What You Should Know About Depo-Medrol Side Effects

If your doctor has recommended a Depo-Medrol injection, it's natural to wonder about side effects. Depo-Medrol (Methylprednisolone Acetate) is a corticosteroid injection used to treat inflammation from arthritis, bursitis, allergies, and many other conditions. Like all medications, it can cause side effects — most are mild and temporary, but some are serious enough to need immediate medical attention.

This guide covers the most common side effects, the serious ones to watch for, and when you should contact your doctor.

What Is Depo-Medrol?

Depo-Medrol is an injectable form of Methylprednisolone Acetate, a synthetic corticosteroid made by Pfizer. It works by suppressing inflammation and the immune response in your body. It's given by injection — into a joint, muscle, or soft tissue — by a healthcare provider in a clinical setting. It is not a controlled substance.

Common Side Effects

Most people tolerate Depo-Medrol injections well. The following side effects are relatively common and usually resolve on their own within a few days:

• Injection site pain or swelling — The most common complaint. Some soreness or redness at the injection site is normal and usually fades within 24-48 hours.
• Headache — Mild headaches may occur after the injection.
• Nausea — Some patients feel mildly nauseated.
• Dizziness — Lightheadedness can happen, especially shortly after the injection.
• Insomnia — Corticosteroids can make it harder to fall asleep for a day or two after the injection.
• Increased appetite — You may feel hungrier than usual.
• Sweating — Increased sweating, including facial flushing, is common and usually temporary.
• Acne — Breakouts may occur, particularly with higher doses or repeated injections.
• Skin thinning at the injection site — The skin around the injection area may become thinner or lighter in color. This is more common with repeated injections in the same spot.
• Elevated blood sugar — Corticosteroids can temporarily raise blood sugar levels. This is especially important for people with diabetes.
• Mood changes — Some people experience irritability, restlessness, or mild mood swings.

Serious Side Effects

Serious side effects are less common but require immediate medical attention. Call your doctor right away or go to the emergency room if you experience:

• Anaphylaxis or severe allergic reaction — Signs include difficulty breathing, swelling of the face, lips, tongue, or throat, hives, and rapid heartbeat. This is a medical emergency.
• Signs of infection — Fever, chills, persistent redness, warmth, or swelling at the injection site. Corticosteroids suppress the immune system, which can increase your risk of infections.
• Severe mood disturbances or psychosis — While mild mood changes are common, severe anxiety, depression, confusion, or hallucinations require immediate medical attention.
• Vision changes — Blurred vision, eye pain, or seeing halos around lights may indicate cataracts or glaucoma, both of which can develop with long-term corticosteroid use.
• Bone pain — Unexplained hip, knee, or joint pain may be a sign of avascular necrosis (death of bone tissue due to reduced blood supply). This is rare but serious.
• GI bleeding — Black, tarry stools, vomiting blood, or severe stomach pain may indicate peptic ulcers or gastrointestinal bleeding, especially if you also take NSAIDs or blood thinners.
• Adrenal suppression symptoms — Extreme fatigue, weakness, dizziness, weight loss, or fainting. Repeated or high-dose corticosteroid use can suppress your body's natural cortisol production.
• Tendon rupture — Sudden pain, swelling, or loss of movement in a tendon area (especially the Achilles tendon).

Specific Populations at Higher Risk

Certain groups need extra caution with Depo-Medrol:

Pregnant or Breastfeeding Women

Depo-Medrol is Pregnancy Category C, meaning it may harm the fetus. It should only be used during pregnancy if the benefit clearly outweighs the risk. Methylprednisolone passes into breast milk, so nursing mothers should discuss this with their doctor.

People With Diabetes

Corticosteroids raise blood sugar levels. If you have diabetes, monitor your blood sugar more closely for several days after the injection and contact your doctor if levels stay elevated.

Children

Pediatric patients may be at risk for growth suppression with prolonged corticosteroid use. Growth should be monitored in children receiving repeated injections.

Older Adults

Elderly patients are at higher risk for osteoporosis, adrenal suppression, and infections. Doctors may use lower doses or longer intervals between injections for older patients.

Neonates

Depo-Medrol formulations containing benzyl alcohol should not be used in neonates due to the risk of serious toxicity.

How to Manage Common Side Effects

Here are some practical tips for dealing with the most common side effects:

• Injection site pain — Apply ice to the area for 15-20 minutes several times in the first 24 hours. Over-the-counter Acetaminophen (Tylenol) can help with pain. Avoid applying heat.
• Insomnia — If you have trouble sleeping, ask your doctor about scheduling the injection earlier in the day. Avoid caffeine in the afternoon and evening.
• Elevated blood sugar — If you have diabetes, check your blood sugar more frequently for 3-5 days after the injection. Have a plan with your doctor for adjusting your diabetes medication if needed.
• Mood changes — Let your family or household members know you might feel more irritable than usual for a few days. If mood changes become severe, contact your doctor.
• Increased appetite — Be mindful of your food choices. Stock up on healthy snacks to avoid overeating calorie-dense foods.

Final Thoughts

Most Depo-Medrol side effects are mild and go away on their own within a few days. The benefits of the injection — especially for people dealing with painful inflammation — usually outweigh the risks. But it's important to know what to watch for so you can act quickly if something doesn't feel right.

Always tell your doctor about your full medical history and all medications you're taking before getting a Depo-Medrol injection. And if you're having trouble finding Depo-Medrol due to the current shortage, Medfinder can help you locate it near you.