Hello @123suew,

I agree that you are probably talking about Fosamax which is used to treat osteoporosis. Here is some information from WebMD. WebMD is a user-friendly website for laypeople who have questions about medical matters.
https://www.webmd.com/drugs/2/drug-1273-7174/fosamax-oral/alendronate-oral/details.
If you read the article you will see that there are some side-effects. With every med that each of us takes, there are side-effects. Not all of us will get one or all of the side-effects. We have to decide individually how much we are willing to risk the side-effects or risk the results of not taking them (i.e. fractures, etc.)

I recently started taking a med, Actonel, on a once a month basis. This too is a med used to stop additional bone loss. While there are side-effects I'm willing to try it because I fear fracturing a hip more than the side-effects of the med.

It really is a personal decision. It is important to do your own due diligence. By this I mean, to read all you can about the side-effect as well as the benefits of the drugs and to talk with your doctor and then make the best decision you can for your well-being.