Certain types of drugs are quite strictly controlled, even moreso than in the USA. Valium type drugs would be a good example. They have a computerized system to control 'psychotropics' here. There are ways to get around this if you're willing to pay for a Dr visit, but that's true in the USA too. You can get codeine mixed with acetomenaphen over the counter, but stronger pain killers are also restricted.
If you are just looking for antibiotics, anti cholestorol or acid reflux medicines, you can get them all over the counter. If you are looking to catch a 'buzz' it's not much different than back in the States.
"The only normal people are those you don't know very well." Joe Ancis