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3,4-Diaminopyridine for Lambert-Eaton Myasthenic Syndrome (LEMS) and Congenital Myasthenia (CM)

Expanded access is currently available for this treatment.
Verified April 2015 by Tessa L Marburger, Oregon Health & Science University
Jacobus Pharmaceutical
Information provided by (Responsible Party):
Tessa L Marburger, Oregon Health & Science University Identifier:
First received: December 11, 2013
Last updated: April 20, 2015
Last verified: April 2015

Lambert-Eaton Myasthenic Syndrome (LEMS) is a rare autoimmune disorder which affects the nerve-muscle junction. The major symptoms of LEMS are progressive muscle weakness. Many patients experience other symptoms like dry mouth or impotence. Congenital Myasthenia (CM) is an inherited disorder with similar affects and symptoms.

3,4-Diaminopyridine (DAP) is an experimental drug that has improved strength in some subjects with (LEMS). There are no other accepted treatments for LEMS and DAP has relatively few side effects.

Condition Intervention
Lambert-Eaton Myasthenic Syndrome (LEMS)
Congenital Myasthenia (CM)
Drug: 3,4-diaminopyridine

Study Type: Expanded Access     What is Expanded Access?
Official Title: 3,4-Diaminopyridine for Lambert-Eaton Myasthenic Syndrome and Congenital Myasthenia

Resource links provided by NLM:

Further study details as provided by Tessa L Marburger, Oregon Health & Science University:

Intervention Details:
    Drug: 3,4-diaminopyridine
    10mg tablets for up to 100mg per day
    Other Name: 3,4DAP
Detailed Description:
Subjects with clinically confirmed LEMS or CM will receive 3,4-diaminopyridine (3,4 DAP) by mouth in slowly increasing doses. Treatment will begin with 5-10 mg three times a day. A common final dosage is 15-20 mg four or five times a day, as clinically needed, and if tolerated. The upper limit is a total of 100 mg/day. Subjects will be monitored for strength and side effects via routine clinic visits at intervals of one month for the first three months, then every three months for the first year, and at least every six months thereafter. Treatment will be continued indefinitely if a good clinical response is achieved and side effects are tolerable.

Ages Eligible for Study:   2 Years and older   (Child, Adult, Senior)
Sexes Eligible for Study:   All

Inclusion Criteria:

  • Diagnosis of LEMS or CM
  • If female and over the age of 9, must have a negative pregnancy test, and, if premenopausal, must be willing to practice an effective form of birth control.
  • Must be tested and found by ECG not to have a prolonged Q-Tc syndrome.
  • Must agree to have a second ECG at the time of peak drug effect.

Exclusion Criteria:

  • Known to have sensitivity to 3,4-DAP
  • History of clinical seizures or evidence of seizure activity on screening EEG
  • History of severe asthma
  Contacts and Locations
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Please refer to this study by its identifier: NCT02012933

Contact: Diana Dimitrova, PhD 503-494-7269

United States, Oregon
Oregon Health & Science University
Portland, Oregon, United States, 97239
Contact: Diana Dimitrova, PhD    503-494-7269   
Principal Investigator: Tessa Marburger, MD         
Sub-Investigator: Julie Khoury, MD         
Sponsors and Collaborators
Tessa L Marburger
Jacobus Pharmaceutical
  More Information

Responsible Party: Tessa L Marburger, Assistant Professor, Oregon Health & Science University Identifier: NCT02012933     History of Changes
Other Study ID Numbers: Jacobus compassionate program
Study First Received: December 11, 2013
Last Updated: April 20, 2015

Keywords provided by Tessa L Marburger, Oregon Health & Science University:

Additional relevant MeSH terms:
Lambert-Eaton Myasthenic Syndrome
Myasthenic Syndromes, Congenital
Paraneoplastic Syndromes, Nervous System
Paraneoplastic Syndromes
Muscle Weakness
Pathologic Processes
Nervous System Neoplasms
Neoplasms by Site
Autoimmune Diseases of the Nervous System
Nervous System Diseases
Neurodegenerative Diseases
Neuromuscular Junction Diseases
Neuromuscular Diseases
Autoimmune Diseases
Immune System Diseases
Muscular Diseases
Musculoskeletal Diseases
Neuromuscular Manifestations
Neurologic Manifestations
Signs and Symptoms
Genetic Diseases, Inborn
Potassium Channel Blockers
Membrane Transport Modulators
Molecular Mechanisms of Pharmacological Action processed this record on May 25, 2017