Fosamax vs. Reclast

See how Fosamax and Reclast compare on approved uses, dosing, side effects, and cost.

Key Takeaways

  • Both Fosamax and Reclast are bisphosphonates approved to treat and prevent osteoporosis in postmenopausal women, build bone in men, and treat glucocorticoid-induced osteoporosis and Paget's disease.

  • Fosamax is a tablet taken daily or weekly at home, while Reclast is a single IV infusion given once a year or once every two years by a healthcare provider.

  • Neither drug is recommended for patients with severe kidney impairment, so kidney function is checked before starting either one.

Fosamax vs. Reclast Drug Summary

Fosamax

Fosamax (alendronate) is an oral bisphosphonate that slows bone breakdown to treat and prevent osteoporosis in postmenopausal women, build bone in men, and treat glucocorticoid-induced osteoporosis and Paget's disease. It is taken as a tablet once daily or once weekly, on an empty stomach with plain water, while staying upright for at least 30 minutes.

Reclast

Reclast (zoledronic acid) is an IV bisphosphonate approved for the same core osteoporosis and Paget's disease uses as Fosamax. It is given as a single infusion by a healthcare provider, once a year for treatment or once every two years for prevention.

Fosamax vs. Reclast Side Effects

Fosamax

Most common
Abdominal pain (1% to 10%)
Dyspepsia (1% to 10%)
Acid regurgitation (1% to 10%)
Nausea (1% to 10%)

Reclast

Most common
Myalgia (up to 17%)
Fever (up to 16%)
Fatigue (up to 12%)
Arthralgia (up to 11%)

Fosamax vs. Reclast Dosage

Fosamax

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 40 mg once daily At the start
Maximum dose 40 mg once daily Same as starting
Dose changes None Fixed dose

Reclast

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 5 mg IV infusion At the start
Maximum dose 5 mg IV infusion Same as starting
Dose changes None Fixed dose

Fosamax vs. Reclast Indications

Fosamax

Fosamax is FDA-approved to treat and prevent osteoporosis in postmenopausal women, increase bone mass in men with osteoporosis, treat glucocorticoid-induced osteoporosis, and treat Paget's disease of bone. It works by slowing the bone breakdown that raises fracture risk over time.

  • Treatment of osteoporosis in postmenopausal women

  • Prevention of osteoporosis in postmenopausal women

  • Increase bone mass in men with osteoporosis

  • Treatment of glucocorticoid-induced osteoporosis

  • Treatment of Paget's disease of bone

Reclast

Reclast carries the same core osteoporosis indications as Fosamax, but is delivered as a once-a-year IV infusion instead of a pill. It treats and prevents postmenopausal osteoporosis, builds bone in men, and treats glucocorticoid-induced osteoporosis and Paget's disease.

  • Treatment of osteoporosis in postmenopausal women

  • Prevention of osteoporosis in postmenopausal women

  • Increase bone mass in men with osteoporosis

  • Prevention and treatment of glucocorticoid-induced osteoporosis

  • Treatment of Paget's disease of bone

Fosamax vs. Reclast Pros and Cons

Fosamax

Fosamax has decades of real-world use and comes as a low-cost generic tablet, but its strict dosing rules and common GI side effects can make daily or weekly adherence difficult for some patients.

Pros

  • Available as a low-cost generic tablet

  • Can be taken at home, no clinic visit needed

  • Flexible daily or weekly dosing options

  • Long-term safety data dating back to 1995

Cons

  • Must stay upright for 30 minutes after dosing

  • Requires an empty stomach and plain water only

  • GI side effects like heartburn are common

  • Daily or weekly adherence can lapse over time

Reclast

Reclast trades a daily pill routine for a once-yearly infusion given in a clinic, which removes adherence worries but adds its own monitoring requirements. It can be a good fallback for patients who can't tolerate oral bisphosphonates.

Pros

  • Only one infusion needed per year, or every 2 years for prevention

  • No daily pill routine or upright-posture rule

  • Given by a healthcare professional, removing dosing errors

  • An option for patients who can't tolerate oral bisphosphonates

Cons

  • Flu-like reactions are common after the first infusion

  • Requires an in-office or infusion-center visit

  • Kidney function must be checked before every dose

  • Effects last months to years once infused, harder to reverse quickly

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