At 59-1/2 years, I was diagnosed with osteoporosis. My OB/GYN immediately put me on Fosamax. I took my first pill on Sunday morning, following directions to a T. Within an hour and for the next 13 hours, I have felt like a Mack Truck hit me. My nausea is unstoppable. I was dizzy earlier today and have had a dull headache all day. I am done with this drug. I'm calling my internist tomorrow and asking for non-drug alternatives. I'll do ANYTHING BUT TAKE THIS DRUG EVER AGAIN—even after just one dose! After reading all of these consumer reviews, there needs to be more warnings about this powerful drug.