Your Osteoporosis Medications Explained

This guide covers the ten most commonly prescribed osteoporosis medications — including how they work, common side effects, important drug interactions, and how kidney or liver function may affect dosing.

The Top 10 Medications
Bisphosphonate
Alendronate
Fosamax — generic widely available
● Oral — once weekly
01
How it works

Slows the breakdown of bone by inhibiting osteoclasts, helping maintain and improve bone density.

Side effects
  • Heartburn, nausea
  • Esophageal irritation
  • Muscle or bone pain
  • Rare jaw complications
Interactions
  • Separate from calcium & iron
  • NSAIDs increase stomach irritation
Kidney / Liver
Avoid if eGFR <35

No liver adjustment required.

Bisphosphonate
Risedronate
Actonel
● Oral — weekly or monthly
02
How it works

Reduces bone breakdown and may be gentler on the stomach than alendronate.

Side effects
  • Nausea or diarrhea
  • Joint pain
  • Esophageal irritation
Interactions
  • Separate from calcium supplements
  • NSAIDs increase GI risk
Kidney / Liver
Avoid if eGFR <30

No liver adjustment needed.

Bisphosphonate
Zoledronic Acid
Reclast / Aclasta
● IV infusion — yearly
03
How it works

A powerful yearly infusion that suppresses bone resorption.

Side effects
  • Flu-like symptoms
  • Low calcium levels
  • Kidney strain if dehydrated
Interactions
  • NSAIDs may increase renal risk
  • Loop diuretics increase hypocalcemia risk
Kidney / Liver
Avoid if eGFR <35

Hydration required before infusion.

Biologic
Denosumab
Prolia
● Injection — every 6 months
04
How it works

Blocks RANK-L to prevent osteoclast activation and bone loss.

Side effects
  • Low calcium levels
  • Infections
  • Muscle and joint pain
Interactions
  • Immunosuppressants increase infection risk
  • Cinacalcet may worsen hypocalcemia
Kidney / Liver
Monitor calcium closely

No dose adjustment required.

Anabolic Agent
Teriparatide
Forteo
● Daily self-injection
05
How it works

Stimulates osteoblasts to build new bone.

Side effects
  • Dizziness
  • Nausea
  • Leg cramps
Interactions
  • Digoxin toxicity risk
  • Calcium supplements may raise calcium levels
Kidney / Liver
Use cautiously in CKD

Avoid severe renal impairment.

Anabolic Agent
Abaloparatide
Tymlos
● Daily self-injection
06
How it works

Stimulates bone formation with less calcium release than teriparatide.

Side effects
  • Headache
  • Palpitations
  • Dizziness
Interactions
  • Monitor calcium closely
  • Digoxin interaction possible
Kidney / Liver
Caution if eGFR <30

Minimal liver metabolism.

Biologic
Romosozumab
Evenity
● Monthly injection
07
How it works

Builds bone while also reducing bone resorption.

Side effects
  • Joint pain
  • Headache
  • Possible cardiovascular risk
Interactions
  • Monitor calcium-lowering drugs
  • Caution with cardiac medications
Kidney / Liver
Monitor calcium

No dose adjustment required.

SERM
Raloxifene
Evista
● Oral — daily
08
How it works

Acts like estrogen on bone while blocking estrogen effects in breast tissue.

Side effects
  • Hot flashes
  • Leg cramps
  • Blood clot risk
Interactions
  • Warfarin interaction possible
  • Avoid concurrent estrogen therapy
Kidney / Liver
Avoid liver disease

Use cautiously in kidney impairment.

Hormone Therapy
Hormone Replacement Therapy
Various formulations
● Oral, patch, or gel
09
How it works

Replaces estrogen lost during menopause to preserve bone density.

Side effects
  • Breast tenderness
  • Bloating
  • Stroke or clot risk
Interactions
  • Anticonvulsants may reduce effectiveness
  • Warfarin interaction possible
Kidney / Liver
Avoid active liver disease

Transdermal forms preferred in some patients.

Foundation
Calcium & Vitamin D
Various OTC brands
● Daily supplement
10
How it works

Provides the nutrients needed for bone strength and calcium absorption.

Side effects
  • Constipation
  • Bloating
  • Kidney stones (excess intake)
Interactions
  • Separate from thyroid medications
  • Reduces absorption of some antibiotics
Kidney / Liver
Adjust in CKD

Monitor calcium and Vitamin D levels.

Medication classes
Bisphosphonate — slows bone breakdown Biologic — targets specific bone proteins Anabolic — builds new bone SERM — estrogen-receptor modulator Hormone Therapy — replaces estrogen Foundation — essential nutrients
Important

This guide is for general educational purposes only. Always consult your physician or healthcare provider before starting, stopping, or changing osteoporosis medications.