There can be serious side effects, and less serious side effects. There is a web site about it. It is non-commercial, so I hope it is not deleted, and is dontfixit.org . Yes, this is a site produced by those who have had problems, so you will hear all about the bad things that can happen.
Anyway, you might read that web site and make an informed decision about what to do. Many men have no problems, and some have minor issues that they never even bother to report to the doctor. Note, too, that there are problems with women getting their tubes tied, so it seems that any kind of birth control has risks. A vasectomy might be the lowest risk thing to do, so don't let the web site overly scare you.
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