1. Ajmera SK Shah PK Shinde GA Comparative study of drotaverine vs. Valethamate in cervical phase of labour Bombay Hospital Journal (http://www.bhj.org/journal/2006_4802_april/html/org_res_305-309.html)
2. Al Matari F Is buscopan (hyoscine-N-butylbromide) effective in shortening labor? [abstract] 31st British International Congress of Obstetrics and Gynaecology; 2007 July 4-6; London, UK 2007 114
3. The effect of hyoscine butylbromide in shortening the first stage of labor: A double blind, randomized controlled trial;Al Qahtani;Therapeutics and Clinical Risk Management,2011
4. The effect of combination atropine and hyoscine progress of delivery in primiparous women in Ardabil - Alavi Hospital 2008;Azari;Journal of Maternal-Fetal and Neonatal Medicine,2010
5. Effect of valethamate bromide in acceleration of labor: a double-blind, placebo-controlled trial;Batukan;Journal of the Turkish German Gynecology Association Artemis,2006