beckyc- Yes, I think that the side effects of Forteo and Tymlos are considered the same. Both carry the same restriction not to use more than two years. Both use the same basic mechanism-- PTH (parathyroid hormone) analogs. Forteo has been out longer. Tymlos is considered easier to use, because you do not have to keep it in the refrigerator after the first use. Both come in 30 day injector pens. The two-year limit is I think the result of the increased risk of osteosarcoma in a two-year study of rats. You can compare the side effect descriptions in the package inserts, which are online.