Menu Close

Alendronate

Supportive Care

clipboard icon

What is alendronate?

Alendronate (also called Fosamax®) is a medicine that treats or prevents osteoporosis (weak or brittle bones). This medicine is available as 5 mg, 10 mg, 35 mg, 40 mg, and 70 mg tablets. All are taken by mouth.

How to take and store alendronate

  • Your doctor can order this medicine to be taken daily or one time a week. Read the directions on the bottle carefully to make sure you take this medicine correctly. Always take the tablet in the morning. If ordered to take it one time a week, take it on the same day each week.
  • Store the medicine at room temperature in a closed container, away from moisture and light.
exclamation mark in a circle icon

Possible side effects

  • Stomach pain (either aching or burning)
  • Muscle, bone, or joint pain
  • Headache
  • Trouble swallowing, painful
  • Nausea, diarrhea, constipation, gas

Symptoms of an allergic reaction include: rash, hives, itching, chills, fever, headache, muscle ache, shortness of breath, coughing, tightness in the throat, swelling of the face or neck.

Not all patients who take alendronate will experience these side effects. Common side effects are bolded, but there may be others. Please report all suspected side effects to your doctor or pharmacist.

Find more information on side effects.

family icon

Tips for patients and families

Be sure to discuss all questions and instructions with your doctor or pharmacist. 

  • If any of this medicine stays in the esophagus, it may cause serious damage. The esophagus is the tube that carries food and drink from your mouth to your stomach when you swallow. To lower the risk of this problem, take the tablets exactly as directed.
  • Take this medicine as soon as you get out of bed in the morning, before you eat or have anything to drink. Swallow the tablet whole with a large glass of plain water only. Do not chew or suck on the tablet. Do not take the medicine while you are still in bed, and do not take at bedtime
  • Wait at least 30 minutes after you swallow the tablet before you eat or drink anything or take any other medicines
  • Do not lie down for at least 30 minutes after taking this medicine, and do not lie down before you have eaten some food.
  • Your doctor may order calcium and vitamin D supplements if your body is not getting enough calcium from your diet. You should wait to take this and any other medicines at least 30 minutes after alendronate.
Print This Page

Always check the medication label. Many medicines look the same. Do not take any new medicine, including over-the counter medicines or supplements, without checking with your doctor or pharmacist. Talk to your doctor or pharmacist about what to do in the case of a missed dose, allergic reaction, or medical emergency. 

This information is not intended to be a complete guide and is not a substitute for talking with your provider. Medicine names, appearance, formulas, or availability may vary by clinic location. Always follow the instructions given by your care team.

—
Reviewed: