See BOXED WARNINGS, WARNINGS and PRECAUTIONS.

Because clinical trials are conducted under widely varying conditions, adverse event rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice.

EstroGel (estradiol gel) 1.25 g was studied in 2 well-controlled 12-week clinical trials. Incidence of adverse events ≥ 5 percent for 1.25 g EstroGel (estradiol gel) and placebo is given below in Table 4.

TABLE 4: Incidence of Treatment-emergent Signs and Symptoms ≥ 5 Percent By COSTART Body System and by Descending Frequency of Occurrence in the EstroGel (estradiol gel) Treatment Group for the Intent-to-Treat Safety Population in 2 Well-controlled Clinical Studies (Expressed as Percent of Treatment Group)

The following additional adverse events have been reported with estrogen and/or progestin therapy.

1. Genitourinary system: abnormal uterine bleeding/spotting; dysmenorrhea/pelvic pain; increase in size of uterine leiomyomata; vaginitis including vaginal candidiasis; change in amount of cervical secretion; changes in cervical ectropion; ovarian cancer; endometrial hyperplasia; endometrial cancer
2. Breasts: tenderness; enlargement; pain; nipple discharge; galactorrhea; fibrocystic breast changes; breast cancer
3. Cardiovascular: deep and superficial venous thrombosis; pulmonary embolism; thrombophlebitis; myocardial infarction; stroke; increase in blood pressure
4. Gastrointestinal: nausea; vomiting, abdominal cramps; bloating; cholestatic jaundice; increased incidence of gallbladder disease; pancreatitis; enlargement of hepatic hemangiomas
5. Skin: chloasma or melasma, that may persist when drug is discontinued; erythema multiforme; erythema nodosum; hemorrhagic eruption; loss of scalp hair; hirsutism; pruritus; rash
6. Eyes: retinal vascular thrombosis; intolerance to contact lenses
7. Central nervous system: headache; migraine; dizziness; mental depression; exacerbation of chorea; nervousness; mood disturbances; irritability; exacerbation of epilepsy; dementia
8. Miscellaneous: increase or decrease in weight; glucose intolerance; aggravation of porphyria; edema; arthralgias; leg cramps; changes in libido; urticaria; angioedema; anaphylactoid/anaphylactic reactions; hypocalcemia (preexisting condition); exacerbation of asthma; increased triglycerides

Read the EstroGel (estradiol gel) Side Effects Center for a complete guide to possible side effects »

1. Accelerated prothrombin time, partial thromboplastin time, and platelet aggregation time; increased platelet count; increased factors II, VII antigen, VIII antigen, VIII coagulant activity, IX, X, XII, VII-X complex, II-VII-X complex, and beta-thromboglobulin; decreased levels of anti-factor Xa and antithrombin III, decreased antithrombin III activity; increased levels of fibrinogen and fibrinogen activity; increased plasminogen antigen and activity.
2. Increased thyroid-binding globulin (TBG) leading to increased circulating total thyroid hormone levels, as measured by protein-bound iodine (PBI), T₄ levels (by column or by radioimmunoassay) or T₃ levels by radioimmunoassay. T₃ resin uptake is decreased, reflecting the elevated TBG. Free T₄ and T₃ concentrations are unaltered. Patients on thyroid-replacement therapy may require higher doses of thyroid hormone.
3. Other binding proteins may be elevated in serum (Corticosteroid-binding globulin [CBG], sex hormone-binding globulin [SHBG]), leading to increased total circulating corticosteroids and sex steroids, respectively. Free hormone concentrations may be decreased. Other plasma proteins may be increased (angiotensinogen/renin substrate, alpha-1-antitrypsin, ceruloplasmin).
4. Increased plasma HDL and HDL2 cholesterol subfraction concentrations, reduced LDL cholesterol concentration, increased triglyceride levels.
5. Impaired glucose tolerance.

Last reviewed on RxList: 2/12/2008
This monograph has been modified to include the generic and brand name in many instances.