1: Rai RR, Dwivedi M, Kumar N. Efficacy and safety of drotaverine hydrochloride in irritable bowel syndrome: a randomized double-blind placebo-controlled study. Saudi J Gastroenterol. 2014 Nov-Dec;20(6):378-82. doi: 10.4103/1319-3767.145331. 2: Narang M, Shah D, Akhtar H. Efficacy and Safety of Drotaverine Hydrochloride in Children with Recurrent Abdominal Pain: A Randomized Placebo Controlled Trial. Indian Pediatr. 2015 Oct 9;52(10):847-51. doi: 10.1007/s00284-014-0718-1. Epub 2014 Nov 2. doi: 10.1155/2015/926953. Epub 2015 Jun 21. 5: Ibrahim MI, Alzeeniny HA, Ellaithy MI, Salama AH, Abdellatif MA. Drotaverine to improve progression of labor among nulliparous women. Int J Gynaecol Obstet. 2014 Feb;124(2):112-7. doi: 10.1016/j.ijgo.2013.08.013. Epub 2013 Nov 7. doi: 10.1007/s11274-012-1110-6. Epub 2012 Jun 23. doi: 10.1093/chromsci/bms026. Epub 2012 May 9. doi: 10.5740/jaoacint.12-475. doi: 10.1111/j.1526-4637.2011.01314.x. Epub 2012 Feb 1. English, Russian. doi: 10.1016/j.colsurfb.2010.09.005. Epub 2010 Sep 15. doi: 10.1007/s00404-009-1188-8. Epub 2009 Jul 31. doi: 10.4103/0250-474X.93520.