the Effect of Vitamin B 1 on Menstrual Pattern After Insertion of the IUD.

This study will be randomized controlled trial will be performed at the Obstetric and Gynecological Department at Beni-Suef University Hospital, Faculty of Medicine Target Population: All females with first time use of IUD inserted at the Obstetrics and Gynecology department through 3 months from the start of July 2023 till the end of November 2023.

Participants will be assigned in a 1:1 ratio to the use of vitamin B 1 or placebo, in accordance with a random table produced by an Excel program, with A being assigned to the intervention group and B to the control group. All women will sign a written informed consent prior to data collection.

Each woman within the intervention group will receive a packet containing 30 pills (vitamin B 1 or placebo), each month for three months.

• VITAMIN B1 500mg (Drug), also known as VITAMIN B1 500mg @Biovea: VITAMIN B1 (High Potency) 500mg tab every day for 3 months
• intra-uterine contraceptive device (Device), also known as silverline IUD: intra-uterine contraceptive device

Primary outcomes

• the duration of menstrual bleeding. [3 cycles ( 3 months / one month for each cycle)]: days of menstruation

Sex: Female, ages: 20 Years to 40 Years

Inclusion Criteria:

* Females with first time use of the IUD
* a history of normal menstrual bleeding with duration of 3 to 7 days without spotting, a menstrual cycle lasting 23 to 35 days,
* use of 10 to 14 sanitary pads per cycle before IUD insertion
* gravidity ranging between 1 and 4.

Exclusion Criteria:

* Patients with cardiac, hepatic or renal diseases.
* Patients with bleeding disorders.
* Patients with systemic diseases.