A large concern in U.S. opioid policy is whether supply side controls are effective at reducing the quantity of opioids prescribed, without harmful substitution. An unstudied way that policy targeted a major opioid through the federal Controlled Substance Act (CSA) was the August 2014 scheduling of tramadol products, the second most popular opioid medication at the time. Twelve states implemented the identical policy prior to federal action, providing a unique opportunity to compare effectiveness of the same opioid policy at state versus federal levels. This is important because many recent opioid policy interventions have only taken the form of state actions, while federal policy has largely been advisory. Seven weeks after tramadol's scheduling, the leading opioid form on the market, hydrocodone combination products, was move to the more restricted level II (no refills allowed) from level III in the CSA, allowing us to test a new question in the opioid literature: competitive spillover effects from regulations targeting one drug. Using weekly prescription data spanning 2007-2017, this study finds that tightening prescribing restrictions on one opioid leads to decreases in its use, but also causes some increases in prescriptions of close competitors, leading to no statistically detectable short-run reduction in total opioid prescriptions.