Fosamax vs. Evenity

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

Key Takeaways

  • Fosamax is a daily or weekly pill, while Evenity is a once-monthly injection limited to 12 doses in a lifetime.

  • Evenity carries a boxed warning for heart attack, stroke, and cardiovascular death, while Fosamax's main risks involve the esophagus and jaw.

  • Fosamax costs far less out of pocket than Evenity, which usually requires switching to another osteoporosis drug afterward to hold onto bone gains.

Fosamax vs. Evenity Drug Summary

Fosamax

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

Evenity

Evenity (romosozumab-aqqg) is a sclerostin inhibitor that both builds new bone and slows bone loss, approved for postmenopausal women with osteoporosis at high risk of fracture. It's given as two subcutaneous injections once a month, for a maximum of 12 doses in a lifetime, followed by another therapy to maintain the bone gained.

Fosamax vs. Evenity Side Effects

Fosamax

Most common
abdominal pain (1% to 10%)
dyspepsia (1% to 10%)
acid regurgitation (1% to 10%)
nausea (1% to 10%)

Evenity

Most common
arthralgia (up to 13.1%)
headache (≥5%)
injection site reactions (4.9%)
nasopharyngitis (≥2%)

Fosamax vs. Evenity 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

Evenity

Dosage
Dosage Table
STAGE DOSE WHEN
Starting dose 210 mg once monthly At the start
Maximum dose 210 mg once monthly Same as starting
Dose changes None Fixed dose

Fosamax vs. Evenity Indications

Fosamax

Fosamax is FDA-approved for several bone conditions beyond routine postmenopausal osteoporosis. It can be used in men, in people on long-term steroids, and for Paget's disease of bone, giving it a broader label than many newer osteoporosis drugs.

  • Treatment of osteoporosis in postmenopausal women

  • Prevention of osteoporosis in postmenopausal women

  • Increasing bone mass in men with osteoporosis

  • Glucocorticoid-induced osteoporosis

Evenity

Evenity's approval is narrower, covering only postmenopausal women with osteoporosis who are at high risk for fracture. It is not approved for men, premenopausal women, or women of reproductive potential, largely due to safety concerns.

  • Postmenopausal women with osteoporosis at high fracture risk

  • History of osteoporotic fracture

  • Multiple risk factors for fracture

  • Not approved for men or premenopausal women

Fosamax vs. Evenity Pros and Cons

Fosamax

Fosamax has decades of real-world safety data, a low-cost generic option, and flexible daily or weekly dosing, but it requires strict administration rules to avoid esophageal irritation. It also is not appropriate for people with severe kidney impairment or uncorrected low calcium.

Pros

  • Available as a low-cost generic tablet

  • Decades of long-term safety data

  • Flexible daily or weekly dosing options

Cons

  • Must be taken on an empty stomach with plain water

  • Requires staying upright for 30+ minutes after dosing

  • Not approved for severe renal impairment

  • Long-term use linked to atypical femoral fractures

Evenity

Evenity offers a unique dual action that builds new bone while also reducing bone breakdown, but its cardiovascular boxed warning limits who can safely use it. Treatment is capped at 12 lifetime doses and costs substantially more than oral options like Fosamax.

Pros

  • Builds new bone instead of only slowing loss

  • Only one injection visit needed per month

  • Option for patients at very high fracture risk

Cons

  • Boxed warning for heart attack, stroke, and death

  • Cannot be started within a year of MI or stroke

  • Limited to 12 doses in a lifetime

  • Roughly $1,825 to $2,629 per month without insurance, before savings programs

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