What is Forteo: Uses, Warnings & Interactions

Updated May 14, 2025  •  Published Dec 31, 2020

Forteo overview

BRAND NAMES:

  • Forteo

Generic Names:

  • Forteo

Uses:

  • Treats osteoporosis (weak or brittle bones) in men, and in women who have gone through menopause.

Therapeutic Classes:

  • Calcium Regulator

Forms:

  • Injectable

How it’s taken:

  • By injection

What is Forteo used for?

What form(s) does Forteo come in

  • Injectable

What are common Forteo doses?

  • Pen 2.4000000953674316ML of 600MCG/2.4ML

Common Forteo prescriptions

  • Forteo
    2.24ml of 560mcg/2.24ml pen

How to take Forteo

  • Do not use this medicine if it looks cloudy, colored, or if it has specks in it. The medicine inside the pen should be clear and colorless.

  • You should not use this medicine for longer than 2 years. It is only part of a complete plan for treating osteoporosis. Ask your doctor about other things you can do to help yourself. This may include taking vitamin or mineral supplements, getting regular exercise, and not smoking.

  • Do not use a pen for more than 28 days (4 weeks) after it has been opened, even if there is still some medicine in it.

  • You can use this medicine at any time of the day, however using it at the same time each day may help you remember to take your shot.

  • When you first start using this medicine, give yourself a shot while you are in an area where it is easy for you to sit or lay down right away if you become dizzy.

  • This medicine comes in a special pre-filled pen. Be sure you understand how to use the pen to give yourself a shot.

  • Give yourself the shot in your thigh muscle or in your lower stomach area. Be sure to put the cap back on the pen after giving yourself a shot. Put the pen back in the refrigerator right after you are done giving yourself the shot.

  • Injection routeYou may be taught how to give your medicine at home. Make sure you understand all instructions before giving yourself an injection. Do not use more medicine or use it more often than your doctor tells you to.

  • Injection routeYour doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given as a shot under your skin.

  • Injection routeYou will be shown the body areas where this shot can be given. Use a different body area each time you give yourself a shot. Keep track of where you give each shot to make sure you rotate body areas.

  • This medicine should come with a Medication Guide. Ask your pharmacist for a copy if you do not have one.

  • Injection routeYour doctor will prescribe your exact dose and tell you how often it should be given. This medicine is given as a shot under your skin.

  • You should not use this medicine for longer than 2 years. It is only part of a complete plan for treating osteoporosis. Ask your doctor about other things you can do to help yourself. This may include taking vitamin or mineral supplements, getting regular exercise, and not smoking.

  • Injection routeYou will be shown the body areas where this shot can be given. Use a different body area each time you give yourself a shot. Keep track of where you give each shot to make sure you rotate body areas.

  • When you first start using this medicine, give yourself a shot while you are in an area where it is easy for you to sit or lay down right away if you become dizzy.

  • This medicine should come with a Medication Guide. Ask your pharmacist for a copy if you do not have one.

  • This medicine comes in a special pre-filled pen. Be sure you understand how to use the pen to give yourself a shot.

  • Do not use this medicine if it looks cloudy, colored, or if it has specks in it. The medicine inside the pen should be clear and colorless.

  • Injection routeYou may be taught how to give your medicine at home. Make sure you understand all instructions before giving yourself an injection. Do not use more medicine or use it more often than your doctor tells you to.

  • Give yourself the shot in your thigh muscle or in your lower stomach area. Be sure to put the cap back on the pen after giving yourself a shot. Put the pen back in the refrigerator right after you are done giving yourself the shot.

  • Do not use a pen for more than 28 days (4 weeks) after it has been opened, even if there is still some medicine in it.

  • You can use this medicine at any time of the day, however using it at the same time each day may help you remember to take your shot.

What to do if you miss a dose of Forteo

  • Take a dose as soon as you remember. If it is almost time for your next dose, wait until then and take a regular dose. Do not take extra medicine to make up for a missed dose.

  • Ask your pharmacist, doctor, or health caregiver about the best way to dispose of any leftover medicine and the used pen. You will also need to throw away old medicine 28 days after the first time you use the pen, or after the expiration date has passed.

  • Keep all medicine out of the reach of children. Never share your medicine with anyone.

Forteo contraindications

  • You should not use this medicine if you have had an allergic reaction to teriparatide.

Forteo warnings

  • When this medicine was tested in rats, some of the rats developed bone cancer. It is not known if the same thing could happen in people. Your risk of bone cancer may be higher if you have Paget's disease or another bone disease, or if you are still growing. Your risk may also be higher if you have ever had bone cancer, or if you have had external beam or implant radiation treatment on your bones. Make sure your doctor knows if you have ever had any of these bone conditions or treatments.

  • Make sure your doctor knows if you are pregnant or breastfeeding, or if you have heart disease, liver disease, kidney disease, kidney stones, or if you are on dialysis.

  • Make sure your doctor knows if you have hypercalcemia (high levels of calcium in your blood), or if you have a disease that may cause you to have hypercalcemia, such as hyperparathyroidism (overactive parathyroid gland).

  • You are more likely to get dizzy, lightheaded, or have a pounding heartbeat when you first start using this medicine. Sit or lie down if this happens. Call your doctor if these side effects do not go away, or get worse.

  • Tell any doctor or dentist who treats you that you are using this medicine. This medicine may affect certain medical test results.

  • This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous if you are not alert.

  • Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.

Forteo interactions

  • When this medicine was tested in rats, some of the rats developed bone cancer. It is not known if the same thing could happen in people. Your risk of bone cancer may be higher if you have Paget's disease or another bone disease, or if you are still growing. Your risk may also be higher if you have ever had bone cancer, or if you have had external beam or implant radiation treatment on your bones. Make sure your doctor knows if you have ever had any of these bone conditions or treatments.

  • You are more likely to get dizzy, lightheaded, or have a pounding heartbeat when you first start using this medicine. Sit or lie down if this happens. Call your doctor if these side effects do not go away, or get worse.

  • This medicine may make you dizzy or drowsy. Avoid driving, using machines, or doing anything else that could be dangerous if you are not alert.

  • Make sure your doctor knows if you are also using digoxin (Lanoxin®).

  • Make sure your doctor knows if you have hypercalcemia (high levels of calcium in your blood), or if you have a disease that may cause you to have hypercalcemia, such as hyperparathyroidism (overactive parathyroid gland).

  • Tell any doctor or dentist who treats you that you are using this medicine. This medicine may affect certain medical test results.

  • Your doctor will do lab tests at regular visits to check on the effects of this medicine. Keep all appointments.

Forteo side effects

Serious Side Effects

  • Lightheadedness or fainting.

  • Leg cramps, joint pain, or muscle spasms.

  • Chest pain, fast heartbeat.

  • Allergic reaction: Itching or hives, swelling in your face or hands, swelling or tingling in your mouth or throat, chest tightness, trouble breathing

  • Nausea, vomiting, or constipation.

  • Trouble sleeping.

  • Unusual tiredness or weakness.

Less Serious Side Effects

  • Headache or neck pain.

  • Skin rash.

  • Redness, pain, swelling, itching, bruising, or bleeding where the shot was given.

  • Sweating.

  • Trouble sleeping.

  • Runny or stuffy nose, cough.

  • Diarrhea or upset stomach.

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