Treatment for Lambert-Eaton Myasthenic Syndrome
Treatment for Lambert-Eaton myasthenic syndrome (LEMS) focuses on three key goals: treating any underlying cancer, improving nerve-muscle communication, and reducing the immune system’s attack on the body.
LEMS is typically managed by a neurologist, and treatment is tailored based on whether cancer is present, the severity of muscle weakness and other symptoms, and how quickly symptoms are progressing.
Treating the Underlying Cancer
If LEMS is linked to a cancer — most commonly small-cell lung cancer — treating the tumor is a critical first step and can also improve neurological symptoms.
Depending on the type and stage of cancer, treatment may include chemotherapy, radiation, surgery, or a combination of these approaches.
Medications to Improve Nerve-Muscle Communication
The most commonly used medication for LEMS is amifampridine (Firdapse), which increases the release of acetylcholine — the chemical that allows nerves and muscles to communicate.
This helps improve muscle strength and function and is considered first-line therapy, with many people experiencing meaningful improvement in symptoms.
Other medications may also be used, including:
- pyridostigmine (Mestinon), which helps prevent the breakdown of acetylcholine and may provide additional symptom relief, although it’s typically less effective than amifampridine when used alone
- guanidine, which can also enhance the release of acetylcholine but is used less often due to a higher risk of side effects
- pyridostigmine used alongside amifampridine to further improve muscle function
Immune-Modulating Treatments
Because LEMS is an autoimmune condition, treatments that target the immune system may be recommended, particularly for people with more severe or persistent symptoms.
These include:
- Corticosteroids (such as prednisone)
- Other immunosuppressive drugs (such as azathioprine or cyclosporine)
- Intravenous immunoglobulin (IVIG), which can help reduce harmful antibody activity and may provide temporary improvement in symptoms
These therapies aim to slow or suppress the immune system’s attack on the neuromuscular junction. Some of these medications can increase the risk of infections and may require ongoing monitoring.
Treatments for Severe Symptoms
In cases where symptoms are severe or rapidly worsening, more intensive treatments may be used.
- Plasma exchange (plasmapheresis), a procedure that removes harmful antibodies from the blood and can provide short-term relief
- High-dose immunoglobulin therapy, which may help stabilize symptoms during flares
These approaches are typically used for short-term management or in urgent situations.
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