Subchronic and chronic toxicity In the intravenous infusion studies, renal tolerability of zoledronic acid was established in rats when given 0.6 mg/ kg as 15-minute infusions at 3-day intervals, six times in total (for a cumulative dose that corresponded to AUC levels about 6 times the human therapeutic exposure) while five 15-minute infusions of 0.25 mg/ kg administered at 2– 3-week intervals (a cumulative dose that corresponded to 7 times the human therapeutic exposure) were well tolerated in dogs.