Offer valid only on the following ZYRTEC products : ZYRTEC 10mg Tablets 3, 5, 14, 30 or 40 count sizes; ZYRTEC 10mg Liquid Gels 12, 25 or 30 count sizes; any Childrens ZYRTEC; any ZYRTEC-D.

A refund check will be issued for the actual price paid in cash or cash equivalent excluding product shipping and handling charges. Purchases using rewards points are not reimbursable. The cost of first class postage stamp will be reimbursed in refund check. Offer open to U.S. residents only. Limit one (1) refund per household (except in Rhode Island). All refund requests must be postmarked by 2/28/2013.

http://www.zyrtec.com/satisfaction-guarantee