Get emergency medical help if you have signs of an allergic reaction to Fosamax: hives; wheezing, difficulty breathing; swelling of your face, lips, tongue, or throat.
Stop using Fosamax and call your doctor at once if you have:
chest pain, new or worsening heartburn;
difficulty or pain when swallowing;
pain or burning under the ribs or in the back;
severe heartburn, burning pain in your upper stomach, or coughing up blood;
new or unusual pain in your thigh, hip or groin;
jaw pain, numbness, or swelling;
severe joint, bone, or muscle pain; or
signs of low calcium levels - muscle spasms or contractions, numbness or tingly feeling (around your mouth, or in your fingers and toes).
Common Fosamax side effects may include:
heartburn, upset stomach;
stomach pain, nausea;
diarrhea, constipation; or
headaches; or
bone pain, muscle or joint pain.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
 Fosamax side effects (more detail)
