Osteoporosis Patients: Want To Take a Drug Holiday from Bisphophonates?

As reported in Medical Xpress, researchers are studying how patients using bisphosophonates as part of a treatment regime to avoid fractures associated from osteoporosis are affected by “drug holidays” when patients take hiatuses from the drug in order to mitigate potentially negative consequences and side effects of prolonged, uninterrupted drug use. Scientists at Ruhr University Bochum in Germany have published research in the journal Bone, studying the effect of these ‘drug holidays’ on the user’s risk for such fractures. The researchers found that drug holidays put patients who had already experienced a vertebral fracture at greater risk for major osteoporotic fractures (those of the spine, hip, shoulder, or forearm). However, those who had not had a vertebral fracture did not experience a significant change in risk.

A Hiatus from Bisphosphonates

Their research, which collected information from 1,973 patients across Germany, found that patients that took drug holidays who had already developed symptoms lost some it’s protection, which lessens the risk for fractures. They explain,
“In patients who had already had vertebral fractures, the risk of major osteoporotic fractures (MOFs) for a time of more than 12 months since the therapy was paused increased 3.5 times compared to the risk in the second half of the first year of the drug holiday.”
This means the patients who had experienced fractures after a year of pausing the treatment had their risk for fractures increase significantly, compared to those who had only been on pause from the treatment for six months. However, for those who were not already experiencing fractures, the risk was significantly lower:
“A prevalent vertebral fracture may increase the relative risk of MOFs associated with a longer BP holiday.”
 Some patients who had been taking the treatment for extended lengths were also shown to be at greater risk of the potentially more impactful, albeit rare, side effects. This includes fractures of the thigh, the jaw developing osteonecrosis, and various damage to bones. They also found that the effects of long term use of the drug endures after the patient ceases to take it. To measure the risk, they created a detailed analysis that found the relationship between the time lapsed since ending the treatment and the moving average of the fracture rates. This was to help mitigate the statistical bias as many of the patients who took drug holidays were similarly often those experiencing the least severe cases earlier.
The head author of the study, Johannes Pfeilschifter, said,
“The findings of our study should be considered in the context of all study reports on long-term therapy with bisphosphonates and bisphosphonate drug holidays. The decision regarding further management of osteoporosis in patients on bisphosphonate therapy should be made individually for each patient based on the benefits and potential risks of the available treatment options, and should be re-evaluated on a periodic basis.”

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