The pharmaceutical supply chain is severely threatened by drug counterfeiting, which results in health risks and economic losses. Currently there are systems that use a single authority to manage the access called centralized access control systems. These systems are transparent and susceptible to unauthorized access and credential leaks. While blockchain guarantees data integrity and decentralization, public verifiability poses threats to sensitive data exposure. Novel contribution of the carried study is to introduce a blockchain-based secure drug supply chain framework that incorporates Lattice-Based Extended Bell-LaPadula (LEBLP) access control. LEBLP model assigns different clearance levels as well as categories to data objects and participants. It ensures only authorized and intended user to access the sensitive information which prevents the infiltration of the counterfeit’s drugs in the supply chain. Comparative analysis between various studies shows improved resistance to unauthorized access and security threats compared to current methods. The proposed framework is implemented using solidity smart contracts (Remix IDE) and has been deployed on the ethereum blockchain. The architecture is tested in ganache and truffle development environment which helped us in creating a local blockchain network and managing the smart contracts.