pharmaceutics Article Enhanced Bioavailability of Tadalafil after Intranasal Administration in Beagle Dogs Jeong-Soo Kim 1, Min-Soo Kim 2,* and In-hwan Baek 3,* 1 Dong-A ST Co. Ltd., Giheung-gu, Yongin, Gyeonggi 446-905, Korea; ttung2nd@gmail.com 2 College of Pharmacy, Pusan National ...