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Pharmacology · Corticosteroids (glucocorticoids)

Triamcinolone !

An intermediate-acting corticosteroid best known as a depot injection into joints, muscle or skin lesions, and as nasal spray and creams.

Updated 2026-11-01

The figure shows dexamethasone in the ligand-binding pocket of the human glucocorticoid receptor; triamcinolone acetonide, also a 9α-fluorinated steroid, binds the same pocket.

Target in 3D: Glucocorticoid receptor (GR), a nuclear receptor. PDB structure 1M2Z (RCSB PDB, public domain). View the structure at RCSB PDB

Mechanism of action

Triamcinolone acetonide binds the glucocorticoid receptor; the complex enters the nucleus, switches on anti-inflammatory genes and represses NF-κB and AP-1. As an injectable suspension, its poorly soluble crystals dissolve slowly at the injection site, so a single local injection keeps a high anti-inflammatory effect in the joint or lesion for weeks with lower systemic exposure. It has little salt-retaining effect.

  1. The injected crystals dissolve slowly at the site
  2. Triamcinolone binds the glucocorticoid receptor in local cells
  3. Inflammatory genes are repressed for weeks

Pharmacokinetics

Absorption
Depot suspension for intra-articular, intralesional or IM injection; also nasal, topical and dental-paste forms
Distribution
Released slowly from the injection site; some reaches the circulation and can suppress the adrenal axis
Half-life
Long local action after a depot injection

Indications

Adverse effects

Common

  • Pain or a flare of pain after joint injection
  • Skin thinning, loss of fat or colour at the injection site
  • Transient rise in blood glucose

Contraindications

  • Systemic fungal infections
  • Hypersensitivity to the product
  • Intravenous, epidural or intrathecal use of the suspension
  • Injection into an infected joint or site

Key interactions

Strong CYP3A4 inhibitors (ketoconazole, ritonavir)
Higher steroid exposure, with Cushing syndrome and adrenal suppression
Aspirin and other NSAIDs
Higher risk of gastrointestinal ulcer
Potassium-depleting diuretics and amphotericin B
Hypokalaemia

What is monitored

  • Signs of joint infection after injection (heat, redness, fever)
  • Blood glucose in people with diabetes
  • Signs of adrenal suppression with repeated injections

Administration and safety

  • The injectable suspension is not for IV, epidural or intrathecal use
  • Contains benzyl alcohol: not used in neonates
  • The vial is shaken to disperse the suspension; strict aseptic technique for joint injection

Nursing care

  • After a joint injection, teach the patient to report increasing pain, swelling, redness or fever
  • Check glucose in people with diabetes during the following days
  • Record the site and date of each injection, since repeated injections add up

Pregnancy and breastfeeding

Used in pregnancy only when the benefit justifies it; local injections give less fetal exposure than systemic doses.

Test yourself

Think of the answer, then tap the question to see it.

Why does a single intra-articular triamcinolone injection act for weeks?

Triamcinolone acetonide is a poorly soluble crystal suspension that dissolves slowly in the joint, keeping local levels high.

Why must triamcinolone suspension never be given intravenously?

It is a particulate depot suspension made for local or IM injection only; the label forbids IV, epidural and intrathecal use.

Which complication is ruled out before injecting a painful, swollen joint with a corticosteroid?

Septic arthritis: a corticosteroid injected into an infected joint worsens the infection.

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Educational content on how drugs work; not a prescribing guide and no substitute for a health professional's advice. No doses are given.

Sources: Triamcinolone Injection: MedlinePlus Drug Information (MedlinePlus (U.S. National Library of Medicine), 2025); DailyMed - TRIAMCINOLONE ACETONIDE injection, suspension (DailyMed (U.S. National Library of Medicine), 2026); ATCDDD - ATC/DDD Index (WHO Collaborating Centre for Drug Statistics Methodology, 2026).

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Representative model, for educational purposes only.