The national drink is Koskenkorva or Kossu
Alcohol is very expensive in Finland compared to most countries (though not to its Nordic neighbours Sweden and Norway), although low-cost Estonia's entry to the EU has forced the government to cut alcohol taxes a little. The legal drinking age is 18 for milder drinks, while to buy hard liquor from Alko you need to be 20.
Vodka in Finland
Surprisingly enough, the national drink is not Finlandia Vodka, but its local brand Koskenkorva or Kossu in common speech. However, the two drinks are closely related: Kossu is 38% while Finlandia is 40%, and Kossu also has a small amount of added sugar, which makes the two drinks taste somewhat different. There are also many other vodkas (viina) on the market, most of which taste pretty much the same, but look out for Ström, "The Spirit of Santa", a Finnish attempt at a super-premium vodka.
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Salmiakki-Kossu or Salmari shots
A local speciality is Salmiakki-Kossu or Salmari, prepared by mixing in salty black salmiakki licorice, whose taste masks the alcohol (Koskenkorva - distilled grain alcohol) behind it fearfully well. Add in some Fisherman's Friend menthol cough drops to get Fisu ("Fish") shots, which are even more lethal. In-the-know hipsters opt for Pantteri ("Panther"), which is half and half Salmari and Fisu. Other classic shots are Jaloviina (Jallu) cut brandy and Tervasnapsi "tar schnapps" with a distinctive smoke aroma.
Beer in Finland
Beer (olut or kalja) is also very popular, but Finnish beers are mostly nearly identical, mild lagers: common brands are Lapin Kulta, Karjala, Olvi, Koff and Karhu. Pay attention to the label when buying: beers branded "I" are inexpensive but has low alcohol content, while "III" and "IV" are stronger and more expensive. In normal shops you will not find any drinks with more than 4.7% alcohol. You may also encounter kotikalja (lit. "home beer"), a dark brown beer-like but very low-alcohol beverage. Imported beers are available in bigger grocery stores, most pubs and bars, and Czech beers in particular are popular and only slightly more expensive.
Cider in Finland
The latest trend is ciders (siideri). Most of these are artificially flavored sweet concoctions which are quite different from the English or French kinds, although the more authentic varieties are gaining market share. The ever-popular gin long drink or lonkero (lit. "tentacle"), a prebottled mix of gin and grapefruit soda, tastes better than it sounds and has the additional useful property of glowing under ultraviolet light.
Glögi in Finland
During the winter don't miss glögi, a type of spiced mulled wine served with almonds and raisins which can easily be made at home. The bottled stuff in stores is usually alcohol free, although it was originally made of old wine and Finns will very often mix in some wine or spirits. In restaurants, glögi is served either alcohol-free, or with 2cl vodka added. Fresh, hot glögi can, for example, be found at the Helsinki Christmas market.
Liqueurs in Finland
Quite a few unusual liquors (likööri) made from berries are available, although they're uniformly very sweet and usually served with dessert. Cloudberry liquor (lakkalikööri) is worth a short even if you don't like the berries fresh as well as mesimarja (arctic bramble), and polar karpolo (Arctic cranberry).
Sima & Sahti in Finland
Finally, two traditional beverages worth looking for are mead (sima), an age-old wine-like brew made from brown sugar, lemon and yeast and consumed particularly around May's Vappu festival, and sahti, a type of unfiltered, usually very strong beer often flavored with juniper berries (an acquired taste).
http://wikitravel.org/en/Finland#Drink