If you forgot your weekly Fosamax, take one dose the next morning after you remember, then go back to your usual weekly day. Do not take it later the same day you remember, and never take two tablets to make up for the missed one. The once-a-week schedule is exactly why it is so easy to lose track.
Medical disclaimer: This article is general information about Fosamax and is not medical advice.
The exact rule for a missed weekly dose
Fosamax (alendronate) is usually taken once a week, and the catch-up rule is specific. According to MedlinePlus: "If you miss a dose of once-weekly alendronate, take the dose the morning after you remember. Then return to taking one dose once each week on your regularly scheduled day."
Take it the next morning, not that evening, because Fosamax has to be taken first thing on an empty stomach. Take only one, even if you missed last week entirely.
| Situation | What to do |
|---|---|
| Remembered later the same day | Wait. Take one dose the next morning on an empty stomach |
| Remembered days later | Take one dose the next morning, then resume your usual day |
| Missed a whole week | Still just one dose. Never double up |
| Not sure if you took this week's | Check your log. If you still can't tell, ask your pharmacist before you take a tablet |
Re-do the full routine when you catch up
Because the catch-up dose still has to be taken correctly, run through the same Fosamax ritual the FDA label requires:
- First thing in the morning, before any food, drink, or other medicine.
- Swallow it whole with a full glass (6 to 8 ounces) of plain water only, never coffee, tea, juice, milk, or mineral water. Do not chew or suck on the tablet.
- Stay upright, sitting or standing, for at least 30 minutes and until after your first food of the day.
- Wait at least 30 minutes before your first food, any drink other than plain water, or other medicine.
If you get chest pain, new or worsening heartburn, or trouble or pain when you swallow, the label says to stop taking Fosamax and call your doctor right away. For the details on these steps, see our guide on how long to stay upright and wait to eat after Fosamax and why it needs a full glass of plain water.
Why weekly pills are so easy to miss
The label says to choose the day of the week that best fits your schedule. If you ever find yourself asking "wait, did I take it this week?", here is what to do when you cannot remember whether you took your medication. Daily pills can raise the same worry, as with a missed dose of tamoxifen. Monthly bone pills raise the same problem in a different shape, so if you take that instead, see the missed dose of Boniva catch-up rule.
If you are unsure how long it has been or you keep missing doses, tell your doctor or pharmacist rather than guessing. Steady use matters: MedlinePlus says it may take 3 months or longer before your bone density begins to increase, and to keep taking alendronate even if you feel well. If you get Prolia shots instead of a pill, here is how late you can get your Prolia shot.
How Pillo handles the weekly slot
A persistent weekly alarm tied to one fixed morning, plus a log you can check, turns "did I take it this week?" into a glance instead of a guess.
With Pillo, you set Fosamax for the same morning each week, and the alarm keeps reminding you until you confirm the dose, so the weekly dose is harder to forget. You can download Pillo on Google Play to keep your weekly bone medication on track.
Frequently Asked Questions
What do I do if I miss my weekly Fosamax dose?
Take one dose the morning after you remember, then go back to your regular weekly day. The Fosamax label says not to take a missed dose later in the day and not to take 2 doses on the same day. MedlinePlus adds that you should never take a double dose to make up for a missed one.
Can I take two Fosamax tablets if I missed a week?
No. Even if you missed a full week, take only one dose the next morning and resume your normal schedule. The label lists low blood calcium, low blood phosphate, and stomach or esophagus problems such as heartburn and ulcers among the possible results of an overdose. If you already took two at once, the label says to call your doctor, not to try to vomit, and not to lie down, and MedlinePlus says to drink a full glass of milk and call poison control. See what to do after a double dose of Fosamax.
Why can't I just take the missed Fosamax later today?
Because Fosamax must be taken first thing in the morning on an empty stomach, with plain water, followed by staying upright. Taking it later in the day after eating breaks those rules, so the catch-up dose waits until the next morning.
How do I stop forgetting my weekly osteoporosis pill?
Anchor it to the same morning every week and use a reminder that you have to confirm, plus a log you can check. That way the answer to "did I take it?" does not depend on memory.
Does missing one Fosamax dose hurt my bones?
The label handles a single missed dose with a catch-up rule: one tablet the next morning, then back to your usual day. MedlinePlus says it may take 3 months or longer before your bone density begins to increase. If you miss doses often, tell your doctor or pharmacist so your plan stays on track. If you also take an aromatase inhibitor such as anastrozole, keep an eye on both schedules and read what to do after a missed dose of anastrozole.
Medical disclaimer: This information is general and educational. It is not a substitute for professional medical advice and cannot account for your health history. Consult your doctor or pharmacist for advice specific to your medications.
