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Alendronic acid

Bisphosphonate · Osteoporosis treatment

Also known as Alendronate, Alendronate sodium

BisphosphonateOsteoporosis treatment
CDSCO approved
EXCRETION
not curated
INTERACTIONS
2 major
SEVERE in our sources
PREGNANCY
Avoid.
FDA category + note
Top interactions
  • DeferasiroxSevereDatabaseDDInter
  • EtelcalcetideSevereDatabaseDDInter

Mechanism

Alendronic acid, a bisphosphonate, influences bone metabolism to prevent bone loss in conditions like osteoporosis. This bone-protection treatment reduces the occurrence of vertebral, non-vertebral, and hip fractures.

Indications

Treatment of postmenopausal osteoporosisTreatment of osteoporosis in menPrevention and treatment of corticosteroid-induced osteoporosis in postmenopausal women not receiving hormone replacement therapy

Dosing

Adult
For treatment of postmenopausal osteoporosis: 10 mg daily by mouth, or 70 mg once weekly by mouth. For treatment of osteoporosis in men: 10 mg daily by mouth. For prevention and treatment of corticosteroid-induced osteoporosis in postmenopausal women not receiving hormone replacement therapy: 10 mg daily by mouth.
Renal adjustment
Avoid if eGFR less than 35 mL/minute/1.73 m2.
Geriatric
Prescription potentially inappropriate in patients with a current or recent history of upper gastrointestinal disease or bleeding due to risk of relapse/exacerbation of oesophagitis, oesophageal ulcer, or oesophageal stricture.

Contraindications

  • Abnormalities of oesophagus
  • Hypocalcaemia
  • Other factors which delay oesophageal emptying (e.g., stricture or achalasia)

Side effects

Common
AlopeciaAnaemiaArthralgiaAstheniaConstipationDiarrhoeaDizzinessDysphagiaElectrolyte imbalanceEye inflammationFeverGastritisGastrointestinal discomfortHeadacheInfluenza like illnessMalaiseMyalgiaNauseaOesophageal ulcerOesophagitisPainPeripheral oedemaRenal impairmentSkin reactionsTaste alteredVomitingGastrointestinal disordersJoint swellingVertigo
Serious
  • Anaphylactic reaction
  • Angioedema
  • Bronchospasm
  • Oesophageal stenosis
  • Osteonecrosis
  • Atypical femur fracture
  • Stevens-Johnson syndrome
  • Haemorrhage
  • Oropharyngeal ulceration
  • Photosensitivity reaction
  • Severe cutaneous adverse reactions (SCARs)
  • Severe oesophageal reactions (oesophageal erosions, oesophageal stricture)

Pregnancy & lactation

Pregnancy

Avoid.

Lactation

Manufacturer advises avoid—no information available.

Drug interactions

Deferasirox
Severe
Database

Drug interaction classified as: synergy

Source: DDInter

Etelcalcetide
Severe
Database

Drug interaction classified as: synergy

Source: DDInter

10 additional low-confidence interactions hidden — those rows lack a documented mechanism or management plan in our sources.

Related guidelines

Other Bisphosphonate drugs

Ask House about Alendronic acid

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Sources: BNF·Verified: 2026-05-10 · House clinical team