What Is Teriparatide?

Teriparatide is a bone-building injectable medication used to treat severe osteoporosis in people at high risk for fractures. Sold under the brand name Forteo, it's a synthetic version of human parathyroid hormone (PTH 1-34) that stimulates new bone growth — making it fundamentally different from other osteoporosis drugs that only slow bone loss.

Originally manufactured by Eli Lilly and Company, Teriparatide was first FDA-approved in 2002. Generic versions are now available from Teva Pharmaceuticals and Alvogen, making this once-exclusive treatment more accessible. It belongs to a drug class called parathyroid hormone analogs (osteoanabolic agents). Teriparatide is not a controlled substance.

What Is Teriparatide Used For?

Teriparatide is FDA-approved for three main indications:

1. Postmenopausal osteoporosis — For women at high risk for fracture, particularly those who have already had a fracture or whose bone density is very low.
2. Male osteoporosis — For men with primary or hypogonadal osteoporosis who are at high risk for fracture.
3. Glucocorticoid-induced osteoporosis — For men and women who have developed osteoporosis due to long-term use of corticosteroid medications (like Prednisone) and are at high risk for fracture.

In all cases, Teriparatide is generally reserved for patients with severe osteoporosis or those who haven't responded well to other treatments like bisphosphonates. Many insurance plans require step therapy — meaning you need to try other medications first before Teriparatide is covered.

Off-Label Uses

Some providers also use Teriparatide off-label for:

• Fracture healing acceleration
• Hypoparathyroidism
• Osteonecrosis of the jaw
• Periodontal disease

These uses are not FDA-approved, and coverage may vary.

How Is Teriparatide Taken?

Teriparatide comes as a prefilled injection pen that delivers 20 mcg subcutaneously (under the skin) once daily. Here are the key details:

• Injection sites: Abdomen or front of the thigh. Rotate sites to minimize irritation.
• Pen supply: Each pen contains 600 mcg/2.4 mL, providing 28 daily doses (a one-month supply).
• First injections: Your doctor will likely recommend sitting or lying down for your first several injections to monitor for dizziness or lightheadedness.
• Storage: The pen must be refrigerated (36°F to 46°F) at all times when not in use. Do not freeze.
• Treatment duration: Typically up to 2 years. After completing Teriparatide, most patients transition to an antiresorptive medication (like a bisphosphonate or Denosumab) to maintain the bone they've built.
• Supplements: Patients should take adequate calcium and vitamin D during treatment if their dietary intake is insufficient.

Who Should Not Take Teriparatide?

Teriparatide is not appropriate for everyone. It is contraindicated in patients with:

• Paget's disease of bone
• Unexplained elevated alkaline phosphatase
• Pediatric and young adult patients with open growth plates (epiphyses)
• Prior radiation therapy to the skeleton
• Pre-existing hypercalcemia (elevated blood calcium)
• Bone metastases or a history of bone cancers
• Metabolic bone diseases other than osteoporosis
• Known hypersensitivity to Teriparatide or its ingredients
• Pregnancy

Before starting Teriparatide, your doctor will check blood work including calcium levels, vitamin D, kidney function, and alkaline phosphatase to make sure it's safe for you.

What Are the Side Effects?

Common side effects of Teriparatide include:

• Nausea
• Headache
• Dizziness
• Orthostatic hypotension (lightheadedness when standing)
• Leg cramps
• Injection site reactions
• Joint pain
• Mild transient hypercalcemia

Serious side effects are uncommon but can include significant hypercalcemia, fainting from blood pressure drops, and allergic reactions. The original boxed warning about osteosarcoma risk (based on rat studies) was removed by the FDA in 2020 after human data showed no increased risk.

How Much Does Teriparatide Cost?

Teriparatide is an expensive medication, but there are ways to manage the cost:

• Brand-name Forteo: $3,100–$5,400 per pen (28-day supply) without insurance
• Generic Teriparatide: Approximately $1,150–$1,900 per pen with discount coupons (GoodRx, SingleCare). Retail without coupons is roughly $3,400 per pen.
• With insurance: Most commercial plans and Medicare Part D cover Teriparatide, but typically require prior authorization and may require step therapy.
• Manufacturer savings: The Forteo copay card from Eli Lilly can bring the cost to as little as $4 per month for eligible commercially insured patients. Teva also offers a copay savings program for generic Teriparatide.
• Patient assistance: The Lilly Cares Foundation provides Forteo at no cost to eligible uninsured or underinsured patients who meet income requirements.

For a deeper dive into all your savings options, read our complete guide on how to save money on Teriparatide.

How Does It Compare to Other Osteoporosis Medications?

Teriparatide belongs to a class of bone-building (anabolic) medications, which sets it apart from antiresorptive drugs. Here's how it compares:

• Abaloparatide (Tymlos) — Another bone-building injection, similar to Teriparatide but with potentially fewer hypercalcemia events.
• Romosozumab (Evenity) — A monthly injection that both builds bone and slows bone loss. Reserved for severe cases; carries a cardiovascular risk warning.
• Denosumab (Prolia) — An injection given every 6 months that slows bone loss but doesn't build new bone. Cannot be stopped abruptly.
• Bisphosphonates (Alendronate, Risedronate, Zoledronic Acid) — First-line oral or IV treatments that slow bone loss. Less expensive but don't actively build new bone.

For more on alternatives, see our guide on alternatives to Teriparatide.

Final Thoughts

Teriparatide is one of the most effective medications available for building new bone and reducing fracture risk in patients with severe osteoporosis. While it's more complex than popping a daily pill — requiring daily injections, refrigeration, and specialty pharmacy dispensing — many patients find the results well worth it.

If your doctor has recommended Teriparatide, the key steps are getting proper specialist care, understanding your savings options, and finding a pharmacy that has it in stock.

Need help finding Teriparatide near you? Try Medfinder to check pharmacy availability and compare prices.