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OBJECTIVE	The purpose of this study is the comparison of the effect of vitamin B1 and fish oil with together on severity and duration of dysmenorrhea , and if it is effective , we can administrative both of them with less complication to compare with other chemical drugs which has many disadvantages .
METHODS	High school of Urmia city , between March 2008 and June 2008 .
METHODS	This study has a double-blind clinical trial design .240 high school female students with dysmenorrhea by a randomized Method were followed up in a double-blind , randomized , placebo-controlled study by dividing into four groups with 60 members .
METHODS	The daily supplement was vit B1 ( 100 mg/day and fish oil pearl 500 mg/day ) , taken as a single dose starting at the beginning of the menstrual cycle and continued for 2 consecutive months .
RESULTS	Intensity of pain in three experimental groups ( Vit B1 , fish oil and both of them ) had significant difference comparing placebo group and intensity of pain had reduced .
RESULTS	( p < 0.001 ) , ( p = 0.018 ) , ( p < 0.001 ) VS in placebo group ( p = 0.79 ) .
RESULTS	Duration of pain had significantly reduced in all three experimental groups compared with placebo group .
RESULTS	( p = 0.004 ) , ( p = 0.008 ) , ( p < 0.001 ) VS in placebo group ( p = 0.32 ) .
RESULTS	In all of drugs , results ( mean ) was better at the end of the second month than the first month .
CONCLUSIONS	Fish oil and vit B1 effects on treatment of primary dysmenorrhea were similar , but vit B1 has less complications and it was more acceptable .
CONCLUSIONS	We mixed them and compared its results with vit B1 , fish oil and placebo separately .
CONCLUSIONS	Pain duration is the least in Vitamin B1 tablets compare with the others , but its duration was minimum in complex of Vitamin B1 tablets and fish oil capsules .
CONCLUSIONS	Due to good effects of vitamin B1 and fish oil on symptoms of dysmenorrhea , using of them is suggested .

