They're called drains for a reason - they're SUPPOSED to drain the water out. :) If yours isn't doing its job, here are some natural ways to get that drain draining again...
If the situation isn't too dire yet, you can simply pour about a cup of baking soda down the drain, followed by some boiling hot water. It'll get things moving nicely again and prevent a more serious clog.
Bubbly Baking Soda & Vinegar
It looks impressive and this solution really works. First pour a cup of baking soda down the drain, then follow with a cup of vinegar. Let it fizz for a bit - yes, you can ooh and ahh if you want to - then rinse the whole fizzy mess away with some really hot water.
This should help you from using those nasty chemical drain cleaners. You really don't need them in most cases. Hope this helps!