What Is Alendronate? Uses, Dosage, and What You Need to Know in 2026

Alendronate Is a Bisphosphonate Medication Used to Treat and Prevent Osteoporosis

Alendronate Sodium is a prescription medication in the bisphosphonate drug class. It works by slowing bone loss and helping maintain or increase bone density. It is one of the most commonly prescribed medications for osteoporosis in the United States.

What Is Alendronate?

Alendronate is sold under the brand names Fosamax and Binosto. The generic version (Alendronate Sodium) is manufactured by multiple pharmaceutical companies and is widely available at most pharmacies.

Key facts about Alendronate:

• Drug class: Bisphosphonate
• Generic name: Alendronate Sodium
• Brand names: Fosamax, Binosto, Fosamax Plus D
• Controlled substance: No — Alendronate is not a controlled substance
• FDA approval: Originally approved for osteoporosis treatment
• Available forms: Oral tablets (5 mg, 10 mg, 35 mg, 70 mg), oral solution (70 mg/75 mL), and effervescent tablet (Binosto, 70 mg)

Because it's available as a generic, Alendronate is significantly more affordable than brand-name options. Learn more about how Alendronate works in your body.

What Is Alendronate Used For?

Alendronate has several FDA-approved uses:

1. Treatment of osteoporosis in postmenopausal women — This is the most common use. Alendronate reduces the risk of spine and hip fractures in women who have already developed osteoporosis.
2. Prevention of osteoporosis in postmenopausal women — For women at risk of developing osteoporosis but who don't yet meet the diagnostic criteria.
3. Treatment of osteoporosis in men — Osteoporosis isn't just a women's condition. Alendronate is approved for men with osteoporosis as well.
4. Glucocorticoid-induced osteoporosis — If you take corticosteroids (like Prednisone) long-term, Alendronate can help protect your bones from steroid-related bone loss.
5. Paget's disease of bone — A condition where bone breaks down and regrows abnormally. Alendronate at a higher dose (40 mg daily) can treat this condition.

How Is Alendronate Taken?

Alendronate has very specific dosing instructions that are critical for both effectiveness and safety:

Dosing

• Osteoporosis treatment: 70 mg once weekly OR 10 mg once daily
• Osteoporosis prevention: 35 mg once weekly OR 5 mg once daily
• Paget's disease: 40 mg once daily for 6 months
• Glucocorticoid-induced: 5 mg once daily (10 mg daily for postmenopausal women not on estrogen)

The once-weekly 70 mg dose is by far the most commonly prescribed because it's easier to remember and equally effective.

How to Take It Correctly

This is where Alendronate differs from most medications. Follow these steps every time:

1. Take it first thing in the morning — before eating, drinking, or taking any other medications
2. Swallow it with a full glass (6-8 oz) of plain water only — not coffee, juice, tea, or mineral water
3. Do not crush, chew, or suck on the tablet — swallow it whole
4. Stay upright (sitting or standing) for at least 30 minutes — do not lie back down after taking it
5. Wait at least 30 minutes before eating, drinking anything other than water, or taking other medications

These instructions exist because Alendronate can irritate the esophagus if it doesn't move quickly to the stomach. Taking it correctly dramatically reduces the risk of esophageal side effects. For more on side effects, see our guide on Alendronate side effects.

Who Should Not Take Alendronate?

Alendronate is not right for everyone. You should not take it if you have:

• Esophageal abnormalities that delay emptying (such as stricture or achalasia)
• Inability to sit upright or stand for at least 30 minutes
• Hypocalcemia (low blood calcium) — this must be corrected before starting treatment
• Severe kidney impairment (creatinine clearance below 35 mL/min)
• Known allergy to Alendronate or any of its ingredients

Alendronate is also not recommended during pregnancy or breastfeeding due to potential risk to the fetus. It is not typically used in children.

If you have kidney problems, your doctor may recommend an alternative to Alendronate such as Denosumab (Prolia), which doesn't rely on kidney function for clearance.

How Much Does Alendronate Cost?

Alendronate pricing varies significantly depending on the pharmacy and whether you use insurance or a discount card:

• Generic Alendronate 70 mg (4 weekly tablets): $8 to $165 depending on the pharmacy
• With a GoodRx coupon: As low as $8.62
• Brand-name Fosamax: $300+ per month without insurance
• Brand-name Binosto: $200+ per month without insurance

Insurance Coverage

Generic Alendronate is widely covered by insurance:

• Medicare Part D: Typically Tier 1-2, with copays of $0-$15
• Commercial insurance: Usually covered as a preferred generic with no prior authorization required

Saving Money

If you're paying out of pocket, discount cards can save you a lot. GoodRx, SingleCare, BuzzRx, and Optum Perks all offer significant discounts on generic Alendronate. For a complete breakdown, see our guide on saving money on Alendronate.

Use Medfinder to compare prices at pharmacies near you and find the best deal.

How Long Do You Take Alendronate?

Most doctors recommend taking Alendronate for 3 to 5 years, then reassessing whether continued treatment is needed. This reassessment — sometimes called a "drug holiday" — is based on your current bone density, fracture risk, and overall health.

Some patients may benefit from longer treatment, while others can safely take a break. Your doctor will guide this decision based on follow-up DEXA scans and your individual risk factors.

Final Thoughts

Alendronate is a proven, affordable medication that has helped millions of people maintain stronger bones and avoid fractures. If your doctor has recommended it, following the dosing instructions carefully is the single most important thing you can do to get the most benefit with the fewest side effects.

Whether you're just starting Alendronate or considering it as an option, understanding how it works, how to take it, and what it costs puts you in a better position to manage your bone health.

Ready to fill your prescription? Search Medfinder to find Alendronate in stock at the best price near you.