Simplify the following text for a Grade 9 native English-speaking person.
Original: Codeine hydrochloride is more commonly marketed in continental Europe and other regions , and codeine hydroiodide and codeine citrate round out the top five most-used codeine salts worldwide . Codeine is usually present in raw opium as free alkaloid in addition to codeine meconate , codeine pectinate , and possibly other naturally occurring codeine salts .
Simplified: Codeine can be extracted from opium .