Just be aware of the caustic affects drain cleaners can have.
When we bought our home, the previous owners used something caustic in all the drains. All the chrome was eaten off the sink drains down to the brass. We had to replace all the drains.
I don't know what they used, but (IMO) you are much better off trying a snake drain opener first along with very hot water to clear the drain. If that doesn't work, then call a plumber...just my experience with the subject....Good luck ...