House Bill 836 amends provisions of the Occupations Code relating to the disclosure of certain prescription drug price information by a pharmacist. The bill requires a pharmacist to offer a patient the option of paying the lower of the price of a drug prescribed to the patient or the cost of the patient's insurance copayment. The bill also requires a pharmacist, before filling a prescription, to inform a patient that a less expensive generically equivalent drug is available as a substitute for a brand prescribed and to ask the patient to choose between the generic and the branded drug. House Bill 836 provides for certain exceptions to the disclosure requirements and for compliance by a pharmacy that supplies a prescription by mail.