Drugs, Prescription - As introduced, requires the comptroller of the treasury to study the process utilized by the state to purchase prescription drugs by looking at the role of pharmacy benefits managers, the role of co-payments in drug costs to the consumer and the state, and the desirability of a bid process approved by the general assembly; requires the comptroller to report to the health committee of the house of representatives and the health and welfare committee of the senate on or before January 15, 2019. - Amends TCA Title 4; Title 8; Title 56 and Title 71.