Not Medical Advice: The round, green pill with "E 20" on it is Opana ER, 20 milligrams. Opana ER is a pain reliever, in the drug class known as narcotic analgesics. The generic name of Opana ER is "oxymorphone." It's also marketed under the brand names "Numorphan" and "Numorphone." The "ER" in the name signifies that it's an extended-release medication.
It's considered a medication that has a high potential for abuse. It's considered extremely dangerous to drink alcohol while taking Opana, as this can lead to overdose.
There is also a round, yellow pill with "E 20" on it. This pill is Mirtazapine, in the dose of 15 milligrams. Mirtazapine is a tetracyclic antidepressant that is primarily used to treat depression and other similar mood disorders. It can also be used to treat anxiety, insomnia, hot flashes, and post traumatic stress disorder. It's sometimes prescribed as an appetite stimulant as well.