocrine meds chapter: metformin and hypo risk by class, sulfonylurea teaching, steroid glucose and infection traps, and taper rules.

Clesial Editorial TeamReviewed by Clesial Editorial Team, Clinical Content Review

4 minUpdated Aug 6, 2026
Contents6 sections

Endocrine drug stems split into insulin emergencies and everything else that still moves glucose and cortisol. DKA, HHS, and insulin peaks live in Diabetes and glycemic emergencies. Addison versus Cushing disease pictures live in Thyroid and adrenal disorders. This chapter owns oral/non-insulin antidiabetics and corticosteroid therapy teaching.

Oral and non-insulin antidiabetics

Type 2 regimens often start with drugs that cut hepatic glucose output, squeeze out insulin, or spill glucose in urine. Your exam job is matching class to the danger: who hypoglycemias, who fails with bad kidneys, who needs holding for contrast or surgery.

Class (exam view)High-yield trap
Metformin (biguanide)Hold for contrast/renal failure risk; lactic acidosis cues; GI SE
SulfonylureasHypoglycemia — meals matter; caution in elders
DPP-4 / GLP-1 (as tested)Pancreatitis cues / GI SE; GLP-1 injection teaching when present
SGLT2 inhibitorsYeast infections; volume depletion; sick-day hold patterns

Metformin does not usually cause hypoglycemia alone, which is why stems love it — but renal impairment and iodinated contrast protocols require holds and restart rules as ordered. Teach clients not to restart on their own after a scan until the provider clears creatinine. Sulfonylureas can drop glucose hard; pair teaching with the same hypo recognition used for insulin.

  1. Know which drug can cause hypo before the meal tray is late.
  2. Hold metformin per contrast/renal protocol — document the hold.
  3. Sick-day rules still apply: check glucose, hydrate, know when to call.

Corticosteroids

Glucocorticoids (prednisone, methylprednisolone, dexamethasone, and kin) are anti-inflammatory and immunosuppressive. They also raise blood glucose by opposing insulin, so diabetics need more monitoring and often more antidiabetic therapy while on steroids. Infection risk rises — fever is a call-now finding, not a shrug. Skin thins, wounds slow, mood can lift or crash, appetite and sodium retention climb, and long-term use risks osteoporosis.

Safety

Chronic steroid users who stop suddenly can tip into adrenal insufficiency — taper only as ordered; stress dosing may be needed when sick.

Administration tips that appear on exams: give in the morning when ordered to mimic diurnal rhythm and reduce insomnia, take with food if GI upset, never share doses, and carry medic-alert if adrenal-dependent. Topical and inhaled steroids have less systemic load but still need technique teaching (rinse after inhaled steroids to cut thrush) — systemic stems are where glucose and taper rules dominate.

ProblemNursing angle
Hyperglycemia on prednisoneMonitor glucose; expect adjusted diabetes plan
Fever / sore woundInfection risk — escalate early
Sudden stop after monthsAdrenal crisis risk — do not advise cold turkey
Mood / insomniaMorning dosing when ordered; safety if agitated
  • Live vaccines may be restricted on significant immunosuppression — follow orders.
  • Blood pressure and weight trends catch fluid retention.
  • Link back to Addison crisis teaching if the client is steroid-dependent.

Priority map

SituationFirst move
Metformin + upcoming contrast CTHold per protocol; check restart rules
Sulfonylurea + skipped meal + sweatTreat hypo
New high sugars on prednisoneMonitor; notify for plan adjust
Client stops chronic prednisone coldUrgent provider notify — adrenal risk
Steroid client with feverEscalate — immunosuppression

Revision

Must know

  1. 1Insulin timing, DKA/HHS, and hypo rescue live in Diabetes and glycemic emergencies — this chapter owns non-insulin antidiabetics and systemic steroids.
  2. 2Metformin: GI upset common; hold around iodinated contrast as protocol; lactic acidosis risk with renal failure / hypoxia — report muscle pain, malaise, hyperventilation patterns.
  3. 3Sulfonylureas / meglitinides: can cause hypoglycemia — teach meals and hypo treatment.
  4. 4SGLT2 inhibitors (as tested): genital infection and dehydration/DKA-like risk teaching; hold in acute illness per orders.
  5. 5Corticosteroids raise glucose, suppress immunity, thin skin, cause mood/sleep change, and risk adrenal suppression with chronic use.
  6. 6Never stop chronic steroids abruptly — taper as ordered to avoid adrenal crisis.
  7. 7Take steroids with food if GI upset; report fever early; monitor glucose in diabetics.
  8. 8Addison replacement stress dosing overlaps adrenal teaching in Thyroid and adrenal disorders.

Memory hooks

  • Metformin meets contrast carefully

    Hold around iodinated contrast per protocol and watch renal function — lactic acidosis is the feared rare event.

  • Steroids: sugar up, germs in, taper slow

    Expect hyperglycemia and infection risk; never cold-turkey chronic therapy.

How it's tested

Stems ask when to hold metformin for a CT with contrast, which oral agent causes hypo, why prednisone makes glucose climb, or what happens if chronic steroids stop suddenly. Distractors stop steroids cold, promise metformin cannot cause problems with contrast, or treat steroid fever as unimportant.

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