A nerve block relieves pain by interrupting how pain signals are sent to your brain. It is done by injecting a substance, such as alcohol or phenol, into or around a nerve or into the spine. Nerve blocks may be used for several purposes, such as: 1  To determine the source of pain.
2.5 Stars. Lo Loestrin Fe is the brand name for norethindrone acetate and ethinyl estradiol, a prescription birth control medicine that's used to prevent pregnancy. The drug contains female hormones that prevent ovulation and also causes changes in the cervical mucus and uterine lining, which makes it harder for sperm to reach the uterus and for a fertilized egg to attach to the uterus.
You may need to use a backup method of birth control, such as condoms or spermicide, when you first start using Lo Loestrin Fe or if you miss a dose of the drug.Missing a pill can increase your risk of becoming pregnant.ou should stop using Lo Loestrin Fe and call your doctor if you experience serious side effects such as: 1  Sudden and severe headache. 2  Sudden confusion. 3  Chest pain or heavy feeling, pain spreading to the arm or shoulder.