(Reuters) — BioDelivery Sciences International said the FDA approved its opioid cheek patch for chronic pain, sending the drugmaker’s shares up 23% in premarket trading today. Endo International (NSDQ:ENDP) licensed the worldwide manufacturing and marketing rights to the treatment, Belbuca, from BioDelivery in 2012. Belbuca is an opioid film patch and aims to treat patients with […]