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Data updated: Jul 17, 2026

FOSAMAX (alendronate sodium) · Merck

Musculoskeletal Approved 1995-09-29

FOSAMAX is a bisphosphonate indicated for: Treatment and prevention of osteoporosis in postmenopausal women Treatment to increase bone mass in men with osteoporosis Treatment of glucocorticoid-induced osteoporosis Treatment of Paget's disease of bone Limitations of use : Optimal duration of use has not been determined. For patients at low-risk for fracture, consider drug discontinuation after 3 to 5 years of use.

11
Indications
--
Phase 3 Trials
2
Priority Reviews
30
Years on Market

Details

Status
Prescription
First Approved
1995-09-29
Routes
ORAL
Dosage Forms
TABLET, SOLUTION

Companies

Active Ingredient: ALENDRONATE SODIUM

FOSAMAX Approval History

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Original
New Indication
New Form
Label Update
291 FDA actions from 1995 to 2026 · 8 indication expansions
Feb 2026 SUPPL
Label · Labeling
Aug 2019 SUPPL
Label · Labeling
Nov 2015 SUPPL
Label · Labeling

What FOSAMAX Treats

4 indications

FOSAMAX is approved for 4 conditions since its original approval in 1995. These indications span multiple therapeutic areas including oncology, immunology, and more.

  • Postmenopausal osteoporosis
  • Osteoporosis in men
  • Glucocorticoid-induced osteoporosis
  • Paget's disease of bone

Same approved indications as ALENDRONATE SODIUM (same active ingredient).

Source: FDA Label
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Clinical Trial Registry

6 trials
Trial Sponsor ID Phase Status Title
NCT06016634 1693339 5K23HL148310, 2020095 Ph 2 recruiting Alendronate for Osteonecrosis in Adults With Sickle Cell Disease
NCT05493761 OsteoNAFLD 88235 Ph 4 active not recruiting Effect of Anti-osteoporotic Medications on Nonalcoholic Fatty Liver Disease
NCT04704947 osteoprosis Ph 3 recruiting Clinical Study Evaluating Beta Blockers Use and Fracture Risk in Patients With Primary Osteoporosis
NCT02795546 PMVIDS/PER/0029/2014 Ph 4 completed Effect of Alendronate With β - TCP Bone Substitute in Surgical Therapy of Periodontal Intra-osseous Defects.
NCT00996801 results posted 5442-012 2009-014729-18, CTRI/2010/091/000258 Ph 2 completed MK-5442 in the Treatment of Osteoporosis in Postmenopausal Women Previously Treated With an Oral Bisphosphonate (MK-5442-012)
NCT00822029 2006-005678-36 Ph 3 terminated Use of Oral Bisphosphonates in the Treatment of Osteoporosis of Non-walking Children With Cerebral Palsy
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Active Pipeline

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Ongoing clinical trials by development phase

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Key Completed Trials

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Completed studies with published results, ranked by significance

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Trial Timeline

Full development history with FDA approval milestones

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Understanding FDA Approval Types
Count Type What it means
- ORIG Original approval - drug first enters market
- SUPPL - Efficacy New indication (new disease/condition approved)
- SUPPL - Labeling Label text changes (warnings, dosing updates)
- SUPPL - Manufacturing Production changes (new facility)
- SUPPL - Chemistry Formulation changes (new dosage strength)

Green lines in the timeline show ORIG and Efficacy approvals - the clinically meaningful milestones.

FOSAMAX FDA Label Details

Indications & Usage

FDA Label (PDF)

FOSAMAX is a bisphosphonate indicated for: Treatment and prevention of osteoporosis in postmenopausal women Treatment to increase bone mass in men with osteoporosis Treatment of glucocorticoid-induced osteoporosis Treatment of Paget's disease of bone Limitations of use : Optimal duration of use has not been determined. For patients at low-risk for fracture, consider drug discontinuation after 3 to 5 years of use. 1.1 Treatment of Osteoporosis in Postmenopausal Women FOSAMAX ® is indicated for the treatment of osteoporosis in postmenopausal women. In postmenopausal women, FOSAMAX increases bone...

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Data Sources

Data sourced from official FDA and NIH databases. Click links to verify on original sources.