Myositis Treatment: Options and What to Expect

How is myositis treated?

Myositis (inflammation of the muscles) is usually a long-term autoimmune condition, which means the immune system mistakenly attacks the muscles. There is no cure yet, so treatment has three goals: calm that immune attack, protect and rebuild muscle strength, and keep symptoms under control — ideally reaching remission, where the disease goes quiet.

There is no single treatment that works for everyone. Your plan depends on the type of myositis, how severe it is, and whether the lungs, skin, or swallowing muscles are involved. Care is usually led by a rheumatologist or neurologist, often with a physical therapist and other specialists. Treatment is adjusted over time based on how you respond and on regular blood tests.

Corticosteroids: the usual first step

For most types of myositis, treatment begins with a corticosteroid such as prednisone. Steroids work quickly to reduce inflammation and quiet the overactive immune response, which often improves strength within weeks.

Because long-term, high-dose steroids can cause side effects — weight gain, thinning bones, higher blood sugar, and mood changes — doctors usually prescribe a higher dose at first and then slowly lower it as symptoms improve. Your care team may also recommend calcium, vitamin D, or bone-protecting steps along the way.

Immune-calming (steroid-sparing) medicines

To control the disease with less steroid over time, doctors often add a second medicine that calms the immune system. These are sometimes called steroid-sparing drugs because they let the steroid dose come down. Common options include:

• Methotrexate — a widely used weekly medicine that dampens the immune attack.
• Azathioprine — another common first choice to lower the steroid dose.
• Mycophenolate mofetil — often used, including when the lungs are involved.
• Tacrolimus or cyclosporine — calcineurin inhibitors used for harder-to-control disease.

These medicines take longer than steroids to work, and they require regular blood tests to watch for effects on the liver, kidneys, and blood counts.

IVIG and infusion therapies

When steroids and steroid-sparing medicines aren’t enough, or aren’t well tolerated, the next options are often given by infusion (through a vein):

• Intravenous immunoglobulin (IVIG). A concentrated mix of antibodies from healthy donors that helps regulate the immune system. IVIG (brand Octagam 10%) is FDA-approved for dermatomyositis and is also used off-label for other types. It can help both muscle weakness and the dermatomyositis skin rash.
• Rituximab. A medicine that targets certain immune cells (B cells), used mainly for cases that don’t respond to standard treatment.

As of 2026, there is no biologic drug approved specifically for myositis, but several are being studied — including JAK inhibitors, abatacept, and, in early research, CAR T-cell therapy. Anti-TNF drugs are generally not recommended for myositis.

Physical and occupational therapy

Medicine calms the disease, but rebuilding strength takes movement. Physical therapy and guided exercise are a core part of treatment. A physical therapist can design a safe program to restore strength and keep muscles flexible, which also helps reduce stiffness and future flares.

Occupational therapy helps with everyday tasks — dressing, cooking, writing — and can suggest tools or adjustments that make daily life easier, which is especially valuable for hand and grip weakness. For inclusion body myositis, which doesn’t respond well to immune medicines, exercise and physical therapy are considered the most useful tools for staying active.

Treating specific situations

• Dermatomyositis skin rash. Because sunlight can trigger it, daily sunscreen and sun-protective clothing are strongly recommended, along with other skin treatments your doctor may prescribe.
• Medication-related myositis. If a medicine (such as certain cholesterol-lowering statins) triggered the muscle inflammation, the first step is usually stopping that medicine under medical guidance. One rare statin-linked form needs ongoing immune treatment even after the statin is stopped.
• Infection-related myositis. When an infection is the cause, treatment targets the infection itself.
• Swallowing, breathing, or lung involvement. These need close monitoring and more intensive treatment, since they can be serious.