California Welfare And Institutions Code Section 14105.436

(a) Effective July 1, 2002, all pharmaceutical manufacturers shall provide to the department a state rebate, in addition to rebates pursuant to other provisions of state or federal law, for any drug products that have been added to the Medi-Cal list of contract drugs pursuant to Section 14105.43 or 14133.2 and reimbursed through the Medi-Cal outpatient fee-for-service drug program. The state rebate shall be negotiated as necessary between the department and the pharmaceutical manufacturer. The negotiations shall take into account offers such as rebates, discounts, disease management programs, and other cost savings offerings and shall be retroactive to July 1, 2002. (b) The department may use existing administrative mechanisms for any drug for which the department does not obtain a rebate pursuant to subdivision (a). The department may only use those mechanisms in the event that, by February 1, 2003, the manufacturer refuses to provide the additional rebate. (c) In no event shall a beneficiary be denied continued use of a drug that is part of a prescribed therapy and that is the subject of an administrative mechanism pursuant to subdivision (b) until the prescribed therapy is no longer prescribed.