CVS does not provide a specific policy anywhere on their page. Here is the response I received via email after several repeated attempts:
Our registers are set to allow 1 CVS coupon and 1 manufacturer coupon per item. Free coupons or “offers at the register” (OAR’s) are unearned and issued to you as a valued member of the CVS/pharmacy ExtraCare program. These coupons take the form of “open ended” coupons such as $3 off $15 or a certain dollar amount off a specific item. In any given transaction our registers will allow only one “open ended” coupon per transaction. CVS Extra Buck coupons are earned when you make a qualifying purchase. These print out instantly at the register upon reaching the threshold for the offer. You can use more than one Extra Buck coupon provided the purchase threshold has been met for each offer amount on a per-transaction basis.
In the case where a particular item is on sale for “buy one get one free” (BOGO), you are only allowed to use one manufacturer’s BOGO coupon. For instance, if Revlon lipstick is on sale for BOGO, you can use one manufacturer’s BOGO coupon. You would get both items free and pay any applicable tax. We reserve the right to limit quantities after the first purchase. If our store is running a sale for BOGO, you can use two manufacturer’s coupons for a specific dollar amount off. For example, if Revlon lipstick is on sale at our store for BOGO, you can use two $1.00 off Revlon lipstick manufacturer coupons.
CVS/pharmacy does accept manufacturers’ coupons that have been obtained from manufacturer sponsored and/or authorized Web sites. The coupon should be complete and contain a bar code that can be scanned at the register. If the coupon does not scan, the cashier should politely inform you that we cannot accept your coupon. We do not allow manual overrides at the register for coupons printed from the Internet. CVS/pharmacy will not accept offers printed from unauthorized Internet postings or reproductions, copies, or facsimiles.
We do not accept competitors’ coupons for front store items. We feel that our sales and ExtraCare program are comparable if not better than any sales or coupons offered by our competitors. We also do not accept any expired coupons, CVS or otherwise. We do not “double” or “triple” coupons.
Again, thank you for contacting us. We value your business and look forward to serving you in the future.