Hyperemesis gravidarum is a debilitating illness that impacts some people during pregnancy, yet the drug used to treat it is still difficult to access. Why? We're joined by our Political Correspondent Christina Finn to look at the issue further - just how effective is Cariban, how expensive is it, and why isn't the scheme the government set up to pay for it working as it should?The Explainer is brought to you by The Journal. Providing open access to valuable journalism in Ireland has been the aim of The Journal for a decade. You can contribute to ensure we can keep questioning, investigating, debunking, explaining and informing at www.thejournal.ie/contribute/