We would need to know to your opioid tolerance , and benzodiazepines and opioids and can be a dangerous combo; I would stick 10-15mg Valium, it has a rapid onset, and it wears off surprisingly fast, so you can take another 7.5mg(or 5-10’) a couple hours after later, after Oxycodone peaks- still be careful- 29-30mg oxy and 15ng dzp(Dzp) is likely enough
Ne safe, you can take more, yet rarely less...