NCT01598012.

Trial name or title	The Efficacy of Ayurved Siriraj Prasaplai for Treatment Primary Dysmenorrhea
Methods	Block randomisation and double blinded
Participants	Inclusion: women diagnosed with primary dysmenorrhoea, with regular menstruation; has a numeric rating score for pain during menstruation (dysmenorrhoea) > 5 and continuous for 3 menstrual cycles, and want to participate in this study. Exclusion: women with allergy history to herbal or other components in Ayurved Siriraj Prasaplai drug; using hormonal contraception; has other diseases which cause abdominal pain; breast feeding Location: Thailand
Interventions	Group 1: Ayurved Siriraj Prasaplai with or without mefenamic acid. Prasaplai in capsule, 2 capsules 3 times a day for 3 days. Mefenamic acid 500 mg prn for severe pain (as rescue medication). Other name: Ponstan Group 2: Placebo with or without mefenamic acid. Placebo in a capsule (physically identical appearance to Prasaplai) 2 capsules 3 times a day for 3 days. Mefenamic acid (Ponstan) 500 mg prn for severe pain, every 6 hours (rescue medication)
Outcomes	Primary Pain score by using NRS. Secondary Adverse effects of Ayurved Siriraj Prasapla number of mefenamic acid for breaking pain.
Starting date	December 2011
Contact information	Thanyarat Wongwananuruk, Gynecologic Endocrinology Unit, Department of Obstetric and Gynecology, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok, Thailand, 10700
Notes	Data collection has finished. As of November 2014 the study authors are writing up their results. Not published at February 2016.

prn: as needed

qd: every day / daily

OCP: oral contraceptive pills