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Tymlos (abaloparatide) is a daily injectable anabolic medication for osteoporosis made by Radius Health. Like Forteo (teriparatide), it works by stimulating osteoblasts to build new bone — a fundamentally different approach from antiresorptive drugs like Prolia or bisphosphonates, which slow bone breakdown. Tymlos is FDA-approved for postmenopausal women with osteoporosis at high or very high fracture risk.
Tymlos vs. Forteo: Key Differences
| Feature | Tymlos | Forteo |
|---|---|---|
| Drug | Abaloparatide | Teriparatide |
| Injection site | Abdomen only | Abdomen or thigh |
| Duration | Up to 2 years | Up to 2 years |
| Hypercalcemia risk | Lower | Higher |
| Vertebral fracture reduction | 86% (ACTIVE) | ~65% |
Clinical Results
- ACTIVE trial (vs. placebo): 86% reduction in vertebral fractures; 43% reduction in nonvertebral fractures at 18 months
- Spine BMD: +11% over 18 months; comparable to Forteo
- Hip BMD: Numerically greater increases than Forteo in comparative studies
- Lower hypercalcemia: Less calcium elevation compared to teriparatide
⚠️ Follow-on therapy is essential: After completing Tymlos, patients must transition to an antiresorptive medication (Prolia or bisphosphonate) to maintain bone density gains. This transition should be planned with your endocrinologist before the course ends.
Osteoporosis Medication Comparison
| Medication | Class | How Given | Frequency | Special Notes |
|---|---|---|---|---|
| Fosamax | Bisphosphonate | Pill | Weekly | Take fasting, stay upright 30 min |
| Actonel | Bisphosphonate | Pill | Weekly/Monthly | Take fasting, stay upright 30 min |
| Reclast | Bisphosphonate | IV infusion | Once yearly | No weekly pill compliance issues |
| Prolia | RANK-L inhibitor | Injection | Every 6 months | ⚠️ NEVER miss a dose — rebound fracture risk |
| Forteo | Anabolic (PTH) | Daily injection | Daily × 2 yrs | Builds new bone; requires follow-on therapy |
| Tymlos | Anabolic (PTHrP) | Daily injection | Daily × 2 yrs | Builds new bone; requires follow-on therapy |
| Evenity | Dual-action | Monthly injection | Monthly × 12 | Builds AND protects bone; caution w/ CV history |
| Raloxifene | SERM | Daily pill | Daily | Also reduces breast cancer risk |
Frequently Asked Questions About Tymlos
What is Tymlos and how does it differ from Forteo?
Tymlos (abaloparatide) is a daily injectable anabolic medication for osteoporosis, similar in concept to Forteo (teriparatide). Both build new bone by stimulating osteoblasts. However, they act on different parathyroid hormone receptors: Tymlos acts on the PTH1R receptor in a way that favors bone formation with potentially less effect on bone resorption, which may translate to slightly different bone density and fracture outcomes. In head-to-head studies, Tymlos showed similar or greater spine bone density gains compared to Forteo.
How do you take Tymlos?
Tymlos is injected subcutaneously once daily using a prefilled injection pen. Injections are given in the periumbilical region of the abdomen only (unlike Forteo, which can be given in thigh or abdomen). The pen must be kept upright and refrigerated. Each pen lasts 30 days.
How long do you take Tymlos?
Tymlos is approved for up to 2 years of use. Like Forteo, it must be followed by antiresorptive therapy (Prolia or a bisphosphonate) to preserve bone density gains. Without a follow-on medication, bone density will decline.
How effective is Tymlos for fracture prevention?
In the ACTIVE trial, Tymlos reduced new vertebral fractures by 86% and nonvertebral fractures by 43% compared to placebo over 18 months. In the ACTIVE-extension study comparing Tymlos to Forteo, spine BMD gains were similar; Tymlos showed numerically greater hip BMD gains. It also had a lower rate of hypercalcemia compared to teriparatide.
What are the side effects of Tymlos?
Common side effects include dizziness (especially orthostatic — when standing up quickly), nausea, headache, palpitations, and fatigue. Hypercalcemia (elevated calcium) can occur but is less common than with Forteo. Like Forteo, Tymlos carries a black box warning for osteosarcoma based on animal studies — this has not been observed in human clinical use at therapeutic doses.
Who is Tymlos most appropriate for?
Tymlos is FDA-approved for postmenopausal women with osteoporosis at high fracture risk. It's a good option for patients needing anabolic therapy who prefer the periumbilical injection technique, those concerned about the hypercalcemia risk with Forteo, or patients whose insurance covers Tymlos more favorably. Your endocrinologist can help compare Tymlos and Forteo for your specific situation.
Key Takeaways
- Tymlos is a daily injectable anabolic osteoporosis medication — it builds new bone
- Approved for up to 2 years; must follow with antiresorptive therapy
- 86% vertebral fracture reduction vs. placebo in ACTIVE trial
- Lower hypercalcemia risk compared to Forteo (teriparatide)
- An endocrinologist determines whether Tymlos or Forteo is most appropriate for your situation