RxGuardian Inc. Keeps People Safe. Our tamper-evident abuse-deterrent technologies help prevent Diversion and Substance Use Disorders at the source. RxGuardian Inc. provides supply-side interventions that are easy and inexpensive to implement, including: Safer Lock: patented combination locking products including a locking pill bottle and locking medicine box. Rx Locking Cap: a patented combination cap that fits over standard pharmaceutical vials. RxGuardian Inc.’s product portfolio is available online, through our retail partners and as an insurance benefit.