Skip to Content


Generic Name: Metreleptin (met re LEP tin)
Brand Name: Myalept

Medically reviewed by Last updated on Aug 12, 2020.


  • Some people who use Myalept (metreleptin) make antibodies in their blood. These may lower how well a hormone (leptin) in the body works. They may also lower how well Myalept (metreleptin) works. Side effects may also happen. These could be infection, problems with blood sugar like diabetes, and raised fats in the blood. Talk with the doctor.
  • A certain type of lymphoma has happened in people with this health problem. This has happened in people both treated and not treated with Myalept (metreleptin). Tell your doctor if you have ever had any immune system or bone marrow problems. Talk with your doctor.

Uses of Myalept:

  • It is used to treat problems caused by not having enough of a certain hormone (leptin) in the body. It is only for use in people with congenital or acquired generalized lipodystrophy.

What do I need to tell my doctor BEFORE I take Myalept?

  • If you are allergic to Myalept (metreleptin); any part of Myalept (metreleptin); or any other drugs, foods, or substances. Tell your doctor about the allergy and what signs you had.
  • If your health problem is not caused by not having enough leptin in your body.

This is not a list of all drugs or health problems that interact with Myalept (metreleptin).

Tell your doctor and pharmacist about all of your drugs (prescription or OTC, natural products, vitamins) and health problems. You must check to make sure that it is safe for you to take Myalept (metreleptin) with all of your drugs and health problems. Do not start, stop, or change the dose of any drug without checking with your doctor.

What are some things I need to know or do while I take Myalept?

  • Tell all of your health care providers that you take Myalept (metreleptin). This includes your doctors, nurses, pharmacists, and dentists.
  • Have blood work checked as you have been told by the doctor. Talk with the doctor.
  • Follow the diet plan that your doctor told you about.
  • Do not stop taking Myalept (metreleptin) all of a sudden without calling your doctor. You may have a greater risk of side effects. If you need to stop Myalept (metreleptin), you will want to slowly stop it as ordered by your doctor.
  • If you have had an autoimmune disease your sign may get worse. Talk with your doctor.
  • This medicine may lower your blood sugar levels. The chance may be raised if you also take insulin or other drugs that lower blood sugar. Talk with your doctor.
  • Check your blood sugar as you have been told by your doctor.
  • Some fluids used to mix Myalept (metreleptin) have benzyl alcohol. Do not give a product that has benzyl alcohol in it to a newborn or infant. It may cause very bad and sometimes deadly side effects. Talk with the doctor to see which fluids have benzyl alcohol.
  • Tell your doctor if you are pregnant, plan on getting pregnant, or are breast-feeding. You will need to talk about the benefits and risks to you and the baby.

How is this medicine (Myalept) best taken?

Use Myalept (metreleptin) as ordered by your doctor. Read all information given to you. Follow all instructions closely.

  • It is given as a shot into the fatty part of the skin on the top of the thigh, belly area, or upper arm.
  • If you will be giving yourself the shot, your doctor or nurse will teach you how to give the shot.
  • Wash your hands before and after use.
  • This medicine needs to be mixed before use. Follow how to mix as you were told by the doctor.
  • A few fluids can be used to mix Myalept (metreleptin). Be sure you know which fluid to use. Talk with your doctor or pharmacist if you are not sure.
  • Let Myalept (metreleptin) come to room temperature before mixing. Do not heat Myalept (metreleptin).
  • Do not shake.
  • Move site where you give the shot each time.
  • Take with or without food.
  • Take Myalept (metreleptin) at the same time of day.
  • Do not mix with any other liquid drugs.
  • Do not mix Myalept (metreleptin) in the same syringe with insulin.
  • If you are also using insulin, you may inject Myalept (metreleptin) and the insulin in the same area of the body but not right next to each other.
  • Do not use if the solution is cloudy, leaking, or has particles.
  • Do not use if solution changes color.
  • Throw away needles in a needle/sharp disposal box. Do not reuse needles or other items. When the box is full, follow all local rules for getting rid of it. Talk with a doctor or pharmacist if you have any questions.

What do I do if I miss a dose?

  • Take a missed dose as soon as you think about it.
  • If it is close to the time for your next dose, skip the missed dose and go back to your normal time.
  • Do not take 2 doses at the same time or extra doses.

What are some side effects that I need to call my doctor about right away?

WARNING/CAUTION: Even though it may be rare, some people may have very bad and sometimes deadly side effects when taking a drug. Tell your doctor or get medical help right away if you have any of the following signs or symptoms that may be related to a very bad side effect:

  • Signs of an allergic reaction, like rash; hives; itching; red, swollen, blistered, or peeling skin with or without fever; wheezing; tightness in the chest or throat; trouble breathing, swallowing, or talking; unusual hoarseness; or swelling of the mouth, face, lips, tongue, or throat.
  • Signs of infection like fever, chills, very bad sore throat, ear or sinus pain, cough, more sputum or change in color of sputum, pain with passing urine, mouth sores, or wound that will not heal.
  • Signs of high blood sugar like confusion, feeling sleepy, more thirst, more hungry, passing urine more often, flushing, fast breathing, or breath that smells like fruit.
  • Dizziness or passing out.
  • A fast heartbeat.
  • A burning, numbness, or tingling feeling that is not normal.
  • Pelvic pain or pressure.
  • Vaginal bleeding that is not normal.
  • Call your doctor right away if you have a swollen gland, night sweats, shortness of breath, or weight loss without trying.
  • Low blood sugar can happen. The chance may be raised when Myalept (metreleptin) is used with other drugs for diabetes. Signs may be dizziness, headache, feeling sleepy or weak, shaking, fast heartbeat, confusion, hunger, or sweating. Call your doctor right away if you have any of these signs. Follow what you have been told to do for low blood sugar. This may include taking glucose tablets, liquid glucose, or some fruit juices.

What are some other side effects of Myalept?

All drugs may cause side effects. However, many people have no side effects or only have minor side effects. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away:

These are not all of the side effects that may occur. If you have questions about side effects, call your doctor. Call your doctor for medical advice about side effects.

You may report side effects to the FDA at 1-800-332-1088. You may also report side effects at

If OVERDOSE is suspected:

If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

How do I store and/or throw out Myalept?

  • Store unopened vials in a refrigerator. Do not freeze.
  • Store in the original container to protect from light.
  • After mixing, be sure you know how long the product is good for and how to store it. Ask your doctor or pharmacist if you are not sure.
  • Keep all drugs in a safe place. Keep all drugs out of the reach of children and pets.
  • Throw away unused or expired drugs. Do not flush down a toilet or pour down a drain unless you are told to do so. Check with your pharmacist if you have questions about the best way to throw out drugs. There may be drug take-back programs in your area.

Consumer information use

  • If your symptoms or health problems do not get better or if they become worse, call your doctor.
  • Do not share your drugs with others and do not take anyone else's drugs.
  • This medicine comes with an extra patient fact sheet called a Medication Guide. Read it with care. Read it again each time Myalept (metreleptin) is refilled. If you have any questions about Myalept (metreleptin), please talk with the doctor, pharmacist, or other health care provider.
  • If you think there has been an overdose, call your poison control center or get medical care right away. Be ready to tell or show what was taken, how much, and when it happened.

Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.