Alendronate
Prescription ·Exploratory record · not publication-reviewed ·Updated July 13, 2026
Alendronate is the most widely prescribed bisphosphonate for the prevention and treatment of osteoporosis in postmenopausal women, glucocorticoid-induced osteoporosis, and osteoporosis in men. The Fracture Intervention Trial (FIT) demonstrated significant reductions in vertebral and hip fractures. It is also used for Paget's disease of bone.
Exploratory record, not a reviewed medical publication.
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This generated database record has not completed a claim-level review by a qualified human medical reviewer. Bibliography links and evidence labels are not approval. The page remains available for reference and is excluded from search indexing.
What the research says.
A quick, data-only summary. The full evidence, dosing, and sources are below.
Alendronate is the most widely prescribed bisphosphonate for the prevention and treatment of osteoporosis in postmenopausal women, glucocorticoid-induced osteoporosis, and osteoporosis in men. NutriStack rates the supporting evidence as strong. Common adult dosing is Treatment: 70 mg once weekly or 10 mg daily; Prevention: 35 mg once weekly or 5 mg daily (as prescribed by your physician), though a prescriber sets the actual dose. With long-term use it can deplete calcium. This profile indexes 10 sources.
- Esophageal irritation, esophagitis, and ulceration
- Abdominal pain and dyspepsia
- Nausea
- Esophageal abnormalities that delay emptying (stricture, achalasia)
- Inability to stand or sit upright for at least 30 minutes
The bottom line
Evidence rating strong. Most-documented uses: reduces vertebral fracture risk by 44% (fit trial), reduces hip fracture risk by 51% in women with existing vertebral fractures, increases bone mineral density at spine and hip. 10 sources indexed (2017–2026), with 0 interaction records on file.
How it works, mechanistically.
Core mechanism
A nitrogen-containing bisphosphonate that binds to hydroxyapatite on bone surfaces undergoing active resorption. During osteoclast-mediated bone resorption, alendronate is internalized by osteoclasts and inhibits farnesyl pyrophosphate synthase (FPPS), a key enzyme in the mevalonate pathway. This disrupts osteoclast function, induces apoptosis, and reduces bone turnover, leading to net increases in bone mineral density.7,9
Dosing & protocol.
Take first thing in the morning on an empty stomach with 6–8 oz of plain water only. Remain upright (sitting or standing) for at least 30 minutes after taking. Do not eat, drink anything other than water, or take other medications for at least 30 minutes. Food, calcium, and other minerals dramatically reduce absorption (bioavailability is only ~0.7%).
What it depletes.
Nutrients this medication can lower over time, and what to replace.
Calcium
ModerateBisphosphonate suppression of bone resorption can lower serum calcium, especially when calcium intake, vitamin D status, or kidney function is poor.
Full safety detail.
Side effects
- Esophageal irritation, esophagitis, and ulceration
- Abdominal pain and dyspepsia
- Nausea
- Musculoskeletal pain (bone, joint, or muscle pain)
- Osteonecrosis of the jaw (rare, primarily with IV bisphosphonates or prolonged use)
- Atypical femoral fractures (rare, with long-term use >5 years)
- Hypocalcemia
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
5- 1Adverse Gastrointestinal Effects of Alendronate Versus Risedronate in Osteoporosis: A Systematic Review and Meta-analysisPMIDNouh MI, Albuti H, Hasosah M et al. · Annals of African medicine · 2026
Nouh MI, Albuti H, Hasosah M et al.. Adverse Gastrointestinal Effects of Alendronate Versus Risedronate in Osteoporosis: A Systematic Review and Meta-analysis. Annals of African medicine. 2026
- 2Does alendronate enhance survival rates in osteoporosis patients? A meta-analysis of randomized controlled trialsPMIDSun R, Lan Z, Wu G et al. · Science progress · 2025
Sun R, Lan Z, Wu G et al.. Does alendronate enhance survival rates in osteoporosis patients? A meta-analysis of randomized controlled trials. Science progress. 2025
- 3Clinical Efficacy and Safety of Teriparatide Versus Alendronate in Postmenopausal Osteoporosis: A Systematic Review of Randomized Controlled TrialsPMIDNunkoo S, Krissheeven M, Chitravanshi A et al. · Cureus · 2024
Nunkoo S, Krissheeven M, Chitravanshi A et al.. Clinical Efficacy and Safety of Teriparatide Versus Alendronate in Postmenopausal Osteoporosis: A Systematic Review of Randomized Controlled Trials. Cureus. 2024
- 4Effects of alendronate for treatment of glucocorticoid-induced osteoporosis: A meta-analysis of randomized controlled trialsPMIDWang YK, Zhang YM, Qin SQ et al. · Medicine · 2018
Wang YK, Zhang YM, Qin SQ et al.. Effects of alendronate for treatment of glucocorticoid-induced osteoporosis: A meta-analysis of randomized controlled trials. Medicine. 2018
- 5Alendronate for the Treatment of Osteoporosis in Men: A Meta-Analysis of Randomized Controlled TrialsPMIDXu Z · American journal of therapeutics · 2017
Xu Z. Alendronate for the Treatment of Osteoporosis in Men: A Meta-Analysis of Randomized Controlled Trials. American journal of therapeutics. 2017
Reference material
5- 6Black DM et al. Randomised trial of effect of alendronate on risk of fracture in women with existing vertebral fractures (Fracture Intervention Trial, FIT). Lancet. 1996;348(9041):1535-1541.Source linkedPMID
- 7Cummings SR et al. Effect of alendronate on risk of fracture in women with low bone density but without vertebral fractures (FIT-2). JAMA. 1998;280(24):2077-2082.Source linkedPMID
- 8Black DM et al. Effects of continuing or stopping alendronate after 5 years of treatment (FLEX). JAMA. 2006;296(24):2927-2938.Source linkedPMID
- 9Kendler DL, Roux C, Benhamou CL et al.. Effects of denosumab on bone mineral density and bone turnover in postmenopausal women transitioning from alendronate therapy. Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research. 2010Source linkedPMID
- 10Reynolds NA, Curran MP. Alendronate/colecalciferol. Treatments in endocrinology. 2005Source linkedPMID
Common questions.
Quick answers about Alendronate, drawn from the data on this page.
What is Alendronate?
Alendronate is the most widely prescribed bisphosphonate for the prevention and treatment of osteoporosis in postmenopausal women, glucocorticoid-induced osteoporosis, and osteoporosis in men. The Fracture Intervention Trial (FIT) demonstrated significant reductions in vertebral and hip fractures. It is also used for Paget's disease of bone.
What is Alendronate used for?
Commonly cited benefits of Alendronate include: Reduces vertebral fracture risk by 44% (FIT trial); Reduces hip fracture risk by 51% in women with existing vertebral fractures; Increases bone mineral density at spine and hip; Available as once-weekly dosing for convenience; Generic formulations widely available and affordable. NutriStack rates the overall evidence as strong.
What is a typical dose of Alendronate?
A typical adult dose of Alendronate is Treatment: 70 mg once weekly or 10 mg daily; Prevention: 35 mg once weekly or 5 mg daily (as prescribed by your physician). The commonly recommended form is Oral tablet; effervescent tablet (Binosto) for those who have difficulty swallowing. These are general ranges, not personalized advice; confirm the right dose with a clinician.
What are the side effects of Alendronate?
Reported side effects include esophageal irritation, esophagitis, and ulceration, abdominal pain and dyspepsia, nausea, musculoskeletal pain (bone, joint, or muscle pain), osteonecrosis of the jaw (rare, primarily with iv bisphosphonates or prolonged use), atypical femoral fractures (rare, with long-term use >5 years). This is educational information; check with a healthcare professional before use.
How strong is the evidence for Alendronate?
NutriStack rates this as Strong, meaning multiple high-quality meta-analyses or systematic reviews converge on the same finding. Full tier criteria are at https://nutristackapp.com/methodology/evidence-tiers.
Use this with your stack
Alendronate in NutriStack.
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