[1] Harlow SD, Park M. A longitudinal study of risk factors for the occurrence, duration and severity of menstrual cramps in a cohort of college women. Br J Obstet Gynecol. 1996; 104(3): 1134-1142.
[2] Ryan SA. The treatment of dysmenorrhea. Pediatr Clin North Am. 2017; 64(2): 331-342.
[3] Tangyuenyongwatana P, Gritsanapan W. A study on artifacts formation in the Thai traditional medicine Prasaplai. Planta Med. 2008; 74(11): 1403-1405.
[4] Waltenberger B, Schuster D, Paramapojn S, Gritsanapan W, Wolber G, Rollinger JM, Stuppner H. Predicting cyclooxygenase inhibition by three-dimensional pharmacophoric profiling. Part II: Identification of enzyme inhibitors from Prasaplai, a Thai traditional medicine. Phytomed. 2011; 18(2): 119-133.
[5] National Drug Committee. National list of essential medicinesA.D. 2013 (List of herbal medicinal products). Bangkok: Chumnum sahakorn karnkaset of Thailand Press Ltd, 2013.
[6] Nualkaew S, Gritsanapan W, Petereit F, Nahrstedt A. New fatty acid esters originate during storage by the interaction of components in Prasaplai, a Thai traditional medicine. Planta Med. 2004; 70(2): 1243-1246.
[7] Paramapojn S. Standardization and biological activities of Prasaplai, a Thai traditional medicine. Ph.D. thesis. Faculty of Graduate Studies, Mahidol University, Bangkok, Thailand, 2008.
[8] Tangyuenyongwatana P, Gritsanapan W. Prasaplai: an essential Thai traditional formulation for primary dysmenorrhea treatment. Tang. 2014; 4(2): 1-8.
[9] Gagnier JJ, Boon H, Rochon P, Moher D, Barnes J, Bombardier C. Recommendations for reporting randomized controlled trials of herbal interventions: explanation and elaboration. J Clin Epidemiol. 2006; 59(11): 1134-1149.
[10] Jadad AR, Moore RA, Carroll D, Jenkinson C, Reynolds DJ, Gavaghan DJ, McQuay HJ. Assessing the quality of reports of randomized clinical trials: Is blinding necessary? Control Clin Trials. 1996; 17(1): 1-12.
[11] Higgins JP, Altman DG, Gøtzsche PC, Jüni P, Moher D, Oxman AD, Savovic J, Schulz KF, Weeks L, Sterne JA. The Cochrane Collaboration’s tool for assessing risk of bias in randomised trials. Br Med J. 2011; Article ID 22008217.
[12] Sahebkar A. Are curcuminoids effective C-reactive protein-lowering agents in clinical practice? Evidence from a meta-analysis. Phytother Res. 2014; 28(5): 633-642.
[13] Chakchai K. Formulation and satisfaction assessment of Prasaplai in primary dysmenorrhea patient at primary care center, Mahasarakham University. PharmD. thesis. Mahasarakham University, Maha Sarakham, Thailand, 2008.
[14] Kamalashiran C, Lekskulchai O. The comparative study of the efficacy and side effect of Prasaplai extract versus mefenamic acid on relieving primary dysmenorrhea: a clinical phase II trials. Thammasat Med J. 2012; 12(4): 749-756.
[15] Sasum S. Formulation and clinical efficacy of Prasaplai extract capsules in women with primary dysmenorrheal. PharmD. thesis. Mahasarakham University, Maha Sarakham, Thailand, 2010.
[16] Sriyakul K, Kietinun S, Pattaraarchachai J, Ruangrungsi N. A Comparative double-blinded randomized study: the efficacy of Prasaplai herbal extract versus mefenamic acid in relieving pain among primary dysmenorrhea patients. Open Complement Med J. 2012; 6(4): 16-21.
[17] Higgins J, Green SE. Cochrane handbook for systematic reviews of interventions version 5.1.0. The Cochrane Collaboration 2016. [Accessed 2016]. Available from: http://www.handbook.cochrane.org.
[18] Nualkaew S, Tiangda C, Gritsanapan W. Inhibitory action on rat uterine muscle contraction in vitro and acute toxicity in rats of the Thai traditional preparation Prasaplai. Nat Prod Res. 2013; 27(4): 491-495.
[19] Kanjanapothi D, Soparat P, Panthong A, Tuntiwachwuttikul P, Reutrakul V. A uterine relaxant compound from Zingiber cassumunar. Planta Med. 1987; 53(4): 329-332.
[20] Rangsimantuchat S, Dhumma-upakorn P, Jianmongkol S. Antispasmodic effects of alcoholic extracts from polyherbal formulation “Prasaplai” on isolated rat uterine horn. Thai J Pharmacol. 2010; 32(1): 192-195.
[21] Tangyuenyongwatana P, Kowapradit J, Opanasopit P, Gritsanapan W. Cellular transport of anti-inflammatory pro-drugs originated from a herbal formulation of Zingiber cassumunar and Nigella sativa. Chin Med. 2009; 4: 1-5.
[22] Essential Medicines and Health Products Information Portal A World Health Organization resource 1996. [Accessed 2016]. Available from: http://apps.who.int/medicinedocs/en/d/Js2200e/.