Forteo Pen

Generic name: teriparatide [ ter-i-PAR-a-tide ]
Brand name: Forteo Pen
Drug class: Parathyroid hormone and analogs

Medically reviewed by Drugs.com on Apr 21, 2025. Written by Cerner Multum.

What is Forteo Pen?

Forteo Pen is used to treat osteoporosis caused by menopause, steroid use, or gonadal failure. Forteo Pen is for use when you have a high risk of bone fracture due to osteoporosis.

Forteo Pen may also be used for purposes not listed in this medication guide.

Forteo Pen side effects

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

Forteo Pen may cause serious side effects. Call your doctor at once if you have:

• bone pain;

• new or unusual swelling or lumps under your skin;

• a light-headed feeling, like you might pass out (may occur within 4 hours after injection);

• pounding heartbeats or fluttering in your chest after using an injection; or

• high calcium levels--confusion, muscle weakness, nausea, vomiting, lack of energy, constipation, increased thirst or urination, weight loss.

Common side effects of Forteo Pen may include:

• nausea;

• joint pain; or

• pain anywhere in your body.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Related/similar drugs

Warnings

Avoid smoking cigarettes or drinking alcohol. Smoking or heavy drinking can reduce your bone mineral density, making fractures more likely.

Before taking this medicine

You should not use Forteo Pen if you are allergic to it.

Forteo Pen is not for use in children or young adults whose bones are still growing.

Tell your doctor if you have ever had:

• Paget's disease or a bone disease other than osteoporosis;

• bone cancer or radiation treatment;

• a genetic condition that increases your risk of bone cancer;

• overactive parathyroid glands;

• high blood levels of calcium;

• a painful skin condition caused by too much calcium;

• kidney failure;

• a kidney stone; or

• an autoimmune disorder such as rheumatoid arthritis, lupus, or psoriasis.

Tell your doctor if you are pregnant or breastfeeding.

How should I use Forteo Pen?

Follow all directions on your prescription label and read all medication guides or instruction sheets. Use the medicine exactly as directed.

Forteo Pen is injected under the skin. A healthcare provider may teach you how to properly use the medication by yourself.

Forteo Pen is usually given once per day at the same time each day.

Read and carefully follow any Instructions for Use provided with your medicine. Ask your doctor or pharmacist if you don't understand all instructions.

Prepare an injection only when you are ready to give it. Do not use if the medicine looks cloudy, has changed colors, or has particles in it. Call your pharmacist for new medicine.

Your healthcare provider will show you where on your body to inject Forteo Pen. Use a different place each time you give an injection. Do not inject into the same place two times in a row.

Use only the injection pen provided with Forteo Pen. Do not transfer the medicine to a syringe or other injection device or you could get an overdose.

Forteo Pen can cause you to feel dizzy or light-headed. Always give your injection at a time and place where you can sit or lie down for a short time afterward.

Each prefilled injection pen contains enough Forteo Pen for 28 separate injections. Throw the pen away after 28 injections, even if there is still medicine left inside.

Forteo Pen may be only part of a complete treatment program that also includes diet, exercise, taking vitamin or mineral supplements, and changing certain behaviors. Follow your doctor's instructions very closely.

Store the injection pen in a refrigerator when not in use. Take the pen out of the refrigerator only long enough to use it. After use, remove the needle, recap the pen, and return it to the refrigerator.

Use a needle and syringe only once and then place them in a puncture-proof "sharps" container. Follow state or local laws about how to dispose of this container. Keep it out of the reach of children and pets.

Do not freeze Forteo Pen, and throw away the medicine if it has become frozen.

Your doctor will determine how long to treat you with Forteo Pen. Forteo Pen is sometimes given for only 2 years.

What happens if I miss a dose?

Use the missed dose on the same day you remember it. Use your next dose at the regular time and stay on your once-daily schedule. Do not use 2 doses in one day.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

Overdose symptoms may include nausea, vomiting, dizziness, headache, feeling light-headed, or fainting.

What should I avoid while using Forteo Pen?

Avoid driving or hazardous activity until you know how Forteo Pen will affect you. Your reactions could be impaired.

Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.

Avoid smoking, or try to quit. Smoking can reduce your bone mineral density, making fractures more likely.

Avoid drinking large amounts of alcohol. Heavy drinking can also cause bone loss.

What other drugs will affect Forteo Pen?

Tell your doctor about all your other medicines, especially:

• digoxin, digitalis.

• warfarin (Coumadin, Jantoven); or

• a steroid medicine (such as hydrocortisone, prednisone, methylprednisolone, and others).

This list is not complete. Other drugs may affect Forteo Pen, including prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible drug interactions are listed here.

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Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use this medication only for the indication prescribed.

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

Medical Disclaimer

Copyright 1996-2025 Cerner Multum, Inc. Version: 3.03.