What would happen if a dog ate citalopram?

Funnily enough my friends pom ate 30mg of citalopram this morning. We took her to the vets and they tried to make her sick but they couldn't so they sent her home for us to watch her. She's been a bit docile and has been sick on her own accord but other than that she seems perfectly normal. I would say that in general dogs will be fine unless they eat an excessive amount. The vets cost us £30 for nothing!!!.