Alendronate Patient Tips
Medically reviewed on Nov 13, 2017 by C. Fookes, BPharm.
How it works
- Alendronate strengthens bones and may be used for the treatment or prevention of osteoporosis. Alendronate works by inhibiting osteoclasts which are responsible for breaking down and reabsorbing bone (by a process known as bone resorption). Alendronate strengthens bones by slowing down bone loss and allowing osteoblasts (bone building cells) to work more effectively, improving bone mass.
- Alendronate belongs to a group of medicines known as bisphosphonates.
- Alendronate is used in the treatment and prevention of osteoporosis in postmenopausal women and men.
- Alendronate may also be used to treat glucocorticoid-induced osteoporosis and Paget's disease of the bone.
- Alendronate may also be used to treat adverse skeletal effects caused by some cancers.
- Some studies have shown that alendronate may be more effective than risedronate at increasing bone mineral density and reducing bone turnover without a higher risk of side effects.
- Depending on the condition being treated and the dosage used, alendronate may be taken once daily or once weekly.
- Generic alendronate is available.
If you are between the ages of 18 and 60, take no other medication or have no other medical conditions, side effects you are more likely to experience include:
- Abdominal pain, bone muscle or joint pain, dyspepsia, hair loss, itch, constipation, diarrhea, flatulence, dizziness, headache, vertigo, and swelling of the ankles or feet are the most common side effects.
- Alendronate, like other bisphosphonates, may cause irritation of the esophagus and stomach. Some cases have been severe enough to warrant hospitalization. The risk is greater in people who lie down soon after taking alendronate or who don't take it with a full glass of water. Take exactly as directed. Alendronate should be taken with a full glass of water and the person taking alendronate should remain upright for at least 30 minutes after taking it.
- Severe bone, joint, or muscle pain, necessitating discontinuation of alendronate in some people, has been reported, occurring from one day to several months after starting the drug.
- Rarely may cause other side effects including uveitis (eye inflammation).
- May not be suitable for some people including those with kidney disease, pre-existing esophageal conditions, low blood calcium levels (hypocalcemia), or who are unable to stand or sit upright for at least 30 minutes.
- There are concerns about the long-term safety of bisphosphonates (such as alendronate) as long-term use has been associated with atypical femur fractures, osteonecrosis of the jaw and esophageal cancer.
- Fracture risk reduction may also persist for years after treatment has stopped. The optimal duration of therapy with alendronate has not been established. Periodically re-evaluate the need for therapy. Discontinuation of therapy should be considered by doctors after 3 to 5 years in patients at low risk of fracture.
- Alendronate may interact with antacids or supplements containing calcium or magnesium.
- Alendronate may lower calcium levels in the blood. Pre-existing low blood calcium levels should be corrected before alendronate administration.
Notes: In general, seniors or children, people with certain medical conditions (such as liver or kidney problems, heart disease, diabetes, seizures) or people who take other medications are more at risk of developing a wider range of side effects. For a complete list of all side effects, click here.
- Take alendronate at least 30 minutes before eating or drinking any food or beverages (other than water), or taking any other medication, including calcium, antacids or vitamins for the day.
- Take alendronate with a full glass of water and remain upright for at least 30 minutes. Do not lie down. Do not substitute water with mineral water, coffee, soda, juice or tea. Never take alendronate at bedtime. Take alendronate exactly as directed by your doctor. Do not increase or decrease the dosage without your doctor's advice.
- Avoid eating, drinking (other than water) or taking other medications for 30 minutes after taking alendronate.
- Dissolve alendronate effervescent tablets in 4oz of room temperature tap water. Wait 5 minutes after effervescence stops before stirring for 10 seconds then drinking.
- You may need to take supplementary calcium or vitamin D if your dietary intake is inadequate. Your doctor will advise you on this. If you are taking supplemental calcium, iron, magnesium, or antacids, take them at a different time of day to alendronate (for example at lunchtime), as they may interfere with the absorption of alendronate. Note that mineral water may contain a higher concentration of calcium than tap or bottled water, and you should only drink if your doctor has confirmed it is compatible with alendronate.
- Talk to both your dentist and doctor if you require dental surgery or a tooth extraction and you have been on alendronate long-term. They may advise discontinuation of alendronate.
- Tell your doctor if you experience any thigh or groin pain, muscle cramps or twitches, severe or debilitating muscle pain, eye inflammation, or any other adverse effects of concern while you are taking alendronate.
Response and Effectiveness
- Alendronate starts to affect markers that reflect bone resorption within one month of treatment and reaches a plateau by three to six months. Effects remain stable following continued treatment for up to three years.
- Food can significantly decrease the absorption of alendronate.
- Alendronate [Package Insert]. Revised 09/2017. Aidarex Pharmaceuticals LLC. https://www.drugs.com/pro/alendronate.html
- Eriksen EF, Díez-Pérez A, Boonen S. Update on long-term treatment with bisphosphonates for postmenopausal osteoporosis: a systematic review. Bone. 2014 Jan;58:126-35. doi: 10.1016/j.bone.2013.09.023. Epub 2013 Oct 9
- Reid, DM, Hosking, D, Kendler, D, et al. A comparison of the effect of alendronate and risedronate on bone mineral density in postmenopausal women with osteoporosis: 24-month results from FACTS-International. International Journal of Clinical Practice 2008;62:575-84. doi:10.1111/j.1742-1241.2008.01704.x
More about alendronate
- Side Effects
- During Pregnancy or Breastfeeding
- Dosage Information
- Drug Images
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- Compare Alternatives
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- En Español
- 31 Reviews – Add your own review/rating
- Drug class: bisphosphonates
- Alendronate Effervescent Tablets
- Alendronate Tablets
- Alendronate Oral Solution
- Alendronate (Advanced Reading)
Related treatment guides
- Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use alendronate only for the indication prescribed.
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