In 2015, the Korean Supreme Court cleared the patent eligibility hurdle for dosage regimen inventions, and announced that dosage regimens are patentable if they satisfy other patentability requirements including novelty and inventiveness (Supreme Court en banc decision 2014Hu768, May 21 2015). In the first case where the inventiveness of a dosage invention was at issue (Patent Court decision 2015Heo7889, February 3 2017), the Korean Patent Court denied inventiveness on the ground that optimising dosage regimens to achieve the reduction of toxicity or improvement of efficacy is considered routine experimentation or work of a person having ordinary skill in the art (PHOSITA). This shows that Korea has a strict standard for the inventiveness of dosage regimen patents.