Prasopsuk, K. ., S. . Prasopsuk, and S. Tunruttanakul. “Evaluation of Hypotensive Prevention Effect of Intramuscular Glycopyrrolate in Spinal Anesthesia of Elderly TURP Patients: A Randomized Control Trial”. Siriraj Medical Journal, vol. 72, no. 5, May 2020, pp. 380-6, doi:10.33192/Smj.2020.51.