Drain cleaner is noted as being one of the most toxic items found in the home. Traditional drain cleaners are full of chemicals that can burn your skin and eyes, not to mention the fumes your lungs are being exposed to.
Try a better solution:
Pour 1/2 cup baking soda into your drain. Pour 1/2 cup white vinegar over the baking soda. Allow it to sit for a half hour. Rinse with a couple of quarts of boiling water.
NOTE: I’ve used this solution, and it seems to work better as a preventative solution, not a fast cure. Once your drain is clogged badly, you may need something stronger, or you might have to pay for a plumber. Also, it helps if you first unscrew the plug, and remove any visible hair. The baking soda and vinegar will bubble up and dislodge some items, but not all. Try using this idea as a weekly cleaning routine for best results.
As with most home care items, prevention is better than fighting a full blown problem, like a completely stopped up drain.