If pharmaceutical drug patents are an hourglass turned over on the day of approval – with the approaching loss of exclusivity known in the industry as the “patent cliff” – then Big Pharma is currently watching the final grains of sand slipping through the neck of the glass.At the bottom of the hourglass awaits an unforgiving world of generic and biosimilar competition. Between 2025 and 2030, the patent cliff is set to be one of the biggest since 2010 by revenue at risk, according to...