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
Reclast
Fosamax vs. Reclast Dosage
Fosamax
Reclast
| 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 |
| 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
| 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
| 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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