We recommend checking RxSpark and getting a new voucher before filling any prescription. Prices vary month to month, so a different pharmacy or new voucher may save you more money than the one used for your last prescription.
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Once a voucher is used it may be kept on file at your pharmacy of choice, but this information may be cleared occasionally, so a new voucher may be required to get a discount. Consequently, we advise RxSpark users to print out a new voucher for each fill or refill.