Medicine for Myasthenia Gravis

Reviewed by: HU Medical Review Board | Last reviewed: June 2022 | Last updated: November 2022

Myasthenia gravis (MG) is a chronic autoimmune disorder. MG causes certain muscles to become weak, especially after you use them. There is no cure for MG, but there are drugs to help treat its symptoms.

Sometimes MG symptoms can be unpredictable. Each person’s case can be quite different from the next person’s. This means there is no single treatment or drug that will help everyone who has MG.1

Your doctor’s goals when prescribing you medicines for MG will be to help control your symptoms and improve your quality of life. They will also want to use the lowest drug doses possible to reach those goals. Some people with MG find that their symptoms disappear, or go into remission, for at least some time during treatment.

Types of drugs used

A few medicines, alone or in combination, can help relieve MG symptoms. The best treatment for you will depend on:1,2

  • Your age
  • How severe your MG is
  • What side effects you have from the drug or drugs
  • Whether you are pregnant
  • The type of antibodies your body produces

Main treatments for MG

Acetylcholinesterase inhibitors are a type of fast-acting drug that improves nerve signals to the muscles. Pyridostigmine (Mestinon®) is the medicine most often prescribed.1,2

Steroids (corticosteroids) are a type of hormone used to control MG symptoms quickly. Steroids are used when acetylcholinesterase inhibitors are not enough to control symptoms. Doctors try to avoid long-term, high doses of steroids because these drugs can have many side effects. Prednisone is most often prescribed.1,2

Immunotherapies are prescribed in moderate to severe MG as an alternative to high doses of steroids or when steroids are not working. Depending on what you need, immunotherapies can make your immune system:1,2

  • Less active (immunosuppressants)
  • Act differently (immunomodulators)

Biologics are a type of drug made from living organisms. These drugs also help suppress the immune system. Different biologics are used depending the type of MG you have:1-4

  • Eculizumab (Soliris®) is used to treat refractory MG with anti-acetylcholine receptor (AChR) antibodies
  • Rituximab (Rituxan®) is used to treat refractory MG with muscle-specific kinase antibodies
  • Ravulizumab-cwvz (Ultomiris®) is used to treat generalized MG with AChR antibodies

Special considerations

If you are trying to get pregnant or already are pregnant, your doctor may need to change or add to some of the medicines you take in order to support a healthy pregnancy.

People with MG must also be careful about the other prescription drugs and supplements they take. Some commonly prescribed medicines make MG symptoms worse, such as beta-blockers and some antibiotics and anesthetics.1

Other treatments

Other treatments for MG may include:1

  • Surgery to remove your thymus gland (thymectomy)
  • Plasma exchange (PLEX)
  • Intravenous immunoglobulin (IVIG)

Your doctor will also recommend several lifestyle changes. They may also recommend other medicines to improve your quality of life and treat side effects of MG drugs:1-4

  • Antidepressant and antianxiety medicines, which can help improve and regulate your mood if MG is also causing you mental health challenges.
  • Antidiarrheal medicines, which may be prescribed to help manage one of the side effects of acetylcholinesterase inhibitors.
  • Bisphosphonates, calcium, and vitamin D, supplements that may be needed to help manage osteoporosis or weakening of the bones caused by steroids.

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