Order Link : https://careskit.com/product/opana-er-10-mg/ A pharmaceutical stimulant made of amphetamine salts, OPana ER 10 mg is used to treat severe pain. It improves focus and alertness by raising dopamine and norepinephrine levels in the brain. In addition to having a significant potential for abuse and dependence, Opana ER can raise heart rate, induce anxiety, and cause insomnia.