May 22, 2017
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Discontinued Warning IconPlease Note: This Brand Name drug is no longer available in the US.
(Generic versions may still be available.)

Enlon Patient Information Including Side Effects

Brand Names: Enlon, Tensilon

Generic Name: edrophonium (Pronunciation: ED roe FOE nee um)

What is edrophonium (Enlon)?

Edrophonium is used as part of a medical test to help diagnose a muscle disorder called myasthenia gravis.

Edrophonium is sometimes used to reverse the effects of certain medications used to prevent muscle contractions during surgical procedures.

Edrophonium may also be used for other purposes not listed in this medication guide.

What are the possible side effects of edrophonium (Enlon)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Tell your caregivers at once if you have a serious side effect such as:

  • slow heart rate;
  • chest pain, weak pulse, increased sweating, and dizziness;
  • feeling like you might pass out;
  • weak or shallow breathing;
  • urinating more than usual;
  • seizures (convulsions); or
  • trouble swallowing.

Less serious side effects (some of which can be expected as part of a positive test reaction) may include:

  • watery eyes, vision problems;
  • changes in your voice;
  • mild nausea, vomiting, diarrhea, stomach pain;
  • weakness; or
  • muscle twitching.

This is not a complete list of side effects and others may occur. Tell your doctor about any unusual or bothersome side effect. You may report side effects to FDA at 1-800-FDA-1088.

Read the Enlon (edrophonium injection) Side Effects Center for a complete guide to possible side effects

What is the most important information I should know about edrophonium (Enlon)?

You should not receive this medication if you are allergic to edrophonium, or have a blockage in your intestines or obstructed urine flow.

Before you receive edrophonium, tell your doctor if you have asthma, a heart rhythm disorder, or if you are allergic to sulfites. Also tell your doctor if you are pregnant or breast-feeding.

Tell your caregivers at once if you have a serious side effect such as slow heart rate, chest pain, weak pulse, fainting, weak or shallow breathing, increased urination, seizures, or trouble swallowing.

Less serious side effects may occur (some of which can be expected as part of a positive test reaction to edrophonium) such as watery eyes, vision problems, changes in your voice, mild nausea, vomiting, stomach pain, weakness, or muscle twitching.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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