Most people take alendronate sodium tablets for 5 years before their doctor reassesses whether to continue or pause treatment. For those at high risk of fractures, treatment may extend up to 10 years or longer. The right duration depends on your bone density, fracture history, and age.
The Standard 5-Year Treatment Window
Five years of oral alendronate is the benchmark treatment period recommended by the American Society for Bone and Mineral Research. At that point, your doctor should reassess your fracture risk to decide whether you should keep taking the medication, switch to something else, or take a break. This reassessment typically involves a bone density scan and a review of any fractures you’ve had during treatment.
Some people with milder osteoporosis may be reassessed as early as 3 years. If your bone density has stabilized and you haven’t broken any bones, continuing beyond 5 years may not add much benefit for you, and pausing treatment becomes a reasonable option.
When Treatment Extends to 10 Years
If you’re considered high risk after 5 years of treatment, guidelines recommend continuing alendronate for up to 10 years total. You’re generally considered high risk if you meet criteria like these:
- Fracture history: You’ve broken a hip, spine, or multiple bones before or during treatment.
- Very low bone density: Your hip T-score is still below -2.5 after 5 years of therapy.
- Age: You’re over 70.
- High fracture probability: Your calculated 10-year fracture risk remains above 20%.
For patients with multiple spinal fractures or persistently very low bone density despite treatment, some guidelines recommend continuing indefinitely, on the basis that the benefits of preventing fractures outweigh the small risks of long-term use.
What a Drug Holiday Means
A “drug holiday” is a planned break from alendronate, not a permanent stop. The concept works because alendronate binds tightly to bone and stays there for a remarkably long time. Its half-life in human bone tissue exceeds 10 years, meaning the medication continues to slowly release from your skeleton and provide some protection even after you stop taking it.
A drug holiday is typically considered if, after 5 years of treatment, you haven’t had any major fractures and your hip bone density T-score is better than -2.5. Your doctor will generally reassess your bone density 2 to 3 years after stopping to check whether you’re losing bone quickly. If your bone density drops significantly, a new fracture occurs, or something changes your risk (like starting steroid medications or having more falls), treatment should restart.
Drug holidays usually last 2 to 3 years, though some lower-risk patients may go longer between reassessments. When restarting, your doctor will likely do a full risk assessment as if you were starting from scratch.
Why Treatment Isn’t Indefinite for Everyone
The reason doctors don’t simply keep everyone on alendronate forever is that two rare but serious side effects become more likely with extended use.
The first is atypical femur fracture, an unusual break in the thighbone that occurs with little or no trauma. This complication is extremely uncommon in the first 3 years of treatment but rises to roughly 113 cases per 100,000 patient-years after 8 years of use. These fractures are still rare in absolute terms, but the risk climbs the longer you take the drug.
The second is osteonecrosis of the jaw, where a section of jawbone loses its blood supply and begins to deteriorate. For people taking oral alendronate for osteoporosis, the overall prevalence is about 0.34%. The risk increases with treatment duration: it ranges from 0.04% after 1 year to about 2.14% after 8 years. Tooth extraction dramatically raises the risk. Among people who had a tooth pulled while on alendronate, the rate jumped to 2.16%, compared with 0.21% in those who didn’t. If you need dental surgery while taking alendronate, make sure your dentist knows.
For most patients at moderate or lower fracture risk, the calculus shifts after 5 years. The lingering protective effect of alendronate stored in bone means you can take a break while still reducing your chance of fractures, and you avoid accumulating risk for these rare complications.
How Your Progress Is Monitored
Bone density scans are the primary tool for tracking whether alendronate is working and whether it’s safe to pause. During active treatment, scans are typically done every 2 to 3 years. After stopping alendronate for a drug holiday, a follow-up scan at the 2- to 3-year mark helps determine whether your bone density is holding steady or declining.
If a scan shows rapid bone loss during a holiday, or if you fracture a bone, that signals it’s time to resume treatment or consider a different medication.
Taking Alendronate Correctly While You’re On It
However long your treatment lasts, taking alendronate correctly matters. The medication is poorly absorbed and can irritate your esophagus if it doesn’t reach your stomach quickly.
Take it first thing in the morning, before eating or drinking anything. Swallow the tablet with a full glass of plain water (6 to 8 ounces). Don’t lie down for at least 30 minutes afterward, and don’t eat, drink, or take any other medications, including vitamins or antacids, during that 30-minute window. Sitting or standing upright helps the tablet reach your stomach and reduces the chance of irritation.
These steps apply whether you take the daily or weekly formulation, and they stay the same for the entire duration of your treatment.