A sealed pharmaceutical container comprises a shoulder, a neck extending from the shoulder, and a flange extending from the neck. The flange comprises an outer surface extending from the underside surface and a contact surface extending between the outer surface and an inner surface defining an opening in the sealed pharmaceutical container. The contact surface comprises an outer peripheral edge disposed proximate to the outer surface of the flange. The sealed pharmaceutical container comprises a sealing assembly comprising a stopper extending over the contact surface of the flange and covering the opening, and a cap securing the stopper to the flange. The stopper comprises a sealing surface that is secured in contact with the contact surface of the flange to form a seal between the flange and the stopper. An outer peripheral edge of the sealing surface is disposed at or radially inward of the outer peripheral edge.