What are side effects from taking alendronate/fosamax for osteoporosis?

See below: All meds may have potential side effects. Fosamax (alendronate) most common side effects such are abdominal pain, muscle or joint pain, fli-like illness, constipation, diarrhea, dizziness, headache, nausea, vomiting. Very rare of all similar type drugs are fractures of the femur and a rare condition called avascular necrosis of the jaw, which is dead bone in the jaw after significant jaw/dental surgery.