My chihuahua accidentally ate Dramamine!?

I have bad car sickness so I like to keep some Dramamine in my purse in case of emergencies. My purse fell over and the medicine capsule for my Dramamine opened somehow and I didn't notice it, so my chihuahua Daisy went over and ate one of the tablets. Is it going to hurt her because she's a chihuahua? The Dramamine is 25 mg.