Jackley said Tuesday that Circuit Court Judge Mark Barnett denied a request to have his office rewrite the explanation.
Drug companies challenged the explanation.
In a statement, Jackley says he has "worked to provide a fair, clear, and simple summary" of the measure to assist voters. Jackley says his role is not to advocate for or against a ballot measure.
Supporters of the measure hope to put the initiative before voters in 2018. The proposal would impose a price limit on state drug purchases at the lowest price paid for the same drug by the U.S. Department of Veterans Affairs.
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South Dakota Attorney General Marty Jackley says a judge has upheld his explanation of a proposed ballot measure that would cap the amount state agencies could pay for prescription drugs.