If it is caused by a bacterial infection, antibiotics can be used. If myositis is being caused by a medication, it is important to stop that medication.There are a variety of treatment options available if myositis is caused by an autoimmune disease. Glucocorticoids are often the first choice for treatment. This drug works to weaken your immune system so that your immune system is not able to attack your muscles. This is a type of steroid and can cause a wide array of side effects such as mood changes, increased hunger, trouble sleeping, etc. Another treatment option is a steroid-sparing immunosuppressive agent. This works to also weaken your immune system, but does not cause the side effects that the steroids do. Yet another treatment option is a class of drugs called biologics. Also, intravenous immunoglobulins (IVIg) has also been shown to be effective in the treatment of myositis caused by an autoimmune disease. See also
Myopathy (muscle disease)
Myalgia (muscle pain)
Masticatory muscle myositis (a disease in dogs)
Perimyositis

References
External links
Myositis: NIH

Myositis Association https://www.myositis.org
Hydralazine with nitrates may replace ACE-I in breastfeeding mothers or before delivery; however, evidence suggests that this course of treatment may not be as effective as ACE-I but beneficial when necessary.If EF is less than 35%, anticoagulation is indicated, as there is a greater risk of developing left ventricular thrombi (blood clots). Sometimes implantation of a left ventricular assist device (LVAD) or even heart transplant also becomes necessary.It is important that the patient receives regular follow-up care including frequent echocardiograms to monitor improvement or the lack thereof, particularly after changes of medical treatment regimes. Patients who do not respond to initial treatment, defined as left ventricular EF remaining below 20% at two months or below 40% at three months with conventional treatment may merit further investigation, including cardiac magnetic resonance imaging (MRI), cardiac catheterization, and endomyocardial biopsy for special staining and for viral polymerase chain reaction (PCR) analysis. Antiviral therapy, immunoabsorption, intravenous gamma globulin, or other immunomodulation therapy may then be considered accordingly, but following a controlled research-type protocol.Since no one knows for sure exactly when to discontinue treatment, even when recovery occurs quickly, it is still recommended that both ACE-I and B-B be continued for at least one year after diagnosis.PPCM patients have an increased risk for sudden death and it is seen that they benefit from implantable cardioverter defibrillator (ICD) and cardiac resynchronization therapy to prevent sudden cardiac death.