Cervical Lidocaine-Prilocaine Cream vs Glyceryl Trinitrate Cream in Nulliparous Women With LNG-IUD Insertion

2 mL of the Lidocaine-Prilocaine cream will be placed on the anterior lip of the cervix by a Q-tip applicator, followed by 2 mL will be introduced in the cervical canal 7 minutes prior to IUD insertion

2 mL of the glyceryl trinitrate cream will be placed on the anterior lip of the cervix by a Q-tip applicator, followed by 2 mL will be introduced in the cervical canal 7 minutes prior to IUD insertion

2 mL of the placebo cream will be placed on the anterior lip of the cervix by a Q-tip applicator, followed by 2 mL will be introduced in the cervical canal 7 minutes prior to IUD insertion