- Current treatment or treatment within 4 weeks of screening with drugs known to reduce serum calcium levels, including: bisphosphonates, antiepileptic drugs, cinacalcet, macrolide antibiotics (such as erythromycin, azithromycin), large doses of corticosteroids (>20 mg/day of prednisone or equivalent), or any IV use of corticosteroids. In addition, long-term use (defined as ongoing use for ≥4 weeks) of corticosteroids within 8 weeks of screening is prohibited