Who can I contact if I have any additional questions? December 16, 2024 18:19 Updated Please contact the OTC Fulfillment Center Monday - Friday from 8 a.m. - 8 p.m. ET at 1-800-560-9712 (TTY 711). Related articles Where can I find my available allowance? Can I order more than my available allowance worth of OTC products in a single order and cover the remaining charges myself?