Sentence:  A randomized controlled clinical trial (N = 187) using an <WSD>intranasal</WSD> morphine-chitosan formulation (Rylomine) postoperatively following bunionectomy in 187 opioid-naïve patients demonstrated that the <WSD>intranasal</WSD> analgesic was comparable to IV morphine for both pain relief and systemic adverse effects. 
Meaning of the word marked with <WSD> tags:  Taken through the nose.