After taking Fosamax, 70 mg once weekly for four months, I awoke one morning with vertigo. My husband had to assist me from the bed to the bathroom. The dizziness and vertigo lessened to where I could walk unassisted but could not do floor exercises because lying flat caused the room to spin and nausea that continued for hours afterwards. I also got heart palpitations, coldness, and malaise, usually a couple of hours after taking the medication. The vertigo continued for three months until I got off Fosamax. I am now taking strontium citrate, 680 mg daily. I buy it on-line from *******, but it can also be purchased at your local health food store. Strontium, in the form of strontium ranelate, is prescribed in several countries, including some in western Europe. Reports I have read claim strontium in any form will reverse osteoporosis.