RUZURGI is a prescription medicine used to treat Lambert-Eaton myasthenic syndrome (LEMS) in children 6 to less than 17 years of age. It is not known if it is safe or effective in children less than 6 years of age.

Side Effects Of Ruzurgi

Serious allergic reactions, such as anaphylaxis. RUZURGI can cause serious allergic reactions. Stop taking it and call your doctor right away or get emergency medical help if you have:

  • shortness of breath or trouble breathing
  • swelling of your throat or tongue
  • hives

The most common side effects of RUZURGI include:

  • tingling around the mouth, tongue, face, fingers, toes, and other body parts
  • stomach pain
  • indigestion
  • dizziness
  • nausea

Tell your doctor if you have any side effect that bothers you or does not go away.

  • These are not all the possible side effects of RUZURGI.
  • Call your doctor for medical advice about side effects

Warnings & Precautions

Do not take RUZURGI if you:

  • have ever had a seizure.
  • are allergic to amifampridine or another aminopyridine. Talk to your doctor if you are not  sure.

Before you take RUZURGI, tell your doctor about all of your medical conditions including if you:

  • are taking another aminopyridine, such as compounded 3,4-diaminopyridine (3,4-DAP)
  • 4-aminopyridine, or pyridostigmine.
  • have had a seizure.
  • have kidney problems.
  • have liver problems.
  • are pregnant or planning to become pregnant. It is not known if RUZURGI can harm your unborn baby. You and your doctor should decide if you will take it while you are pregnant.
  • are breastfeeding or plan to breastfeed. It is not known if it passes into your breastmilk. Talk to your doctor about the best way to feed your baby while taking RUZURGI.

Tell your doctor about all the medicines you take, including prescription and over-the-counter medicines, vitamins, and herbal supplements.

Dosage Of Ruzurgi

Take RUZURGI exactly as your doctor tells you to take it. Do not change your dose of RUZURGI. Do not stop taking it without first talking to your doctor. RUZURGI tablets are scored and can be cut if less than a full tablet is needed for you to get the right dose. It can be taken with or without food. If you miss a dose, skip that dose and take your next dose at your next scheduled dose time.

Do not take RUZURGI together with other medicines known to increase the risk of seizures such as aminopyridine medicines, including:

  • compounded 3,4-diaminopyridine (amifampridine)
  • amifampridine phosphate
  • 4-aminopyridine

If you take too much, call your doctor or go to the nearest hospital emergency room right away.


Medicines are sometimes prescribed for purposes other than those listed in a Medication Guide. Do not use RUZURGI for a condition for which it was not prescribed. Do not give it to other people, even if they have the same symptoms that you have. It may harm them. If you would like more information, talk with your doctor or pharmacist. You can ask your pharmacist or doctor for information about RUZURGI that is written for health professionals.


All information has been provided courtesy of MedLinePlus from the National Library of Medicine and from the FDA.