There are 4 names in this directory beginning with the letter O.
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A class of depressant drugs. Natural opioids include heroin, opium, morphine and codeine. Synthesized opioids include fentanyl, tramadol, and many more.
From the opium poppy. The extract is used to make morphine which is chemically made to heroin. Street names include Big O, black stuff, block, gum and hop.
a semi-synthesized drug from the Persian poppy. It can be taken by pill (mouth), sublingual (under the tongue), intramuscular (into a muscle), intravenous (into a vein), intranasal (nose), subcutaneous (under the skin), and transdermal (skin patch). The pill form can be crushed and injected.