No. discount on LSD stamps is Lysergic acid Dethylamide. In it's pure laboratory form it's just what it is -- pure LSD.

Street LSD is often cut with other drugs, most notably amphetamines and other stimulants. This happens when the stimulant is less pricey than the LSD, so less LSD can be used with similar effects, as stimulants tend to "enhance" the trip.

Codeine is a completely unrelated medication that has no perceived interaction with LSD.