with your doctor's permission, you can switch around. I was going from the Tymlos to the Prolia. But decided I would stick it out with the Tymlos. My side effects all stopped after 3 months. I told them I wouldn't change because of my research that Tymlos was superior and there are consequences with the Prolia which made me not want to go forward with that. The injections everyday are very easy for me. They even make a EXTRA FINE needle they don't include but could be requested. Good luck!