When I first started taking it it made me drowsy. The tablets I use have a line for splitting. Something I take half of one. You might try this
I started with one pill, but it didn't make me dizzy - just relaxed the muscles. I already had bad vertigo. (Lasted for three years, from 2006 until 2009.)
They usually start you off with one pill at a time, then titrate up to 2, then 3, and so on. They want you to stop titrating up when your spasticity and spasms are manageable.