Clinician: Patients with immune system disorders are usually treated with a class of drugs that, unfortunately, increase the patient' s risk of developing osteoporosis, a bone-loss disease  So these patients take another drug that helps to preserve existing bone
Since a drug that enhances the growth of new bone cells has now become available, these patients should take this new drug in addition to the drug that helps to preserve existing bone
To what extent does the new drug retain its efficacy when used in combination with the other drugs.