Can I cut a Zofran 8mg hcl pill in half?

Not sure if this is the right place to ask this. If not could someone maybe direct me to what the correct place would be? If it is then it's as the title says. I've been struggling with constant nausea for a while but Zofran has been helping me function enough to go to work and classes. I was on 4 mgs odt and that was working just fine but when I asked my Dr for a refill she gave me a bottle of the 8 mg hcl pills. I don't really want to take the full 8 as I am doing fine on the 4 and don't wanna deal with the constipation so I'm just wondering if it's safe to cut it in half and take it?