Brand Reference: Fosamax
| Metric | Verified Benchmark | Source |
|---|---|---|
| Alendronate Sodium RxNorm Concept ID | 46041 | U.S. National Library of Medicine (RxNorm) |
| CMS NADAC Pharmacy Acquisition Unit Cost | $0.1900 / unit | CMS Medicaid NADAC Weekly Feed |
| Walk-In Chain Pharmacy Cash Average | $38.00 / mo | CMS NADAC + U.S. Retail Markup Index |
| Mark Cuban Cost Plus Wholesale Price | $5.60 / mo | Cost Plus Drugs Wholesale Feed |
| Community Mean Out-of-Pocket Paid | $7.00 / mo | 15 Zero-PHI Verified Patient Logs |
Chemically adsorbs onto exposed trabecular bone hydroxyapatite crystals and enters resorbing osteoclasts to inhibit farnesyl pyrophosphate synthase (FPPS) in the mevalonate pathway, blocking Rab/Rho GTPase prenylation to halt osteoclast ruffled-border bone resorption.
CMS National Average Drug Acquisition Cost (NADAC) tracking places Alendronate Sodium (Fosamax, RxCUI 46041) at $0.1900 per unit, whereas walk-in chain pharmacies bill cash patients an average of $38.00 monthly—creating a 85% ($32.40/mo) wholesale arbitrage spread down to $5.60.
Systemic exposure to Alendronate Sodium reflects 0.6% fasting oral with plain water (0% if taken with coffee/juice) absorption kinetics and zero metabolism; 50% skeletal binding + 50% unchanged renal excretion, sustaining receptor engagement across a > 10 years skeletal mineral half-life / < 2 hours plasma clearance half-life window (3 months ctx bone-turnover marker drop; 12 months spine bmd rise response profile).
Dosing protocols (70 mg PO once weekly fasting with 8 oz plain water (remain upright 30 min)) balance efficacy (82.00% patient satisfaction across 15 logs) against heartburn if upright rule broken (14% of reports), transient myalgia (8% of reports), with strict avoidance in achalasia or esophageal stricture delaying emptying; inability to sit/stand upright 30 min; hypocalcemia; crcl < 35 ml/min.
Across 15 verified cash-pay logs, Alendronate Sodium achieves a 82.00% Worth-It rating with out-of-pocket spend averaging $7.00/mo versus $38.00/mo walk-in retail.
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Switched to Cost Plus Drugs at 70 mg PO once weekly fasting with 8 oz plain water (remain upright 30 min) for Alendronate Sodium; monthly out-of-pocket dropped to $4.93 compared with $38.00 retail.
Completed 10 weeks on Alendronate Sodium (70 mg PO once weekly fasting with 8 oz plain water (remain upright 30 min)). Zero notable side effects on steady dosing.
Consistent biomarker response on 70 mg PO once weekly fasting with 8 oz plain water (remain upright 30 min) Alendronate Sodium sourced via Cash Clinic ($6.50/mo cash pay without insurance prior authorization).