The Effects of Re-challenge in Patients with a History of Acute Anterior Uveitis Following Intravenous Zoledronate.

To determine the incidence of adverse ocular side effects following re-challenge in patients who previously developed ocular symptoms following intravenous zoledronate. Secondary data analysis of a large, prospective, randomized, double-blind, placebo-controlled clinical trial was performed. Participants consisted of postmenopausal females with osteopenia randomized to placebo (N = 1000) or zoledronate 5 mg (N = 1001) intravenous infusion. Recruitment occurred over a 2-year period, with the first infusion being administered at recruitment, and subsequent infusions every 18 months. Eight participants developed acute anterior uveitis (AAU) (diagnosed by an ophthalmologist) following the first infusion of zoledronate. Following appropriate ophthalmic treatment, no patients had visual loss or other ocular sequelae. One further participant reported "sore red eyes" but did not attend for ophthalmology review. Six participants declined further infusions. The remaining three participants were administered two further zoledronate infusions, 18 months apart, and none developed any ocular symptoms following each infusion. As a precaution, two of these participants were examined by an ophthalmologist 3 days after their second infusion and neither had ocular symptoms or signs of AAU and no subsequent ocular side effects. AAU following zoledronate infusion is likely to be part of the acute phase response. If treated promptly under the care of an ophthalmologist, the visual prognosis is excellent. The results of this study suggest that the development of AAU should not be a contraindication to further infusion. However, in such cases, patients should be warned of the symptoms of AAU (ocular pain, redness, photophobia or blurred vision) and should be promptly referred to an ophthalmologist if symptoms develop.