In such cases, surgery may alleviate the problem. However, many Fallopian tubes are blocked by a condition called endometriosis. Endometriosis is a painful condition in which tissue from the lining of the uterus is found in other parts of the abdominal cavity. The strayed tissue grows, causing much pain and any number of other problems, including blocked tubes. In addition to creating a pseudo-menopause condition, the drug causes the endometrial tissue to atrophy and die.
Treatment usually lasts six to nine months.
Pregnancy, if desired, follows in about 50 percent of the cases. Drugs are often used successfully for inducing ovulation. However, they may have a major side effect - multiple births. Lack of ovulation or infrequent and irregular ovulations may be a cause of up to half of female infertility problems. Drug therapy can result in pregnancy in about 25 percent of those cases.