Roger Samuelsson is a new billionaire thanks to big pharma's demand for his company's injectors. : The runaway success of weight loss drugs took the markets by storm last year, spurring huge stock gains for drugmakers like Novo Nordisk, which makes Wegovy and Ozempic. Most patients take them at home in weekly injections, using plastic, pen-like devices known as autoinjectors, filled with the liquid medication and fitted with a tiny needle as wide as two human hairs. As demand for the drugs soars, so does the need for those devices.