Skytrofa 7.6 mg subcutaneous cartridge


The photos shown are samples only

Medication name

Generic name:
Lonapegsomatropin - subcutaneous injection


Brand name(s)


This medication is used to treat growth failure due to a lack of growth hormone. Growth hormone is normally produced in the brain by a certain gland (pituitary gland) and has various effects on development in the body. A lack of growth hormone in children results in slowed growth and short height for the child's age. Lonapegsomatropin works by providing more growth hormone, which may help the long bones (such as the arms and legs) grow longer.

How to use

Read the Instructions for Use if available from your pharmacist before you start using lonapegsomatropin and each time you get a refill. If you have any questions, ask your doctor or pharmacist.

Read and learn all preparation and usage instructions from the manufacturer and your health care professional. This medication is injected with a device made to help you use it properly. Do not share your device with another person, even if the needle is changed. You may give other people a serious infection, or get a serious infection from them. Learn how to store and discard medical supplies safely.

If your medication (cartridge) has been stored in the refrigerator, take it out of the refrigerator and bring it to room temperature for 15 minutes before use. Do not warm it up in any other way such as by heating in the microwave or placing in hot water. After mixing this medication as directed, check this product visually for particles or discoloration. If either is present, do not use the liquid.

This medication is given by injection under the skin of the stomach (abdomen), thighs, or buttocks as directed by your doctor, usually once weekly. Change the injection site each time to lessen injury under the skin.

The dosage is based on your medical condition, weight, and response to treatment.

Side effects

Nausea, vomiting, diarrhea, abdominal pain, or joint pain may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly.

Remember that this medication has been prescribed because your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor right away if you have any serious side effects, including:

  • development of a limp
  • hip/knee pain
  • numbness/tingling
  • increased thirst/frequent urination
  • swelling hands/ankles/feet
  • nausea/vomiting that doesn't stop
  • severe stomach/abdominal pain that doesn't stop
  • signs of bleeding (such as nosebleeds, small red or purple spots on the skin)
  • symptoms of thyroid problems (such as cold intolerance, unexplained increased weight)

Get medical help right away if you have any very serious side effects, including:

  • seizure

Lonapegsomatropin may increase your risk of getting a new tumor or cancer. Children who have had brain/head radiation treatment for cancer should be monitored for new tumors/cancers. Tell your doctor right away if you or a caregiver notice symptoms such as unusual changes in behavior, vision problems/changes, severe headache, changes in skin color, or change in the appearance or size of a mole. Talk with your doctor for details and to discuss the risks and benefits of this medication.

A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:

  • rash
  • itching/swelling (especially of the face/tongue/throat)
  • severe dizziness
  • trouble breathing

This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.


See also Side Effects section.

Before using lonapegsomatropin, tell your doctor or pharmacist if you are allergic to it; or to somatropin products; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

Before using this medication, tell your doctor or pharmacist your medical history, especially of:

  • adrenal gland problems
  • eye problems (such as diabetic retinopathy)
  • recent major surgery/injury
  • diabetes or family history of diabetes
  • obesity
  • kidney disease
  • cancer (especially of the head/neck)
  • thyroid problems
  • a certain back problem (scoliosis)
  • Prader-Willi syndrome

If you have diabetes, this drug may increase your blood sugar. Check your blood sugar regularly as directed and share the results with your doctor. Tell your doctor right away if you have symptoms of high blood sugar such as increased thirst/urination. Your doctor may need to adjust your diabetes medication, exercise program, or diet.

Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

It is unknown if this drug passes into breast milk. Consult your doctor before breastfeeding.

Drug interactions

Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.

Lonapegsomatropin is very similar to somatropin. Do not use medications containing somatropin while using lonapegsomatropin.


If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call 1-800-222-1222. Canada residents can call 1-844-764-7669.


Do not share this medication with others.

Lab and/or medical tests (such as eye exam, thyroid function, blood sugar, parathyroid hormone, cortisol level) may be done while you are using this medication. Keep all medical and lab appointments.

Missed dose

If you miss a dose, use it as soon as you remember. If it is more than 2 days after the missed dose, skip the missed dose. Use your next dose on the regular scheduled day. Do not double the dose to catch up. If you decide to change the regular scheduled day, make sure to wait at least 5 days between the last dose and the new dosing day.

To avoid missed doses, this medication can be used 2 days before or 2 days after the scheduled dosing day.


Store the cartridges in the refrigerator or at room temperature. The cartridges may be put back in the refrigerator if they have been taken out. After first removal from the refrigerator, write the date on the outer carton and use the medication within 6 months. Keep all medications away from children and pets.

Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.

Important note

HOW TO USE THIS INFORMATION: This is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate for you. This information is not individual medical advice and does not substitute for the advice of your health care professional. Always ask your health care professional for complete information about this product and your specific health needs.

Information last revised May 2024.

Selected from NATIONAL DRUG DATA FILE (NDDF) data included with permission and copyrighted by First Databank, Inc., 2019. This copyrighted material has been downloaded from a licensed data provider.

The above information is intended to supplement, not substitute for, the expertise and judgment of your health care professional. You should consult your health care professional before taking any drug, changing your diet, or commencing or discontinuing any course of treatment.