CA SB835

Prohibits the Secretary of Food and Agriculture from registering medically important antimicrobial drugs administered to food animals through feed or drinking water unless they comply with FDA Guidance for Industry #213 (dated December 2013).

Requires manufacturers to remove production use indications (such as "increased rate of weight gain") from drug labels and change marketing status from over-the-counter to veterinary prescription or veterinary feed directive.

Mandates that medically important antimicrobial drugs can only be used to treat, prevent, or control disease under veterinarian supervision or prescription within an established veterinarian-client-patient relationship.

Allows currently registered drugs that do not meet the new requirements until January 1, 2017, to reregister in compliance, with provisions for FDA-related delays in implementation.

Creates criminal penalties for violations; no state reimbursement to local agencies required as the costs stem from creating new crimes under existing provisions.