How Long Does a Steroid Shot Take to Work?

Quick Answer

A cortisone (steroid) injection typically begins working within 1–3 days, with maximum pain relief reached at 1–2 weeks. The effects last anywhere from 6 weeks to 6 months depending on the condition treated, the injection site, and individual response. Some people feel immediate relief from the local anesthetic mixed into the injection, but the steroid itself takes time to reduce inflammation.

Onset Timeline

Phase	Timeframe	What to Expect
Injection day	0–24 hours	Numbness from local anesthetic; possible post-injection flare
Early relief	1–3 days	Anesthetic wears off; steroid begins reducing inflammation
Peak effect	7–14 days	Maximum pain relief and reduced swelling
Duration of relief	6 weeks–6 months	Gradual return of symptoms varies by condition

How Long Relief Lasts by Injection Site

Injection Site	Typical Duration of Relief	Common Conditions Treated
Knee	6 weeks–3 months	Osteoarthritis, meniscus tears
Shoulder	4–8 weeks	Rotator cuff tendinitis, bursitis, frozen shoulder
Lower back (epidural)	2 weeks–3 months	Herniated disc, spinal stenosis, sciatica
Hip	6 weeks–3 months	Bursitis, osteoarthritis
Wrist/hand	4–6 weeks	Carpal tunnel syndrome, trigger finger
Foot/heel	3–6 months	Plantar fasciitis, Morton’s neuroma

Types of Corticosteroids Used

Not all steroid injections are the same. The specific drug affects how quickly it works and how long it lasts.

Corticosteroid	Onset	Duration	Common Use
Dexamethasone	1–2 days	2–4 weeks	Soft tissue, joints
Methylprednisolone (Depo-Medrol)	1–3 days	4–8 weeks	Joints, bursae
Triamcinolone (Kenalog)	2–3 days	6–12 weeks	Joints, epidural
Betamethasone (Celestone)	1–2 days	4–8 weeks	Joints, soft tissue

The Post-Injection Flare

About 10–20% of patients experience a "cortisone flare" – increased pain and swelling at the injection site – within the first 24–48 hours. This is caused by the crystalline structure of the steroid irritating the tissue. It typically resolves within 2–3 days and can be managed with ice and over-the-counter pain relievers.

Risks of Repeated Injections

Most doctors limit cortisone injections to 3–4 per year in the same location because repeated use can cause:

• Cartilage damage: Accelerated joint degeneration with frequent injections
• Tendon weakening: Increased risk of tendon rupture
• Skin changes: Thinning or lightening of skin at the injection site
• Blood sugar spikes: Temporary increase in blood glucose (important for diabetics)
• Infection: Small risk (~1 in 10,000) of joint infection

When to Call Your Doctor

• No improvement after 2 weeks
• Severe pain that worsens rather than improves
• Signs of infection: redness, warmth, swelling, fever
• Pain relief lasting less than 2 weeks (may indicate a different underlying condition)

Tips for Best Results

• Rest the injected joint for 24–48 hours after the injection
• Apply ice for 15–20 minutes several times on the first day
• Avoid strenuous activity for at least 48 hours
• Follow up with physical therapy for longer-lasting results
• Keep a symptom diary to track how long relief lasts, which helps your doctor plan future treatment